text_tests.lua

   1 -- major tests for text editing flows
   2 -- Arguably this should be called edit_tests.lua,
   3 -- but that would mess up the git blame at this point.
   4
   5 function test_initial_state()
   6   App.screen.init{width=120, height=60}
   7   Editor_state = edit.initialize_test_state()
   8   Editor_state.lines = load_array{}
   9   Text.redraw_all(Editor_state)
  10   edit.draw(Editor_state)
  11   check_eq(#Editor_state.lines, 1, '#lines')
  12   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
  13   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
  14   check_eq(Editor_state.screen_top1.line, 1, 'screen_top:line')
  15   check_eq(Editor_state.screen_top1.pos, 1, 'screen_top:pos')
  16 end
  17
  18 function test_backspace_from_start_of_final_line()
  19   -- display final line of text with cursor at start of it
  20   App.screen.init{width=120, height=60}
  21   Editor_state = edit.initialize_test_state()
  22   Editor_state.lines = load_array{'abc', 'def'}
  23   Editor_state.screen_top1 = {line=2, pos=1}
  24   Editor_state.cursor1 = {line=2, pos=1}
  25   Text.redraw_all(Editor_state)
  26   -- backspace scrolls up
  27   edit.run_after_keychord(Editor_state, 'backspace', 'backspace')
  28   check_eq(#Editor_state.lines, 1, '#lines')
  29   check_eq(Editor_state.cursor1.line, 1, 'cursor')
  30   check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
  31 end
  32
  33 function test_insert_first_character()
  34   App.screen.init{width=120, height=60}
  35   Editor_state = edit.initialize_test_state()
  36   Editor_state.lines = load_array{}
  37   Text.redraw_all(Editor_state)
  38   edit.draw(Editor_state)
  39   edit.run_after_text_input(Editor_state, 'a')
  40   local y = Editor_state.top
  41   App.screen.check(y, 'a', 'screen:1')
  42 end
  43
  44 function test_press_ctrl()
  45   -- press ctrl while the cursor is on text
  46   App.screen.init{width=50, height=80}
  47   Editor_state = edit.initialize_test_state()
  48   Editor_state.lines = load_array{''}
  49   Text.redraw_all(Editor_state)
  50   Editor_state.cursor1 = {line=1, pos=1}
  51   Editor_state.screen_top1 = {line=1, pos=1}
  52   edit.run_after_keychord(Editor_state, 'C-m', 'm')
  53 end
  54
  55 function test_move_left()
  56   App.screen.init{width=120, height=60}
  57   Editor_state = edit.initialize_test_state()
  58   Editor_state.lines = load_array{'a'}
  59   Text.redraw_all(Editor_state)
  60   Editor_state.cursor1 = {line=1, pos=2}
  61   edit.draw(Editor_state)
  62   edit.run_after_keychord(Editor_state, 'left', 'left')
  63   check_eq(Editor_state.cursor1.pos, 1, 'check')
  64 end
  65
  66 function test_move_right()
  67   App.screen.init{width=120, height=60}
  68   Editor_state = edit.initialize_test_state()
  69   Editor_state.lines = load_array{'a'}
  70   Text.redraw_all(Editor_state)
  71   Editor_state.cursor1 = {line=1, pos=1}
  72   edit.draw(Editor_state)
  73   edit.run_after_keychord(Editor_state, 'right', 'right')
  74   check_eq(Editor_state.cursor1.pos, 2, 'check')
  75 end
  76
  77 function test_move_left_to_previous_line()
  78   App.screen.init{width=120, height=60}
  79   Editor_state = edit.initialize_test_state()
  80   Editor_state.lines = load_array{'abc', 'def'}
  81   Text.redraw_all(Editor_state)
  82   Editor_state.cursor1 = {line=2, pos=1}
  83   edit.draw(Editor_state)
  84   edit.run_after_keychord(Editor_state, 'left', 'left')
  85   check_eq(Editor_state.cursor1.line, 1, 'line')
  86   check_eq(Editor_state.cursor1.pos, 4, 'pos')  -- past end of line
  87 end
  88
  89 function test_move_right_to_next_line()
  90   App.screen.init{width=120, height=60}
  91   Editor_state = edit.initialize_test_state()
  92   Editor_state.lines = load_array{'abc', 'def'}
  93   Text.redraw_all(Editor_state)
  94   Editor_state.cursor1 = {line=1, pos=4}  -- past end of line
  95   edit.draw(Editor_state)
  96   edit.run_after_keychord(Editor_state, 'right', 'right')
  97   check_eq(Editor_state.cursor1.line, 2, 'line')
  98   check_eq(Editor_state.cursor1.pos, 1, 'pos')
  99 end
 100
 101 function test_move_to_start_of_word()
 102   App.screen.init{width=120, height=60}
 103   Editor_state = edit.initialize_test_state()
 104   Editor_state.lines = load_array{'abc'}
 105   Text.redraw_all(Editor_state)
 106   Editor_state.cursor1 = {line=1, pos=3}
 107   edit.draw(Editor_state)
 108   edit.run_after_keychord(Editor_state, 'M-left', 'left')
 109   check_eq(Editor_state.cursor1.pos, 1, 'check')
 110 end
 111
 112 function test_move_to_start_of_previous_word()
 113   App.screen.init{width=120, height=60}
 114   Editor_state = edit.initialize_test_state()
 115   Editor_state.lines = load_array{'abc def'}
 116   Text.redraw_all(Editor_state)
 117   Editor_state.cursor1 = {line=1, pos=4}  -- at the space between words
 118   edit.draw(Editor_state)
 119   edit.run_after_keychord(Editor_state, 'M-left', 'left')
 120   check_eq(Editor_state.cursor1.pos, 1, 'check')
 121 end
 122
 123 function test_skip_to_previous_word()
 124   App.screen.init{width=120, height=60}
 125   Editor_state = edit.initialize_test_state()
 126   Editor_state.lines = load_array{'abc def'}
 127   Text.redraw_all(Editor_state)
 128   Editor_state.cursor1 = {line=1, pos=5}  -- at the start of second word
 129   edit.draw(Editor_state)
 130   edit.run_after_keychord(Editor_state, 'M-left', 'left')
 131   check_eq(Editor_state.cursor1.pos, 1, 'check')
 132 end
 133
 134 function test_skip_past_tab_to_previous_word()
 135   App.screen.init{width=120, height=60}
 136   Editor_state = edit.initialize_test_state()
 137   Editor_state.lines = load_array{'abc def\tghi'}
 138   Text.redraw_all(Editor_state)
 139   Editor_state.cursor1 = {line=1, pos=10}  -- within third word
 140   edit.draw(Editor_state)
 141   edit.run_after_keychord(Editor_state, 'M-left', 'left')
 142   check_eq(Editor_state.cursor1.pos, 9, 'check')
 143 end
 144
 145 function test_skip_multiple_spaces_to_previous_word()
 146   App.screen.init{width=120, height=60}
 147   Editor_state = edit.initialize_test_state()
 148   Editor_state.lines = load_array{'abc  def'}
 149   Text.redraw_all(Editor_state)
 150   Editor_state.cursor1 = {line=1, pos=6}  -- at the start of second word
 151   edit.draw(Editor_state)
 152   edit.run_after_keychord(Editor_state, 'M-left', 'left')
 153   check_eq(Editor_state.cursor1.pos, 1, 'check')
 154 end
 155
 156 function test_move_to_start_of_word_on_previous_line()
 157   App.screen.init{width=120, height=60}
 158   Editor_state = edit.initialize_test_state()
 159   Editor_state.lines = load_array{'abc def', 'ghi'}
 160   Text.redraw_all(Editor_state)
 161   Editor_state.cursor1 = {line=2, pos=1}
 162   edit.draw(Editor_state)
 163   edit.run_after_keychord(Editor_state, 'M-left', 'left')
 164   check_eq(Editor_state.cursor1.line, 1, 'line')
 165   check_eq(Editor_state.cursor1.pos, 5, 'pos')
 166 end
 167
 168 function test_move_past_end_of_word()
 169   App.screen.init{width=120, height=60}
 170   Editor_state = edit.initialize_test_state()
 171   Editor_state.lines = load_array{'abc def'}
 172   Text.redraw_all(Editor_state)
 173   Editor_state.cursor1 = {line=1, pos=1}
 174   edit.draw(Editor_state)
 175   edit.run_after_keychord(Editor_state, 'M-right', 'right')
 176   check_eq(Editor_state.cursor1.pos, 4, 'check')
 177 end
 178
 179 function test_skip_to_next_word()
 180   App.screen.init{width=120, height=60}
 181   Editor_state = edit.initialize_test_state()
 182   Editor_state.lines = load_array{'abc def'}
 183   Text.redraw_all(Editor_state)
 184   Editor_state.cursor1 = {line=1, pos=4}  -- at the space between words
 185   edit.draw(Editor_state)
 186   edit.run_after_keychord(Editor_state, 'M-right', 'right')
 187   check_eq(Editor_state.cursor1.pos, 8, 'check')
 188 end
 189
 190 function test_skip_past_tab_to_next_word()
 191   App.screen.init{width=120, height=60}
 192   Editor_state = edit.initialize_test_state()
 193   Editor_state.lines = load_array{'abc\tdef'}
 194   Text.redraw_all(Editor_state)
 195   Editor_state.cursor1 = {line=1, pos=1}  -- at the space between words
 196   edit.draw(Editor_state)
 197   edit.run_after_keychord(Editor_state, 'M-right', 'right')
 198   check_eq(Editor_state.cursor1.pos, 4, 'check')
 199 end
 200
 201 function test_skip_multiple_spaces_to_next_word()
 202   App.screen.init{width=120, height=60}
 203   Editor_state = edit.initialize_test_state()
 204   Editor_state.lines = load_array{'abc  def'}
 205   Text.redraw_all(Editor_state)
 206   Editor_state.cursor1 = {line=1, pos=4}  -- at the start of second word
 207   edit.draw(Editor_state)
 208   edit.run_after_keychord(Editor_state, 'M-right', 'right')
 209   check_eq(Editor_state.cursor1.pos, 9, 'check')
 210 end
 211
 212 function test_move_past_end_of_word_on_next_line()
 213   App.screen.init{width=120, height=60}
 214   Editor_state = edit.initialize_test_state()
 215   Editor_state.lines = load_array{'abc def', 'ghi'}
 216   Text.redraw_all(Editor_state)
 217   Editor_state.cursor1 = {line=1, pos=8}
 218   edit.draw(Editor_state)
 219   edit.run_after_keychord(Editor_state, 'M-right', 'right')
 220   check_eq(Editor_state.cursor1.line, 2, 'line')
 221   check_eq(Editor_state.cursor1.pos, 4, 'pos')
 222 end
 223
 224 function test_click_moves_cursor()
 225   App.screen.init{width=50, height=60}
 226   Editor_state = edit.initialize_test_state()
 227   Editor_state.lines = load_array{'abc', 'def', 'xyz'}
 228   Text.redraw_all(Editor_state)
 229   Editor_state.cursor1 = {line=1, pos=1}
 230   Editor_state.screen_top1 = {line=1, pos=1}
 231   Editor_state.selection1 = {}
 232   edit.draw(Editor_state)  -- populate line_cache.startpos for each line
 233   edit.run_after_mouse_release(Editor_state, Editor_state.left+8,Editor_state.top+5, 1)
 234   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
 235   check_eq(Editor_state.cursor1.pos, 2, 'cursor:pos')
 236   -- selection is empty to avoid perturbing future edits
 237   check_nil(Editor_state.selection1.line, 'selection:line')
 238   check_nil(Editor_state.selection1.pos, 'selection:pos')
 239 end
 240
 241 function test_click_to_left_of_line()
 242   -- display a line with the cursor in the middle
 243   App.screen.init{width=50, height=80}
 244   Editor_state = edit.initialize_test_state()
 245   Editor_state.lines = load_array{'abc'}
 246   Text.redraw_all(Editor_state)
 247   Editor_state.cursor1 = {line=1, pos=3}
 248   Editor_state.screen_top1 = {line=1, pos=1}
 249   Editor_state.selection1 = {}
 250   -- click to the left of the line
 251   edit.draw(Editor_state)
 252   edit.run_after_mouse_click(Editor_state, Editor_state.left-4,Editor_state.top+5, 1)
 253   -- cursor moves to start of line
 254   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
 255   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
 256   check_nil(Editor_state.selection1.line, 'selection is empty to avoid perturbing future edits')
 257 end
 258
 259 function test_click_takes_margins_into_account()
 260   -- display two lines with cursor on one of them
 261   App.screen.init{width=100, height=80}
 262   Editor_state = edit.initialize_test_state()
 263   Editor_state.left = 50  -- occupy only right side of screen
 264   Editor_state.lines = load_array{'abc', 'def'}
 265   Text.redraw_all(Editor_state)
 266   Editor_state.cursor1 = {line=2, pos=1}
 267   Editor_state.screen_top1 = {line=1, pos=1}
 268   Editor_state.selection1 = {}
 269   -- click on the other line
 270   edit.draw(Editor_state)
 271   edit.run_after_mouse_click(Editor_state, Editor_state.left+8,Editor_state.top+5, 1)
 272   -- cursor moves
 273   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
 274   check_eq(Editor_state.cursor1.pos, 2, 'cursor:pos')
 275   check_nil(Editor_state.selection1.line, 'selection is empty to avoid perturbing future edits')
 276 end
 277
 278 function test_click_on_empty_line()
 279   -- display two lines with the first one empty
 280   App.screen.init{width=50, height=80}
 281   Editor_state = edit.initialize_test_state()
 282   Editor_state.lines = load_array{'', 'def'}
 283   Text.redraw_all(Editor_state)
 284   Editor_state.cursor1 = {line=2, pos=1}
 285   Editor_state.screen_top1 = {line=1, pos=1}
 286   Editor_state.selection1 = {}
 287   -- click on the empty line
 288   edit.draw(Editor_state)
 289   edit.run_after_mouse_click(Editor_state, Editor_state.left+8,Editor_state.top+5, 1)
 290   -- cursor moves
 291   check_eq(Editor_state.cursor1.line, 1, 'cursor')
 292   -- selection remains empty
 293   check_nil(Editor_state.selection1.line, 'selection is empty to avoid perturbing future edits')
 294 end
 295
 296 function test_click_below_all_lines()
 297   -- display one line
 298   App.screen.init{width=50, height=80}
 299   Editor_state = edit.initialize_test_state()
 300   Editor_state.lines = load_array{'abc'}
 301   Text.redraw_all(Editor_state)
 302   Editor_state.cursor1 = {line=1, pos=1}
 303   Editor_state.screen_top1 = {line=1, pos=1}
 304   Editor_state.selection1 = {}
 305   -- click below first line
 306   edit.draw(Editor_state)
 307   edit.run_after_mouse_click(Editor_state, Editor_state.left+8,Editor_state.top+50, 1)
 308   -- cursor doesn't move
 309   check_eq(Editor_state.cursor1.line, 1, 'cursor')
 310   -- selection remains empty
 311   check_nil(Editor_state.selection1.line, 'selection is empty to avoid perturbing future edits')
 312 end
 313
 314 function test_draw_text()
 315   App.screen.init{width=120, height=60}
 316   Editor_state = edit.initialize_test_state()
 317   Editor_state.lines = load_array{'abc', 'def', 'ghi'}
 318   Text.redraw_all(Editor_state)
 319   Editor_state.cursor1 = {line=1, pos=1}
 320   Editor_state.screen_top1 = {line=1, pos=1}
 321   edit.draw(Editor_state)
 322   local y = Editor_state.top
 323   App.screen.check(y, 'abc', 'screen:1')
 324   y = y + Editor_state.line_height
 325   App.screen.check(y, 'def', 'screen:2')
 326   y = y + Editor_state.line_height
 327   App.screen.check(y, 'ghi', 'screen:3')
 328 end
 329
 330 function test_draw_wrapping_text()
 331   App.screen.init{width=50, height=60}
 332   Editor_state = edit.initialize_test_state()
 333   Editor_state.lines = load_array{'abc', 'defgh', 'xyz'}
 334   Text.redraw_all(Editor_state)
 335   Editor_state.cursor1 = {line=1, pos=1}
 336   Editor_state.screen_top1 = {line=1, pos=1}
 337   edit.draw(Editor_state)
 338   local y = Editor_state.top
 339   App.screen.check(y, 'abc', 'screen:1')
 340   y = y + Editor_state.line_height
 341   App.screen.check(y, 'de', 'screen:2')
 342   y = y + Editor_state.line_height
 343   App.screen.check(y, 'fgh', 'screen:3')
 344 end
 345
 346 function test_draw_word_wrapping_text()
 347   App.screen.init{width=60, height=60}
 348   Editor_state = edit.initialize_test_state()
 349   Editor_state.lines = load_array{'abc def ghi', 'jkl'}
 350   Text.redraw_all(Editor_state)
 351   Editor_state.cursor1 = {line=1, pos=1}
 352   Editor_state.screen_top1 = {line=1, pos=1}
 353   edit.draw(Editor_state)
 354   local y = Editor_state.top
 355   App.screen.check(y, 'abc ', 'screen:1')
 356   y = y + Editor_state.line_height
 357   App.screen.check(y, 'def ', 'screen:2')
 358   y = y + Editor_state.line_height
 359   App.screen.check(y, 'ghi', 'screen:3')
 360 end
 361
 362 function test_click_on_wrapping_line()
 363   -- display two screen lines with cursor on one of them
 364   App.screen.init{width=50, height=80}
 365   Editor_state = edit.initialize_test_state()
 366   Editor_state.lines = load_array{'abc def ghi jkl mno pqr stu'}
 367   Text.redraw_all(Editor_state)
 368   Editor_state.cursor1 = {line=1, pos=20}
 369   Editor_state.screen_top1 = {line=1, pos=1}
 370   -- click on the other line
 371   edit.draw(Editor_state)
 372   edit.run_after_mouse_click(Editor_state, Editor_state.left+8,Editor_state.top+5, 1)
 373   -- cursor moves
 374   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
 375   check_eq(Editor_state.cursor1.pos, 2, 'cursor:pos')
 376   check_nil(Editor_state.selection1.line, 'selection is empty to avoid perturbing future edits')
 377 end
 378
 379 function test_click_on_wrapping_line_takes_margins_into_account()
 380   -- display two screen lines with cursor on one of them
 381   App.screen.init{width=100, height=80}
 382   Editor_state = edit.initialize_test_state()
 383   Editor_state.left = 50  -- occupy only right side of screen
 384   Editor_state.lines = load_array{'abc def ghi jkl mno pqr stu'}
 385   Text.redraw_all(Editor_state)
 386   Editor_state.cursor1 = {line=1, pos=20}
 387   Editor_state.screen_top1 = {line=1, pos=1}
 388   -- click on the other line
 389   edit.draw(Editor_state)
 390   edit.run_after_mouse_click(Editor_state, Editor_state.left+8,Editor_state.top+5, 1)
 391   -- cursor moves
 392   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
 393   check_eq(Editor_state.cursor1.pos, 2, 'cursor:pos')
 394   check_nil(Editor_state.selection1.line, 'selection is empty to avoid perturbing future edits')
 395 end
 396
 397 function test_draw_text_wrapping_within_word()
 398   -- arrange a screen line that needs to be split within a word
 399   App.screen.init{width=60, height=60}
 400   Editor_state = edit.initialize_test_state()
 401   Editor_state.lines = load_array{'abcd e fghijk', 'xyz'}
 402   Text.redraw_all(Editor_state)
 403   Editor_state.cursor1 = {line=1, pos=1}
 404   Editor_state.screen_top1 = {line=1, pos=1}
 405   edit.draw(Editor_state)
 406   local y = Editor_state.top
 407   App.screen.check(y, 'abcd ', 'screen:1')
 408   y = y + Editor_state.line_height
 409   App.screen.check(y, 'e fgh', 'screen:2')
 410   y = y + Editor_state.line_height
 411   App.screen.check(y, 'ijk', 'screen:3')
 412 end
 413
 414 function test_draw_wrapping_text_containing_non_ascii()
 415   -- draw a long line containing non-ASCII
 416   App.screen.init{width=60, height=60}
 417   Editor_state = edit.initialize_test_state()
 418   Editor_state.lines = load_array{'madam I’m adam', 'xyz'}  -- notice the non-ASCII apostrophe
 419   Text.redraw_all(Editor_state)
 420   Editor_state.cursor1 = {line=1, pos=1}
 421   Editor_state.screen_top1 = {line=1, pos=1}
 422   edit.draw(Editor_state)
 423   local y = Editor_state.top
 424   App.screen.check(y, 'mad', 'screen:1')
 425   y = y + Editor_state.line_height
 426   App.screen.check(y, 'am I', 'screen:2')
 427   y = y + Editor_state.line_height
 428   App.screen.check(y, '’m a', 'screen:3')
 429 end
 430
 431 function test_click_past_end_of_screen_line()
 432   -- display a wrapping line
 433   App.screen.init{width=75, height=80}
 434   Editor_state = edit.initialize_test_state()
 435                                --  12345678901234
 436   Editor_state.lines = load_array{"madam I'm adam"}
 437   Text.redraw_all(Editor_state)
 438   Editor_state.cursor1 = {line=1, pos=1}
 439   Editor_state.screen_top1 = {line=1, pos=1}
 440   edit.draw(Editor_state)
 441   local y = Editor_state.top
 442   App.screen.check(y, 'madam ', 'baseline/screen:1')
 443   y = y + Editor_state.line_height
 444   App.screen.check(y, "I'm ad", 'baseline/screen:2')
 445   y = y + Editor_state.line_height
 446   -- click past end of second screen line
 447   edit.run_after_mouse_click(Editor_state, App.screen.width-2,y-2, 1)
 448   -- cursor moves to end of screen line (one more than final character shown)
 449   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
 450   check_eq(Editor_state.cursor1.pos, 13, 'cursor:pos')
 451 end
 452
 453 function test_click_on_wrapping_line_rendered_from_partway_at_top_of_screen()
 454   -- display a wrapping line from its second screen line
 455   App.screen.init{width=75, height=80}
 456   Editor_state = edit.initialize_test_state()
 457                                --  12345678901234
 458   Editor_state.lines = load_array{"madam I'm adam"}
 459   Text.redraw_all(Editor_state)
 460   Editor_state.cursor1 = {line=1, pos=8}
 461   Editor_state.screen_top1 = {line=1, pos=7}
 462   edit.draw(Editor_state)
 463   local y = Editor_state.top
 464   App.screen.check(y, "I'm ad", 'baseline/screen:2')
 465   y = y + Editor_state.line_height
 466   -- click past end of second screen line
 467   edit.run_after_mouse_click(Editor_state, App.screen.width-2,y-2, 1)
 468   -- cursor moves to end of screen line (one more than final character shown)
 469   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
 470   check_eq(Editor_state.cursor1.pos, 13, 'cursor:pos')
 471 end
 472
 473 function test_click_past_end_of_wrapping_line()
 474   -- display a wrapping line
 475   App.screen.init{width=75, height=80}
 476   Editor_state = edit.initialize_test_state()
 477                                --  12345678901234
 478   Editor_state.lines = load_array{"madam I'm adam"}
 479   Text.redraw_all(Editor_state)
 480   Editor_state.cursor1 = {line=1, pos=1}
 481   Editor_state.screen_top1 = {line=1, pos=1}
 482   edit.draw(Editor_state)
 483   local y = Editor_state.top
 484   App.screen.check(y, 'madam ', 'baseline/screen:1')
 485   y = y + Editor_state.line_height
 486   App.screen.check(y, "I'm ad", 'baseline/screen:2')
 487   y = y + Editor_state.line_height
 488   App.screen.check(y, 'am', 'baseline/screen:3')
 489   y = y + Editor_state.line_height
 490   -- click past the end of it
 491   edit.run_after_mouse_click(Editor_state, App.screen.width-2,y-2, 1)
 492   -- cursor moves to end of line
 493   check_eq(Editor_state.cursor1.pos, 15, 'cursor')  -- one more than the number of UTF-8 code-points
 494 end
 495
 496 function test_click_past_end_of_wrapping_line_containing_non_ascii()
 497   -- display a wrapping line containing non-ASCII
 498   App.screen.init{width=75, height=80}
 499   Editor_state = edit.initialize_test_state()
 500                                --  12345678901234
 501   Editor_state.lines = load_array{'madam I’m adam'}  -- notice the non-ASCII apostrophe
 502   Text.redraw_all(Editor_state)
 503   Editor_state.cursor1 = {line=1, pos=1}
 504   Editor_state.screen_top1 = {line=1, pos=1}
 505   edit.draw(Editor_state)
 506   local y = Editor_state.top
 507   App.screen.check(y, 'madam ', 'baseline/screen:1')
 508   y = y + Editor_state.line_height
 509   App.screen.check(y, 'I’m ad', 'baseline/screen:2')
 510   y = y + Editor_state.line_height
 511   App.screen.check(y, 'am', 'baseline/screen:3')
 512   y = y + Editor_state.line_height
 513   -- click past the end of it
 514   edit.run_after_mouse_click(Editor_state, App.screen.width-2,y-2, 1)
 515   -- cursor moves to end of line
 516   check_eq(Editor_state.cursor1.pos, 15, 'cursor')  -- one more than the number of UTF-8 code-points
 517 end
 518
 519 function test_click_past_end_of_word_wrapping_line()
 520   -- display a long line wrapping at a word boundary on a screen of more realistic length
 521   App.screen.init{width=160, height=80}
 522   Editor_state = edit.initialize_test_state()
 523                                 -- 0        1         2
 524                                 -- 123456789012345678901
 525   Editor_state.lines = load_array{'the quick brown fox jumped over the lazy dog'}
 526   Text.redraw_all(Editor_state)
 527   Editor_state.cursor1 = {line=1, pos=1}
 528   Editor_state.screen_top1 = {line=1, pos=1}
 529   edit.draw(Editor_state)
 530   local y = Editor_state.top
 531   App.screen.check(y, 'the quick brown fox ', 'baseline/screen:1')
 532   y = y + Editor_state.line_height
 533   -- click past the end of the screen line
 534   edit.run_after_mouse_click(Editor_state, App.screen.width-2,y-2, 1)
 535   -- cursor moves to end of screen line (one more than final character shown)
 536   check_eq(Editor_state.cursor1.pos, 21, 'cursor')
 537 end
 538
 539 function test_select_text()
 540   -- display a line of text
 541   App.screen.init{width=75, height=80}
 542   Editor_state = edit.initialize_test_state()
 543   Editor_state.lines = load_array{'abc def'}
 544   Text.redraw_all(Editor_state)
 545   Editor_state.cursor1 = {line=1, pos=1}
 546   Editor_state.screen_top1 = {line=1, pos=1}
 547   edit.draw(Editor_state)
 548   -- select a letter
 549   App.fake_key_press('lshift')
 550   edit.run_after_keychord(Editor_state, 'S-right', 'right')
 551   App.fake_key_release('lshift')
 552   edit.key_release(Editor_state, 'lshift')
 553   -- selection persists even after shift is released
 554   check_eq(Editor_state.selection1.line, 1, 'selection:line')
 555   check_eq(Editor_state.selection1.pos, 1, 'selection:pos')
 556   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
 557   check_eq(Editor_state.cursor1.pos, 2, 'cursor:pos')
 558 end
 559
 560 function test_cursor_movement_without_shift_resets_selection()
 561   -- display a line of text with some part selected
 562   App.screen.init{width=75, height=80}
 563   Editor_state = edit.initialize_test_state()
 564   Editor_state.lines = load_array{'abc'}
 565   Text.redraw_all(Editor_state)
 566   Editor_state.cursor1 = {line=1, pos=1}
 567   Editor_state.selection1 = {line=1, pos=2}
 568   Editor_state.screen_top1 = {line=1, pos=1}
 569   edit.draw(Editor_state)
 570   -- press an arrow key without shift
 571   edit.run_after_keychord(Editor_state, 'right', 'right')
 572   -- no change to data, selection is reset
 573   check_nil(Editor_state.selection1.line, 'check')
 574   check_eq(Editor_state.lines[1].data, 'abc', 'data')
 575 end
 576
 577 function test_edit_deletes_selection()
 578   -- display a line of text with some part selected
 579   App.screen.init{width=75, height=80}
 580   Editor_state = edit.initialize_test_state()
 581   Editor_state.lines = load_array{'abc'}
 582   Text.redraw_all(Editor_state)
 583   Editor_state.cursor1 = {line=1, pos=1}
 584   Editor_state.selection1 = {line=1, pos=2}
 585   Editor_state.screen_top1 = {line=1, pos=1}
 586   edit.draw(Editor_state)
 587   -- press a key
 588   edit.run_after_text_input(Editor_state, 'x')
 589   -- selected text is deleted and replaced with the key
 590   check_eq(Editor_state.lines[1].data, 'xbc', 'check')
 591 end
 592
 593 function test_edit_with_shift_key_deletes_selection()
 594   -- display a line of text with some part selected
 595   App.screen.init{width=75, height=80}
 596   Editor_state = edit.initialize_test_state()
 597   Editor_state.lines = load_array{'abc'}
 598   Text.redraw_all(Editor_state)
 599   Editor_state.cursor1 = {line=1, pos=1}
 600   Editor_state.selection1 = {line=1, pos=2}
 601   Editor_state.screen_top1 = {line=1, pos=1}
 602   edit.draw(Editor_state)
 603   -- mimic precise keypresses for a capital letter
 604   App.fake_key_press('lshift')
 605   edit.keychord_press(Editor_state, 'd', 'd')
 606   edit.text_input(Editor_state, 'D')
 607   edit.key_release(Editor_state, 'd')
 608   App.fake_key_release('lshift')
 609   -- selected text is deleted and replaced with the key
 610   check_nil(Editor_state.selection1.line, 'check')
 611   check_eq(Editor_state.lines[1].data, 'Dbc', 'data')
 612 end
 613
 614 function test_copy_does_not_reset_selection()
 615   -- display a line of text with a selection
 616   App.screen.init{width=75, height=80}
 617   Editor_state = edit.initialize_test_state()
 618   Editor_state.lines = load_array{'abc'}
 619   Text.redraw_all(Editor_state)
 620   Editor_state.cursor1 = {line=1, pos=1}
 621   Editor_state.selection1 = {line=1, pos=2}
 622   Editor_state.screen_top1 = {line=1, pos=1}
 623   edit.draw(Editor_state)
 624   -- copy selection
 625   edit.run_after_keychord(Editor_state, 'C-c', 'c')
 626   check_eq(App.clipboard, 'a', 'clipboard')
 627   -- selection is reset since shift key is not pressed
 628   check(Editor_state.selection1.line, 'check')
 629 end
 630
 631 function test_cut()
 632   -- display a line of text with some part selected
 633   App.screen.init{width=75, height=80}
 634   Editor_state = edit.initialize_test_state()
 635   Editor_state.lines = load_array{'abc'}
 636   Text.redraw_all(Editor_state)
 637   Editor_state.cursor1 = {line=1, pos=1}
 638   Editor_state.selection1 = {line=1, pos=2}
 639   Editor_state.screen_top1 = {line=1, pos=1}
 640   edit.draw(Editor_state)
 641   -- press a key
 642   edit.run_after_keychord(Editor_state, 'C-x', 'x')
 643   check_eq(App.clipboard, 'a', 'clipboard')
 644   -- selected text is deleted
 645   check_eq(Editor_state.lines[1].data, 'bc', 'data')
 646 end
 647
 648 function test_paste_replaces_selection()
 649   -- display a line of text with a selection
 650   App.screen.init{width=75, height=80}
 651   Editor_state = edit.initialize_test_state()
 652   Editor_state.lines = load_array{'abc', 'def'}
 653   Text.redraw_all(Editor_state)
 654   Editor_state.cursor1 = {line=2, pos=1}
 655   Editor_state.selection1 = {line=1, pos=1}
 656   Editor_state.screen_top1 = {line=1, pos=1}
 657   edit.draw(Editor_state)
 658   -- set clipboard
 659   App.clipboard = 'xyz'
 660   -- paste selection
 661   edit.run_after_keychord(Editor_state, 'C-v', 'v')
 662   -- selection is reset since shift key is not pressed
 663   -- selection includes the newline, so it's also deleted
 664   check_eq(Editor_state.lines[1].data, 'xyzdef', 'check')
 665 end
 666
 667 function test_deleting_selection_may_scroll()
 668   -- display lines 2/3/4
 669   App.screen.init{width=120, height=60}
 670   Editor_state = edit.initialize_test_state()
 671   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
 672   Text.redraw_all(Editor_state)
 673   Editor_state.cursor1 = {line=3, pos=2}
 674   Editor_state.screen_top1 = {line=2, pos=1}
 675   edit.draw(Editor_state)
 676   local y = Editor_state.top
 677   App.screen.check(y, 'def', 'baseline/screen:1')
 678   y = y + Editor_state.line_height
 679   App.screen.check(y, 'ghi', 'baseline/screen:2')
 680   y = y + Editor_state.line_height
 681   App.screen.check(y, 'jkl', 'baseline/screen:3')
 682   -- set up a selection starting above the currently displayed page
 683   Editor_state.selection1 = {line=1, pos=2}
 684   -- delete selection
 685   edit.run_after_keychord(Editor_state, 'backspace', 'backspace')
 686   -- page scrolls up
 687   check_eq(Editor_state.screen_top1.line, 1, 'check')
 688   check_eq(Editor_state.lines[1].data, 'ahi', 'data')
 689 end
 690
 691 function test_edit_wrapping_text()
 692   App.screen.init{width=50, height=60}
 693   Editor_state = edit.initialize_test_state()
 694   Editor_state.lines = load_array{'abc', 'def', 'xyz'}
 695   Text.redraw_all(Editor_state)
 696   Editor_state.cursor1 = {line=2, pos=4}
 697   Editor_state.screen_top1 = {line=1, pos=1}
 698   edit.draw(Editor_state)
 699   edit.run_after_text_input(Editor_state, 'g')
 700   local y = Editor_state.top
 701   App.screen.check(y, 'abc', 'screen:1')
 702   y = y + Editor_state.line_height
 703   App.screen.check(y, 'de', 'screen:2')
 704   y = y + Editor_state.line_height
 705   App.screen.check(y, 'fg', 'screen:3')
 706 end
 707
 708 function test_insert_newline()
 709   -- display a few lines
 710   App.screen.init{width=Editor_state.left+30, height=60}
 711   Editor_state = edit.initialize_test_state()
 712   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
 713   Text.redraw_all(Editor_state)
 714   Editor_state.cursor1 = {line=1, pos=2}
 715   Editor_state.screen_top1 = {line=1, pos=1}
 716   edit.draw(Editor_state)
 717   local y = Editor_state.top
 718   App.screen.check(y, 'abc', 'baseline/screen:1')
 719   y = y + Editor_state.line_height
 720   App.screen.check(y, 'def', 'baseline/screen:2')
 721   y = y + Editor_state.line_height
 722   App.screen.check(y, 'ghi', 'baseline/screen:3')
 723   -- hitting the enter key splits the line
 724   edit.run_after_keychord(Editor_state, 'return', 'return')
 725   check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
 726   check_eq(Editor_state.cursor1.line, 2, 'cursor:line')
 727   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
 728   y = Editor_state.top
 729   App.screen.check(y, 'a', 'screen:1')
 730   y = y + Editor_state.line_height
 731   App.screen.check(y, 'bc', 'screen:2')
 732   y = y + Editor_state.line_height
 733   App.screen.check(y, 'def', 'screen:3')
 734 end
 735
 736 function test_insert_newline_at_start_of_line()
 737   -- display a line
 738   App.screen.init{width=Editor_state.left+30, height=60}
 739   Editor_state = edit.initialize_test_state()
 740   Editor_state.lines = load_array{'abc'}
 741   Text.redraw_all(Editor_state)
 742   Editor_state.cursor1 = {line=1, pos=1}
 743   Editor_state.screen_top1 = {line=1, pos=1}
 744   -- hitting the enter key splits the line
 745   edit.run_after_keychord(Editor_state, 'return', 'return')
 746   check_eq(Editor_state.cursor1.line, 2, 'cursor:line')
 747   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
 748   check_eq(Editor_state.lines[1].data, '', 'data:1')
 749   check_eq(Editor_state.lines[2].data, 'abc', 'data:2')
 750 end
 751
 752 function test_insert_from_clipboard()
 753   -- display a few lines
 754   App.screen.init{width=Editor_state.left+30, height=60}
 755   Editor_state = edit.initialize_test_state()
 756   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
 757   Text.redraw_all(Editor_state)
 758   Editor_state.cursor1 = {line=1, pos=2}
 759   Editor_state.screen_top1 = {line=1, pos=1}
 760   edit.draw(Editor_state)
 761   local y = Editor_state.top
 762   App.screen.check(y, 'abc', 'baseline/screen:1')
 763   y = y + Editor_state.line_height
 764   App.screen.check(y, 'def', 'baseline/screen:2')
 765   y = y + Editor_state.line_height
 766   App.screen.check(y, 'ghi', 'baseline/screen:3')
 767   -- paste some text including a newline, check that new line is created
 768   App.clipboard = 'xy\nz'
 769   edit.run_after_keychord(Editor_state, 'C-v', 'v')
 770   check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
 771   check_eq(Editor_state.cursor1.line, 2, 'cursor:line')
 772   check_eq(Editor_state.cursor1.pos, 2, 'cursor:pos')
 773   y = Editor_state.top
 774   App.screen.check(y, 'axy', 'screen:1')
 775   y = y + Editor_state.line_height
 776   App.screen.check(y, 'zbc', 'screen:2')
 777   y = y + Editor_state.line_height
 778   App.screen.check(y, 'def', 'screen:3')
 779 end
 780
 781 function test_select_text_using_mouse()
 782   App.screen.init{width=50, height=60}
 783   Editor_state = edit.initialize_test_state()
 784   Editor_state.lines = load_array{'abc', 'def', 'xyz'}
 785   Text.redraw_all(Editor_state)
 786   Editor_state.cursor1 = {line=1, pos=1}
 787   Editor_state.screen_top1 = {line=1, pos=1}
 788   Editor_state.selection1 = {}
 789   edit.draw(Editor_state)  -- populate line_cache.startpos for each line
 790   -- press and hold on first location
 791   edit.run_after_mouse_press(Editor_state, Editor_state.left+8,Editor_state.top+5, 1)
 792   -- drag and release somewhere else
 793   edit.run_after_mouse_release(Editor_state, Editor_state.left+20,Editor_state.top+Editor_state.line_height+5, 1)
 794   check_eq(Editor_state.selection1.line, 1, 'selection:line')
 795   check_eq(Editor_state.selection1.pos, 2, 'selection:pos')
 796   check_eq(Editor_state.cursor1.line, 2, 'cursor:line')
 797   check_eq(Editor_state.cursor1.pos, 4, 'cursor:pos')
 798 end
 799
 800 function test_select_text_using_mouse_starting_above_text()
 801   App.screen.init{width=50, height=60}
 802   Editor_state = edit.initialize_test_state()
 803   Editor_state.lines = load_array{'abc', 'def', 'xyz'}
 804   Text.redraw_all(Editor_state)
 805   Editor_state.cursor1 = {line=1, pos=1}
 806   Editor_state.screen_top1 = {line=1, pos=1}
 807   Editor_state.selection1 = {}
 808   edit.draw(Editor_state)  -- populate line_cache.startpos for each line
 809   -- press mouse above first line of text
 810   edit.run_after_mouse_press(Editor_state, Editor_state.left+8,5, 1)
 811   check(Editor_state.selection1.line ~= nil, 'selection:line-not-nil')
 812   check_eq(Editor_state.selection1.line, 1, 'selection:line')
 813   check_eq(Editor_state.selection1.pos, 1, 'selection:pos')
 814 end
 815
 816 function test_select_text_using_mouse_starting_above_text_wrapping_line()
 817   -- first screen line starts in the middle of a line
 818   App.screen.init{width=50, height=60}
 819   Editor_state = edit.initialize_test_state()
 820   Editor_state.lines = load_array{'abc', 'defgh', 'xyz'}
 821   Text.redraw_all(Editor_state)
 822   Editor_state.cursor1 = {line=2, pos=5}
 823   Editor_state.screen_top1 = {line=2, pos=3}
 824   -- press mouse above first line of text
 825   edit.draw(Editor_state)
 826   edit.run_after_mouse_press(Editor_state, Editor_state.left+8,5, 1)
 827   -- selection is at screen top
 828   check(Editor_state.selection1.line ~= nil, 'selection:line-not-nil')
 829   check_eq(Editor_state.selection1.line, 2, 'selection:line')
 830   check_eq(Editor_state.selection1.pos, 3, 'selection:pos')
 831 end
 832
 833 function test_select_text_using_mouse_starting_below_text()
 834   -- I'd like to test what happens when a mouse click is below some page of
 835   -- text, potentially even in the middle of a line.
 836   -- However, it's brittle to set up a text line boundary just right.
 837   -- So I'm going to just check things below the bottom of the final line of
 838   -- text when it's in the middle of the screen.
 839   -- final screen line ends in the middle of screen
 840   App.screen.init{width=50, height=60}
 841   Editor_state = edit.initialize_test_state()
 842   Editor_state.lines = load_array{'abcde'}
 843   Text.redraw_all(Editor_state)
 844   Editor_state.cursor1 = {line=1, pos=1}
 845   Editor_state.screen_top1 = {line=1, pos=1}
 846   edit.draw(Editor_state)
 847   local y = Editor_state.top
 848   App.screen.check(y, 'ab', 'baseline:screen:1')
 849   y = y + Editor_state.line_height
 850   App.screen.check(y, 'cde', 'baseline:screen:2')
 851   -- press mouse above first line of text
 852   edit.run_after_mouse_press(Editor_state, 5,App.screen.height-5, 1)
 853   -- selection is past bottom-most text in screen
 854   check(Editor_state.selection1.line ~= nil, 'selection:line-not-nil')
 855   check_eq(Editor_state.selection1.line, 1, 'selection:line')
 856   check_eq(Editor_state.selection1.pos, 6, 'selection:pos')
 857 end
 858
 859 function test_select_text_using_mouse_and_shift()
 860   App.screen.init{width=50, height=60}
 861   Editor_state = edit.initialize_test_state()
 862   Editor_state.lines = load_array{'abc', 'def', 'xyz'}
 863   Text.redraw_all(Editor_state)
 864   Editor_state.cursor1 = {line=1, pos=1}
 865   Editor_state.screen_top1 = {line=1, pos=1}
 866   Editor_state.selection1 = {}
 867   edit.draw(Editor_state)  -- populate line_cache.startpos for each line
 868   -- click on first location
 869   edit.run_after_mouse_press(Editor_state, Editor_state.left+8,Editor_state.top+5, 1)
 870   edit.run_after_mouse_release(Editor_state, Editor_state.left+8,Editor_state.top+5, 1)
 871   -- hold down shift and click somewhere else
 872   App.fake_key_press('lshift')
 873   edit.run_after_mouse_press(Editor_state, Editor_state.left+20,Editor_state.top+5, 1)
 874   edit.run_after_mouse_release(Editor_state, Editor_state.left+20,Editor_state.top+Editor_state.line_height+5, 1)
 875   App.fake_key_release('lshift')
 876   check_eq(Editor_state.selection1.line, 1, 'selection:line')
 877   check_eq(Editor_state.selection1.pos, 2, 'selection:pos')
 878   check_eq(Editor_state.cursor1.line, 2, 'cursor:line')
 879   check_eq(Editor_state.cursor1.pos, 4, 'cursor:pos')
 880 end
 881
 882 function test_select_text_repeatedly_using_mouse_and_shift()
 883   App.screen.init{width=50, height=60}
 884   Editor_state = edit.initialize_test_state()
 885   Editor_state.lines = load_array{'abc', 'def', 'xyz'}
 886   Text.redraw_all(Editor_state)
 887   Text.redraw_all(Editor_state)
 888   Editor_state.cursor1 = {line=1, pos=1}
 889   Editor_state.screen_top1 = {line=1, pos=1}
 890   Editor_state.selection1 = {}
 891   edit.draw(Editor_state)  -- populate line_cache.startpos for each line
 892   -- click on first location
 893   edit.run_after_mouse_press(Editor_state, Editor_state.left+8,Editor_state.top+5, 1)
 894   edit.run_after_mouse_release(Editor_state, Editor_state.left+8,Editor_state.top+5, 1)
 895   -- hold down shift and click on a second location
 896   App.fake_key_press('lshift')
 897   edit.run_after_mouse_press(Editor_state, Editor_state.left+20,Editor_state.top+5, 1)
 898   edit.run_after_mouse_release(Editor_state, Editor_state.left+20,Editor_state.top+Editor_state.line_height+5, 1)
 899   -- hold down shift and click at a third location
 900   App.fake_key_press('lshift')
 901   edit.run_after_mouse_press(Editor_state, Editor_state.left+20,Editor_state.top+5, 1)
 902   edit.run_after_mouse_release(Editor_state, Editor_state.left+8,Editor_state.top+Editor_state.line_height+5, 1)
 903   App.fake_key_release('lshift')
 904   -- selection is between first and third location. forget the second location, not the first.
 905   check_eq(Editor_state.selection1.line, 1, 'selection:line')
 906   check_eq(Editor_state.selection1.pos, 2, 'selection:pos')
 907   check_eq(Editor_state.cursor1.line, 2, 'cursor:line')
 908   check_eq(Editor_state.cursor1.pos, 2, 'cursor:pos')
 909 end
 910
 911 function test_select_all_text()
 912   -- display a single line of text
 913   App.screen.init{width=75, height=80}
 914   Editor_state = edit.initialize_test_state()
 915   Editor_state.lines = load_array{'abc def'}
 916   Text.redraw_all(Editor_state)
 917   Editor_state.cursor1 = {line=1, pos=1}
 918   Editor_state.screen_top1 = {line=1, pos=1}
 919   edit.draw(Editor_state)
 920   -- select all
 921   App.fake_key_press('lctrl')
 922   edit.run_after_keychord(Editor_state, 'C-a', 'a')
 923   App.fake_key_release('lctrl')
 924   edit.key_release(Editor_state, 'lctrl')
 925   -- selection
 926   check_eq(Editor_state.selection1.line, 1, 'selection:line')
 927   check_eq(Editor_state.selection1.pos, 1, 'selection:pos')
 928   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
 929   check_eq(Editor_state.cursor1.pos, 8, 'cursor:pos')
 930 end
 931
 932 function test_cut_without_selection()
 933   -- display a few lines
 934   App.screen.init{width=Editor_state.left+30, height=60}
 935   Editor_state = edit.initialize_test_state()
 936   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
 937   Text.redraw_all(Editor_state)
 938   Editor_state.cursor1 = {line=1, pos=2}
 939   Editor_state.screen_top1 = {line=1, pos=1}
 940   Editor_state.selection1 = {}
 941   edit.draw(Editor_state)
 942   -- try to cut without selecting text
 943   edit.run_after_keychord(Editor_state, 'C-x', 'x')
 944   -- no crash
 945   check_nil(Editor_state.selection1.line, 'check')
 946 end
 947
 948 function test_pagedown()
 949   App.screen.init{width=120, height=45}
 950   Editor_state = edit.initialize_test_state()
 951   Editor_state.lines = load_array{'abc', 'def', 'ghi'}
 952   Text.redraw_all(Editor_state)
 953   Editor_state.cursor1 = {line=1, pos=1}
 954   Editor_state.screen_top1 = {line=1, pos=1}
 955   -- initially the first two lines are displayed
 956   edit.draw(Editor_state)
 957   local y = Editor_state.top
 958   App.screen.check(y, 'abc', 'baseline/screen:1')
 959   y = y + Editor_state.line_height
 960   App.screen.check(y, 'def', 'baseline/screen:2')
 961   -- after pagedown the bottom line becomes the top
 962   edit.run_after_keychord(Editor_state, 'pagedown', 'pagedown')
 963   check_eq(Editor_state.screen_top1.line, 2, 'screen_top')
 964   check_eq(Editor_state.cursor1.line, 2, 'cursor')
 965   y = Editor_state.top
 966   App.screen.check(y, 'def', 'screen:1')
 967   y = y + Editor_state.line_height
 968   App.screen.check(y, 'ghi', 'screen:2')
 969 end
 970
 971 function test_pagedown_can_start_from_middle_of_long_wrapping_line()
 972   -- draw a few lines starting from a very long wrapping line
 973   App.screen.init{width=Editor_state.left+30, height=60}
 974   Editor_state = edit.initialize_test_state()
 975   Editor_state.lines = load_array{'abc def ghi jkl mno pqr stu vwx yza bcd efg hij', 'XYZ'}
 976   Text.redraw_all(Editor_state)
 977   Editor_state.cursor1 = {line=1, pos=2}
 978   Editor_state.screen_top1 = {line=1, pos=1}
 979   edit.draw(Editor_state)
 980   local y = Editor_state.top
 981   App.screen.check(y, 'abc ', 'baseline/screen:1')
 982   y = y + Editor_state.line_height
 983   App.screen.check(y, 'def ', 'baseline/screen:2')
 984   y = y + Editor_state.line_height
 985   App.screen.check(y, 'ghi ', 'baseline/screen:3')
 986   -- after pagedown we scroll down the very long wrapping line
 987   edit.run_after_keychord(Editor_state, 'pagedown', 'pagedown')
 988   check_eq(Editor_state.screen_top1.line, 1, 'screen_top:line')
 989   check_eq(Editor_state.screen_top1.pos, 9, 'screen_top:pos')
 990   y = Editor_state.top
 991   App.screen.check(y, 'ghi ', 'screen:1')
 992   y = y + Editor_state.line_height
 993   App.screen.check(y, 'jkl ', 'screen:2')
 994   y = y + Editor_state.line_height
 995   if Version == '12.0' then
 996     -- HACK: Maybe v12.0 uses a different font? Strange that it only causes
 997     -- issues in a couple of places.
 998     -- We'll need to rethink our tests if issues like this start to multiply.
 999     App.screen.check(y, 'mno ', 'screen:3')
1000   else
1001     App.screen.check(y, 'mn', 'screen:3')
1002   end
1003 end
1004
1005 function test_pagedown_never_moves_up()
1006   -- draw the final screen line of a wrapping line
1007   App.screen.init{width=Editor_state.left+30, height=60}
1008   Editor_state = edit.initialize_test_state()
1009   Editor_state.lines = load_array{'abc def ghi'}
1010   Text.redraw_all(Editor_state)
1011   Editor_state.cursor1 = {line=1, pos=9}
1012   Editor_state.screen_top1 = {line=1, pos=9}
1013   edit.draw(Editor_state)
1014   -- pagedown makes no change
1015   edit.run_after_keychord(Editor_state, 'pagedown', 'pagedown')
1016   check_eq(Editor_state.screen_top1.line, 1, 'screen_top:line')
1017   check_eq(Editor_state.screen_top1.pos, 9, 'screen_top:pos')
1018 end
1019
1020 function test_down_arrow_moves_cursor()
1021   App.screen.init{width=120, height=60}
1022   Editor_state = edit.initialize_test_state()
1023   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
1024   Text.redraw_all(Editor_state)
1025   Editor_state.cursor1 = {line=1, pos=1}
1026   Editor_state.screen_top1 = {line=1, pos=1}
1027   -- initially the first three lines are displayed
1028   edit.draw(Editor_state)
1029   local y = Editor_state.top
1030   App.screen.check(y, 'abc', 'baseline/screen:1')
1031   y = y + Editor_state.line_height
1032   App.screen.check(y, 'def', 'baseline/screen:2')
1033   y = y + Editor_state.line_height
1034   App.screen.check(y, 'ghi', 'baseline/screen:3')
1035   -- after hitting the down arrow, the cursor moves down by 1 line
1036   edit.run_after_keychord(Editor_state, 'down', 'down')
1037   check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
1038   check_eq(Editor_state.cursor1.line, 2, 'cursor')
1039   -- the screen is unchanged
1040   y = Editor_state.top
1041   App.screen.check(y, 'abc', 'screen:1')
1042   y = y + Editor_state.line_height
1043   App.screen.check(y, 'def', 'screen:2')
1044   y = y + Editor_state.line_height
1045   App.screen.check(y, 'ghi', 'screen:3')
1046 end
1047
1048 function test_down_arrow_scrolls_down_by_one_line()
1049   -- display the first three lines with the cursor on the bottom line
1050   App.screen.init{width=120, height=60}
1051   Editor_state = edit.initialize_test_state()
1052   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
1053   Text.redraw_all(Editor_state)
1054   Editor_state.cursor1 = {line=3, pos=1}
1055   Editor_state.screen_top1 = {line=1, pos=1}
1056   edit.draw(Editor_state)
1057   local y = Editor_state.top
1058   App.screen.check(y, 'abc', 'baseline/screen:1')
1059   y = y + Editor_state.line_height
1060   App.screen.check(y, 'def', 'baseline/screen:2')
1061   y = y + Editor_state.line_height
1062   App.screen.check(y, 'ghi', 'baseline/screen:3')
1063   -- after hitting the down arrow the screen scrolls down by one line
1064   edit.run_after_keychord(Editor_state, 'down', 'down')
1065   check_eq(Editor_state.screen_top1.line, 2, 'screen_top')
1066   check_eq(Editor_state.cursor1.line, 4, 'cursor')
1067   y = Editor_state.top
1068   App.screen.check(y, 'def', 'screen:1')
1069   y = y + Editor_state.line_height
1070   App.screen.check(y, 'ghi', 'screen:2')
1071   y = y + Editor_state.line_height
1072   App.screen.check(y, 'jkl', 'screen:3')
1073 end
1074
1075 function test_down_arrow_scrolls_down_by_one_screen_line()
1076   -- display the first three lines with the cursor on the bottom line
1077   App.screen.init{width=Editor_state.left+30, height=60}
1078   Editor_state = edit.initialize_test_state()
1079   Editor_state.lines = load_array{'abc', 'def', 'ghi jkl', 'mno'}
1080   Text.redraw_all(Editor_state)
1081   Editor_state.cursor1 = {line=3, pos=1}
1082   Editor_state.screen_top1 = {line=1, pos=1}
1083   edit.draw(Editor_state)
1084   local y = Editor_state.top
1085   App.screen.check(y, 'abc', 'baseline/screen:1')
1086   y = y + Editor_state.line_height
1087   App.screen.check(y, 'def', 'baseline/screen:2')
1088   y = y + Editor_state.line_height
1089   App.screen.check(y, 'ghi ', 'baseline/screen:3')  -- line wrapping includes trailing whitespace
1090   -- after hitting the down arrow the screen scrolls down by one line
1091   edit.run_after_keychord(Editor_state, 'down', 'down')
1092   check_eq(Editor_state.screen_top1.line, 2, 'screen_top')
1093   check_eq(Editor_state.cursor1.line, 3, 'cursor:line')
1094   check_eq(Editor_state.cursor1.pos, 5, 'cursor:pos')
1095   y = Editor_state.top
1096   App.screen.check(y, 'def', 'screen:1')
1097   y = y + Editor_state.line_height
1098   App.screen.check(y, 'ghi ', 'screen:2')
1099   y = y + Editor_state.line_height
1100   App.screen.check(y, 'jkl', 'screen:3')
1101 end
1102
1103 function test_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word()
1104   -- display the first three lines with the cursor on the bottom line
1105   App.screen.init{width=Editor_state.left+30, height=60}
1106   Editor_state = edit.initialize_test_state()
1107   Editor_state.lines = load_array{'abc', 'def', 'ghijkl', 'mno'}
1108   Text.redraw_all(Editor_state)
1109   Editor_state.cursor1 = {line=3, pos=1}
1110   Editor_state.screen_top1 = {line=1, pos=1}
1111   edit.draw(Editor_state)
1112   local y = Editor_state.top
1113   App.screen.check(y, 'abc', 'baseline/screen:1')
1114   y = y + Editor_state.line_height
1115   App.screen.check(y, 'def', 'baseline/screen:2')
1116   y = y + Editor_state.line_height
1117   App.screen.check(y, 'ghij', 'baseline/screen:3')
1118   -- after hitting the down arrow the screen scrolls down by one line
1119   edit.run_after_keychord(Editor_state, 'down', 'down')
1120   check_eq(Editor_state.screen_top1.line, 2, 'screen_top')
1121   check_eq(Editor_state.cursor1.line, 3, 'cursor:line')
1122   check_eq(Editor_state.cursor1.pos, 5, 'cursor:pos')
1123   y = Editor_state.top
1124   App.screen.check(y, 'def', 'screen:1')
1125   y = y + Editor_state.line_height
1126   App.screen.check(y, 'ghij', 'screen:2')
1127   y = y + Editor_state.line_height
1128   App.screen.check(y, 'kl', 'screen:3')
1129 end
1130
1131 function test_pagedown_followed_by_down_arrow_does_not_scroll_screen_up()
1132   App.screen.init{width=Editor_state.left+30, height=60}
1133   Editor_state = edit.initialize_test_state()
1134   Editor_state.lines = load_array{'abc', 'def', 'ghijkl', 'mno'}
1135   Text.redraw_all(Editor_state)
1136   Editor_state.cursor1 = {line=3, pos=1}
1137   Editor_state.screen_top1 = {line=1, pos=1}
1138   edit.draw(Editor_state)
1139   local y = Editor_state.top
1140   App.screen.check(y, 'abc', 'baseline/screen:1')
1141   y = y + Editor_state.line_height
1142   App.screen.check(y, 'def', 'baseline/screen:2')
1143   y = y + Editor_state.line_height
1144   App.screen.check(y, 'ghij', 'baseline/screen:3')
1145   -- after hitting pagedown the screen scrolls down to start of a long line
1146   edit.run_after_keychord(Editor_state, 'pagedown', 'pagedown')
1147   check_eq(Editor_state.screen_top1.line, 3, 'baseline2/screen_top')
1148   check_eq(Editor_state.cursor1.line, 3, 'baseline2/cursor:line')
1149   check_eq(Editor_state.cursor1.pos, 1, 'baseline2/cursor:pos')
1150   -- after hitting down arrow the screen doesn't scroll down further, and certainly doesn't scroll up
1151   edit.run_after_keychord(Editor_state, 'down', 'down')
1152   check_eq(Editor_state.screen_top1.line, 3, 'screen_top')
1153   check_eq(Editor_state.cursor1.line, 3, 'cursor:line')
1154   check_eq(Editor_state.cursor1.pos, 5, 'cursor:pos')
1155   y = Editor_state.top
1156   App.screen.check(y, 'ghij', 'screen:1')
1157   y = y + Editor_state.line_height
1158   App.screen.check(y, 'kl', 'screen:2')
1159   y = y + Editor_state.line_height
1160   App.screen.check(y, 'mno', 'screen:3')
1161 end
1162
1163 function test_up_arrow_moves_cursor()
1164   -- display the first 3 lines with the cursor on the bottom line
1165   App.screen.init{width=120, height=60}
1166   Editor_state = edit.initialize_test_state()
1167   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
1168   Text.redraw_all(Editor_state)
1169   Editor_state.cursor1 = {line=3, pos=1}
1170   Editor_state.screen_top1 = {line=1, pos=1}
1171   edit.draw(Editor_state)
1172   local y = Editor_state.top
1173   App.screen.check(y, 'abc', 'baseline/screen:1')
1174   y = y + Editor_state.line_height
1175   App.screen.check(y, 'def', 'baseline/screen:2')
1176   y = y + Editor_state.line_height
1177   App.screen.check(y, 'ghi', 'baseline/screen:3')
1178   -- after hitting the up arrow the cursor moves up by 1 line
1179   edit.run_after_keychord(Editor_state, 'up', 'up')
1180   check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
1181   check_eq(Editor_state.cursor1.line, 2, 'cursor')
1182   -- the screen is unchanged
1183   y = Editor_state.top
1184   App.screen.check(y, 'abc', 'screen:1')
1185   y = y + Editor_state.line_height
1186   App.screen.check(y, 'def', 'screen:2')
1187   y = y + Editor_state.line_height
1188   App.screen.check(y, 'ghi', 'screen:3')
1189 end
1190
1191 function test_up_arrow_scrolls_up_by_one_line()
1192   -- display the lines 2/3/4 with the cursor on line 2
1193   App.screen.init{width=120, height=60}
1194   Editor_state = edit.initialize_test_state()
1195   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
1196   Text.redraw_all(Editor_state)
1197   Editor_state.cursor1 = {line=2, pos=1}
1198   Editor_state.screen_top1 = {line=2, pos=1}
1199   edit.draw(Editor_state)
1200   local y = Editor_state.top
1201   App.screen.check(y, 'def', 'baseline/screen:1')
1202   y = y + Editor_state.line_height
1203   App.screen.check(y, 'ghi', 'baseline/screen:2')
1204   y = y + Editor_state.line_height
1205   App.screen.check(y, 'jkl', 'baseline/screen:3')
1206   -- after hitting the up arrow the screen scrolls up by one line
1207   edit.run_after_keychord(Editor_state, 'up', 'up')
1208   check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
1209   check_eq(Editor_state.cursor1.line, 1, 'cursor')
1210   y = Editor_state.top
1211   App.screen.check(y, 'abc', 'screen:1')
1212   y = y + Editor_state.line_height
1213   App.screen.check(y, 'def', 'screen:2')
1214   y = y + Editor_state.line_height
1215   App.screen.check(y, 'ghi', 'screen:3')
1216 end
1217
1218 function test_up_arrow_scrolls_up_by_one_screen_line()
1219   -- display lines starting from second screen line of a line
1220   App.screen.init{width=Editor_state.left+30, height=60}
1221   Editor_state = edit.initialize_test_state()
1222   Editor_state.lines = load_array{'abc', 'def', 'ghi jkl', 'mno'}
1223   Text.redraw_all(Editor_state)
1224   Editor_state.cursor1 = {line=3, pos=6}
1225   Editor_state.screen_top1 = {line=3, pos=5}
1226   edit.draw(Editor_state)
1227   local y = Editor_state.top
1228   App.screen.check(y, 'jkl', 'baseline/screen:1')
1229   y = y + Editor_state.line_height
1230   App.screen.check(y, 'mno', 'baseline/screen:2')
1231   -- after hitting the up arrow the screen scrolls up to first screen line
1232   edit.run_after_keychord(Editor_state, 'up', 'up')
1233   y = Editor_state.top
1234   App.screen.check(y, 'ghi ', 'screen:1')
1235   y = y + Editor_state.line_height
1236   App.screen.check(y, 'jkl', 'screen:2')
1237   y = y + Editor_state.line_height
1238   App.screen.check(y, 'mno', 'screen:3')
1239   check_eq(Editor_state.screen_top1.line, 3, 'screen_top:line')
1240   check_eq(Editor_state.screen_top1.pos, 1, 'screen_top:pos')
1241   check_eq(Editor_state.cursor1.line, 3, 'cursor:line')
1242   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
1243 end
1244
1245 function test_up_arrow_scrolls_up_to_final_screen_line()
1246   -- display lines starting just after a long line
1247   App.screen.init{width=Editor_state.left+30, height=60}
1248   Editor_state = edit.initialize_test_state()
1249   Editor_state.lines = load_array{'abc def', 'ghi', 'jkl', 'mno'}
1250   Text.redraw_all(Editor_state)
1251   Editor_state.cursor1 = {line=2, pos=1}
1252   Editor_state.screen_top1 = {line=2, pos=1}
1253   edit.draw(Editor_state)
1254   local y = Editor_state.top
1255   App.screen.check(y, 'ghi', 'baseline/screen:1')
1256   y = y + Editor_state.line_height
1257   App.screen.check(y, 'jkl', 'baseline/screen:2')
1258   y = y + Editor_state.line_height
1259   App.screen.check(y, 'mno', 'baseline/screen:3')
1260   -- after hitting the up arrow the screen scrolls up to final screen line of previous line
1261   edit.run_after_keychord(Editor_state, 'up', 'up')
1262   y = Editor_state.top
1263   App.screen.check(y, 'def', 'screen:1')
1264   y = y + Editor_state.line_height
1265   App.screen.check(y, 'ghi', 'screen:2')
1266   y = y + Editor_state.line_height
1267   App.screen.check(y, 'jkl', 'screen:3')
1268   check_eq(Editor_state.screen_top1.line, 1, 'screen_top:line')
1269   check_eq(Editor_state.screen_top1.pos, 5, 'screen_top:pos')
1270   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
1271   check_eq(Editor_state.cursor1.pos, 5, 'cursor:pos')
1272 end
1273
1274 function test_up_arrow_scrolls_up_to_empty_line()
1275   -- display a screenful of text with an empty line just above it outside the screen
1276   App.screen.init{width=120, height=60}
1277   Editor_state = edit.initialize_test_state()
1278   Editor_state.lines = load_array{'', 'abc', 'def', 'ghi', 'jkl'}
1279   Text.redraw_all(Editor_state)
1280   Editor_state.cursor1 = {line=2, pos=1}
1281   Editor_state.screen_top1 = {line=2, pos=1}
1282   edit.draw(Editor_state)
1283   local y = Editor_state.top
1284   App.screen.check(y, 'abc', 'baseline/screen:1')
1285   y = y + Editor_state.line_height
1286   App.screen.check(y, 'def', 'baseline/screen:2')
1287   y = y + Editor_state.line_height
1288   App.screen.check(y, 'ghi', 'baseline/screen:3')
1289   -- after hitting the up arrow the screen scrolls up by one line
1290   edit.run_after_keychord(Editor_state, 'up', 'up')
1291   check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
1292   check_eq(Editor_state.cursor1.line, 1, 'cursor')
1293   y = Editor_state.top
1294   -- empty first line
1295   y = y + Editor_state.line_height
1296   App.screen.check(y, 'abc', 'screen:2')
1297   y = y + Editor_state.line_height
1298   App.screen.check(y, 'def', 'screen:3')
1299 end
1300
1301 function test_pageup()
1302   App.screen.init{width=120, height=45}
1303   Editor_state = edit.initialize_test_state()
1304   Editor_state.lines = load_array{'abc', 'def', 'ghi'}
1305   Text.redraw_all(Editor_state)
1306   Editor_state.cursor1 = {line=2, pos=1}
1307   Editor_state.screen_top1 = {line=2, pos=1}
1308   -- initially the last two lines are displayed
1309   edit.draw(Editor_state)
1310   local y = Editor_state.top
1311   App.screen.check(y, 'def', 'baseline/screen:1')
1312   y = y + Editor_state.line_height
1313   App.screen.check(y, 'ghi', 'baseline/screen:2')
1314   -- after pageup the cursor goes to first line
1315   edit.run_after_keychord(Editor_state, 'pageup', 'pageup')
1316   check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
1317   check_eq(Editor_state.cursor1.line, 1, 'cursor')
1318   y = Editor_state.top
1319   App.screen.check(y, 'abc', 'screen:1')
1320   y = y + Editor_state.line_height
1321   App.screen.check(y, 'def', 'screen:2')
1322 end
1323
1324 function test_pageup_scrolls_up_by_screen_line()
1325   -- display the first three lines with the cursor on the bottom line
1326   App.screen.init{width=Editor_state.left+30, height=60}
1327   Editor_state = edit.initialize_test_state()
1328   Editor_state.lines = load_array{'abc def', 'ghi', 'jkl', 'mno'}
1329   Text.redraw_all(Editor_state)
1330   Editor_state.cursor1 = {line=2, pos=1}
1331   Editor_state.screen_top1 = {line=2, pos=1}
1332   edit.draw(Editor_state)
1333   local y = Editor_state.top
1334   App.screen.check(y, 'ghi', 'baseline/screen:1')
1335   y = y + Editor_state.line_height
1336   App.screen.check(y, 'jkl', 'baseline/screen:2')
1337   y = y + Editor_state.line_height
1338   App.screen.check(y, 'mno', 'baseline/screen:3')  -- line wrapping includes trailing whitespace
1339   -- after hitting the page-up key the screen scrolls up to top
1340   edit.run_after_keychord(Editor_state, 'pageup', 'pageup')
1341   check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
1342   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
1343   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
1344   y = Editor_state.top
1345   App.screen.check(y, 'abc ', 'screen:1')
1346   y = y + Editor_state.line_height
1347   App.screen.check(y, 'def', 'screen:2')
1348   y = y + Editor_state.line_height
1349   App.screen.check(y, 'ghi', 'screen:3')
1350 end
1351
1352 function test_pageup_scrolls_up_from_middle_screen_line()
1353   -- display a few lines starting from the middle of a line (Editor_state.cursor1.pos > 1)
1354   App.screen.init{width=Editor_state.left+30, height=60}
1355   Editor_state = edit.initialize_test_state()
1356   Editor_state.lines = load_array{'abc def', 'ghi jkl', 'mno'}
1357   Text.redraw_all(Editor_state)
1358   Editor_state.cursor1 = {line=2, pos=5}
1359   Editor_state.screen_top1 = {line=2, pos=5}
1360   edit.draw(Editor_state)
1361   local y = Editor_state.top
1362   App.screen.check(y, 'jkl', 'baseline/screen:2')
1363   y = y + Editor_state.line_height
1364   App.screen.check(y, 'mno', 'baseline/screen:3')  -- line wrapping includes trailing whitespace
1365   -- after hitting the page-up key the screen scrolls up to top
1366   edit.run_after_keychord(Editor_state, 'pageup', 'pageup')
1367   check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
1368   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
1369   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
1370   y = Editor_state.top
1371   App.screen.check(y, 'abc ', 'screen:1')
1372   y = y + Editor_state.line_height
1373   App.screen.check(y, 'def', 'screen:2')
1374   y = y + Editor_state.line_height
1375   App.screen.check(y, 'ghi ', 'screen:3')
1376 end
1377
1378 function test_enter_on_bottom_line_scrolls_down()
1379   -- display a few lines with cursor on bottom line
1380   App.screen.init{width=Editor_state.left+30, height=60}
1381   Editor_state = edit.initialize_test_state()
1382   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
1383   Text.redraw_all(Editor_state)
1384   Editor_state.cursor1 = {line=3, pos=2}
1385   Editor_state.screen_top1 = {line=1, pos=1}
1386   edit.draw(Editor_state)
1387   local y = Editor_state.top
1388   App.screen.check(y, 'abc', 'baseline/screen:1')
1389   y = y + Editor_state.line_height
1390   App.screen.check(y, 'def', 'baseline/screen:2')
1391   y = y + Editor_state.line_height
1392   App.screen.check(y, 'ghi', 'baseline/screen:3')
1393   -- after hitting the enter key the screen scrolls down
1394   edit.run_after_keychord(Editor_state, 'return', 'return')
1395   check_eq(Editor_state.screen_top1.line, 2, 'screen_top')
1396   check_eq(Editor_state.cursor1.line, 4, 'cursor:line')
1397   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
1398   y = Editor_state.top
1399   App.screen.check(y, 'def', 'screen:1')
1400   y = y + Editor_state.line_height
1401   App.screen.check(y, 'g', 'screen:2')
1402   y = y + Editor_state.line_height
1403   App.screen.check(y, 'hi', 'screen:3')
1404 end
1405
1406 function test_enter_on_final_line_avoids_scrolling_down_when_not_at_bottom()
1407   -- display just the bottom line on screen
1408   App.screen.init{width=Editor_state.left+30, height=60}
1409   Editor_state = edit.initialize_test_state()
1410   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
1411   Text.redraw_all(Editor_state)
1412   Editor_state.cursor1 = {line=4, pos=2}
1413   Editor_state.screen_top1 = {line=4, pos=1}
1414   edit.draw(Editor_state)
1415   local y = Editor_state.top
1416   App.screen.check(y, 'jkl', 'baseline/screen:1')
1417   -- after hitting the enter key the screen does not scroll down
1418   edit.run_after_keychord(Editor_state, 'return', 'return')
1419   check_eq(Editor_state.screen_top1.line, 4, 'screen_top')
1420   check_eq(Editor_state.cursor1.line, 5, 'cursor:line')
1421   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
1422   y = Editor_state.top
1423   App.screen.check(y, 'j', 'screen:1')
1424   y = y + Editor_state.line_height
1425   App.screen.check(y, 'kl', 'screen:2')
1426 end
1427
1428 function test_inserting_text_on_final_line_avoids_scrolling_down_when_not_at_bottom()
1429   -- display just an empty bottom line on screen
1430   App.screen.init{width=Editor_state.left+30, height=60}
1431   Editor_state = edit.initialize_test_state()
1432   Editor_state.lines = load_array{'abc', ''}
1433   Text.redraw_all(Editor_state)
1434   Editor_state.cursor1 = {line=2, pos=1}
1435   Editor_state.screen_top1 = {line=2, pos=1}
1436   edit.draw(Editor_state)
1437   -- after hitting the inserting_text key the screen does not scroll down
1438   edit.run_after_text_input(Editor_state, 'a')
1439   check_eq(Editor_state.screen_top1.line, 2, 'screen_top')
1440   check_eq(Editor_state.cursor1.line, 2, 'cursor:line')
1441   check_eq(Editor_state.cursor1.pos, 2, 'cursor:pos')
1442   local y = Editor_state.top
1443   App.screen.check(y, 'a', 'screen:1')
1444 end
1445
1446 function test_typing_on_bottom_line_scrolls_down()
1447   -- display a few lines with cursor on bottom line
1448   App.screen.init{width=Editor_state.left+30, height=60}
1449   Editor_state = edit.initialize_test_state()
1450   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
1451   Text.redraw_all(Editor_state)
1452   Editor_state.cursor1 = {line=3, pos=4}
1453   Editor_state.screen_top1 = {line=1, pos=1}
1454   edit.draw(Editor_state)
1455   local y = Editor_state.top
1456   App.screen.check(y, 'abc', 'baseline/screen:1')
1457   y = y + Editor_state.line_height
1458   App.screen.check(y, 'def', 'baseline/screen:2')
1459   y = y + Editor_state.line_height
1460   App.screen.check(y, 'ghi', 'baseline/screen:3')
1461   -- after typing something the line wraps and the screen scrolls down
1462   edit.run_after_text_input(Editor_state, 'j')
1463   edit.run_after_text_input(Editor_state, 'k')
1464   edit.run_after_text_input(Editor_state, 'l')
1465   check_eq(Editor_state.screen_top1.line, 2, 'screen_top')
1466   check_eq(Editor_state.cursor1.line, 3, 'cursor:line')
1467   check_eq(Editor_state.cursor1.pos, 7, 'cursor:pos')
1468   y = Editor_state.top
1469   App.screen.check(y, 'def', 'screen:1')
1470   y = y + Editor_state.line_height
1471   App.screen.check(y, 'ghij', 'screen:2')
1472   y = y + Editor_state.line_height
1473   App.screen.check(y, 'kl', 'screen:3')
1474 end
1475
1476 function test_left_arrow_scrolls_up_in_wrapped_line()
1477   -- display lines starting from second screen line of a line
1478   App.screen.init{width=Editor_state.left+30, height=60}
1479   Editor_state = edit.initialize_test_state()
1480   Editor_state.lines = load_array{'abc', 'def', 'ghi jkl', 'mno'}
1481   Text.redraw_all(Editor_state)
1482   Editor_state.screen_top1 = {line=3, pos=5}
1483   -- cursor is at top of screen
1484   Editor_state.cursor1 = {line=3, pos=5}
1485   edit.draw(Editor_state)
1486   local y = Editor_state.top
1487   App.screen.check(y, 'jkl', 'baseline/screen:1')
1488   y = y + Editor_state.line_height
1489   App.screen.check(y, 'mno', 'baseline/screen:2')
1490   -- after hitting the left arrow the screen scrolls up to first screen line
1491   edit.run_after_keychord(Editor_state, 'left', 'left')
1492   y = Editor_state.top
1493   App.screen.check(y, 'ghi ', 'screen:1')
1494   y = y + Editor_state.line_height
1495   App.screen.check(y, 'jkl', 'screen:2')
1496   y = y + Editor_state.line_height
1497   App.screen.check(y, 'mno', 'screen:3')
1498   check_eq(Editor_state.screen_top1.line, 3, 'screen_top:line')
1499   check_eq(Editor_state.screen_top1.pos, 1, 'screen_top:pos')
1500   check_eq(Editor_state.cursor1.line, 3, 'cursor:line')
1501   check_eq(Editor_state.cursor1.pos, 4, 'cursor:pos')
1502 end
1503
1504 function test_right_arrow_scrolls_down_in_wrapped_line()
1505   -- display the first three lines with the cursor on the bottom line
1506   App.screen.init{width=Editor_state.left+30, height=60}
1507   Editor_state = edit.initialize_test_state()
1508   Editor_state.lines = load_array{'abc', 'def', 'ghi jkl', 'mno'}
1509   Text.redraw_all(Editor_state)
1510   Editor_state.screen_top1 = {line=1, pos=1}
1511   -- cursor is at bottom right of screen
1512   Editor_state.cursor1 = {line=3, pos=5}
1513   edit.draw(Editor_state)
1514   local y = Editor_state.top
1515   App.screen.check(y, 'abc', 'baseline/screen:1')
1516   y = y + Editor_state.line_height
1517   App.screen.check(y, 'def', 'baseline/screen:2')
1518   y = y + Editor_state.line_height
1519   App.screen.check(y, 'ghi ', 'baseline/screen:3')  -- line wrapping includes trailing whitespace
1520   -- after hitting the right arrow the screen scrolls down by one line
1521   edit.run_after_keychord(Editor_state, 'right', 'right')
1522   check_eq(Editor_state.screen_top1.line, 2, 'screen_top')
1523   check_eq(Editor_state.cursor1.line, 3, 'cursor:line')
1524   check_eq(Editor_state.cursor1.pos, 6, 'cursor:pos')
1525   y = Editor_state.top
1526   App.screen.check(y, 'def', 'screen:1')
1527   y = y + Editor_state.line_height
1528   App.screen.check(y, 'ghi ', 'screen:2')
1529   y = y + Editor_state.line_height
1530   App.screen.check(y, 'jkl', 'screen:3')
1531 end
1532
1533 function test_home_scrolls_up_in_wrapped_line()
1534   -- display lines starting from second screen line of a line
1535   App.screen.init{width=Editor_state.left+30, height=60}
1536   Editor_state = edit.initialize_test_state()
1537   Editor_state.lines = load_array{'abc', 'def', 'ghi jkl', 'mno'}
1538   Text.redraw_all(Editor_state)
1539   Editor_state.screen_top1 = {line=3, pos=5}
1540   -- cursor is at top of screen
1541   Editor_state.cursor1 = {line=3, pos=5}
1542   edit.draw(Editor_state)
1543   local y = Editor_state.top
1544   App.screen.check(y, 'jkl', 'baseline/screen:1')
1545   y = y + Editor_state.line_height
1546   App.screen.check(y, 'mno', 'baseline/screen:2')
1547   -- after hitting home the screen scrolls up to first screen line
1548   edit.run_after_keychord(Editor_state, 'home', 'home')
1549   y = Editor_state.top
1550   App.screen.check(y, 'ghi ', 'screen:1')
1551   y = y + Editor_state.line_height
1552   App.screen.check(y, 'jkl', 'screen:2')
1553   y = y + Editor_state.line_height
1554   App.screen.check(y, 'mno', 'screen:3')
1555   check_eq(Editor_state.screen_top1.line, 3, 'screen_top:line')
1556   check_eq(Editor_state.screen_top1.pos, 1, 'screen_top:pos')
1557   check_eq(Editor_state.cursor1.line, 3, 'cursor:line')
1558   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
1559 end
1560
1561 function test_end_scrolls_down_in_wrapped_line()
1562   -- display the first three lines with the cursor on the bottom line
1563   App.screen.init{width=Editor_state.left+30, height=60}
1564   Editor_state = edit.initialize_test_state()
1565   Editor_state.lines = load_array{'abc', 'def', 'ghi jkl', 'mno'}
1566   Text.redraw_all(Editor_state)
1567   Editor_state.screen_top1 = {line=1, pos=1}
1568   -- cursor is at bottom right of screen
1569   Editor_state.cursor1 = {line=3, pos=5}
1570   edit.draw(Editor_state)
1571   local y = Editor_state.top
1572   App.screen.check(y, 'abc', 'baseline/screen:1')
1573   y = y + Editor_state.line_height
1574   App.screen.check(y, 'def', 'baseline/screen:2')
1575   y = y + Editor_state.line_height
1576   App.screen.check(y, 'ghi ', 'baseline/screen:3')  -- line wrapping includes trailing whitespace
1577   -- after hitting end the screen scrolls down by one line
1578   edit.run_after_keychord(Editor_state, 'end', 'end')
1579   check_eq(Editor_state.screen_top1.line, 2, 'screen_top')
1580   check_eq(Editor_state.cursor1.line, 3, 'cursor:line')
1581   check_eq(Editor_state.cursor1.pos, 8, 'cursor:pos')
1582   y = Editor_state.top
1583   App.screen.check(y, 'def', 'screen:1')
1584   y = y + Editor_state.line_height
1585   App.screen.check(y, 'ghi ', 'screen:2')
1586   y = y + Editor_state.line_height
1587   App.screen.check(y, 'jkl', 'screen:3')
1588 end
1589
1590 function test_position_cursor_on_recently_edited_wrapping_line()
1591   -- draw a line wrapping over 2 screen lines
1592   App.screen.init{width=100, height=200}
1593   Editor_state = edit.initialize_test_state()
1594   Editor_state.lines = load_array{'abc def ghi jkl mno pqr ', 'xyz'}
1595   Text.redraw_all(Editor_state)
1596   Editor_state.cursor1 = {line=1, pos=25}
1597   Editor_state.screen_top1 = {line=1, pos=1}
1598   edit.draw(Editor_state)
1599   local y = Editor_state.top
1600   App.screen.check(y, 'abc def ghi ', 'baseline1/screen:1')
1601   y = y + Editor_state.line_height
1602   App.screen.check(y, 'jkl mno pqr ', 'baseline1/screen:2')
1603   y = y + Editor_state.line_height
1604   App.screen.check(y, 'xyz', 'baseline1/screen:3')
1605   -- add to the line until it's wrapping over 3 screen lines
1606   edit.run_after_text_input(Editor_state, 's')
1607   edit.run_after_text_input(Editor_state, 't')
1608   edit.run_after_text_input(Editor_state, 'u')
1609   check_eq(Editor_state.cursor1.pos, 28, 'cursor:pos')
1610   y = Editor_state.top
1611   App.screen.check(y, 'abc def ghi ', 'baseline2/screen:1')
1612   y = y + Editor_state.line_height
1613   App.screen.check(y, 'jkl mno pqr ', 'baseline2/screen:2')
1614   y = y + Editor_state.line_height
1615   App.screen.check(y, 'stu', 'baseline2/screen:3')
1616   -- try to move the cursor earlier in the third screen line by clicking the mouse
1617   edit.run_after_mouse_release(Editor_state, Editor_state.left+2,Editor_state.top+Editor_state.line_height*2+5, 1)
1618   -- cursor should move
1619   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
1620   check_eq(Editor_state.cursor1.pos, 25, 'cursor:pos')
1621 end
1622
1623 function test_backspace_can_scroll_up()
1624   -- display the lines 2/3/4 with the cursor on line 2
1625   App.screen.init{width=120, height=60}
1626   Editor_state = edit.initialize_test_state()
1627   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl'}
1628   Text.redraw_all(Editor_state)
1629   Editor_state.cursor1 = {line=2, pos=1}
1630   Editor_state.screen_top1 = {line=2, pos=1}
1631   edit.draw(Editor_state)
1632   local y = Editor_state.top
1633   App.screen.check(y, 'def', 'baseline/screen:1')
1634   y = y + Editor_state.line_height
1635   App.screen.check(y, 'ghi', 'baseline/screen:2')
1636   y = y + Editor_state.line_height
1637   App.screen.check(y, 'jkl', 'baseline/screen:3')
1638   -- after hitting backspace the screen scrolls up by one line
1639   edit.run_after_keychord(Editor_state, 'backspace', 'backspace')
1640   check_eq(Editor_state.screen_top1.line, 1, 'screen_top')
1641   check_eq(Editor_state.cursor1.line, 1, 'cursor')
1642   y = Editor_state.top
1643   App.screen.check(y, 'abcdef', 'screen:1')
1644   y = y + Editor_state.line_height
1645   App.screen.check(y, 'ghi', 'screen:2')
1646   y = y + Editor_state.line_height
1647   App.screen.check(y, 'jkl', 'screen:3')
1648 end
1649
1650 function test_backspace_can_scroll_up_screen_line()
1651   -- display lines starting from second screen line of a line
1652   App.screen.init{width=Editor_state.left+30, height=60}
1653   Editor_state = edit.initialize_test_state()
1654   Editor_state.lines = load_array{'abc', 'def', 'ghi jkl', 'mno'}
1655   Text.redraw_all(Editor_state)
1656   Editor_state.cursor1 = {line=3, pos=5}
1657   Editor_state.screen_top1 = {line=3, pos=5}
1658   edit.draw(Editor_state)
1659   local y = Editor_state.top
1660   App.screen.check(y, 'jkl', 'baseline/screen:1')
1661   y = y + Editor_state.line_height
1662   App.screen.check(y, 'mno', 'baseline/screen:2')
1663   -- after hitting backspace the screen scrolls up by one screen line
1664   edit.run_after_keychord(Editor_state, 'backspace', 'backspace')
1665   y = Editor_state.top
1666   App.screen.check(y, 'ghij', 'screen:1')
1667   y = y + Editor_state.line_height
1668   App.screen.check(y, 'kl', 'screen:2')
1669   y = y + Editor_state.line_height
1670   App.screen.check(y, 'mno', 'screen:3')
1671   check_eq(Editor_state.screen_top1.line, 3, 'screen_top:line')
1672   check_eq(Editor_state.screen_top1.pos, 1, 'screen_top:pos')
1673   check_eq(Editor_state.cursor1.line, 3, 'cursor:line')
1674   check_eq(Editor_state.cursor1.pos, 4, 'cursor:pos')
1675 end
1676
1677 function test_backspace_past_line_boundary()
1678   -- position cursor at start of a (non-first) line
1679   App.screen.init{width=Editor_state.left+30, height=60}
1680   Editor_state = edit.initialize_test_state()
1681   Editor_state.lines = load_array{'abc', 'def'}
1682   Text.redraw_all(Editor_state)
1683   Editor_state.cursor1 = {line=2, pos=1}
1684   -- backspace joins with previous line
1685   edit.run_after_keychord(Editor_state, 'backspace', 'backspace')
1686   check_eq(Editor_state.lines[1].data, 'abcdef', 'check')
1687 end
1688
1689 -- some tests for operating over selections created using Shift- chords
1690 -- we're just testing delete_selection, and it works the same for all keys
1691
1692 function test_backspace_over_selection()
1693   -- select just one character within a line with cursor before selection
1694   App.screen.init{width=Editor_state.left+30, height=60}
1695   Editor_state = edit.initialize_test_state()
1696   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl', 'mno'}
1697   Text.redraw_all(Editor_state)
1698   Editor_state.cursor1 = {line=1, pos=1}
1699   Editor_state.selection1 = {line=1, pos=2}
1700   -- backspace deletes the selected character, even though it's after the cursor
1701   edit.run_after_keychord(Editor_state, 'backspace', 'backspace')
1702   check_eq(Editor_state.lines[1].data, 'bc', 'data')
1703   -- cursor (remains) at start of selection
1704   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
1705   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
1706   -- selection is cleared
1707   check_nil(Editor_state.selection1.line, 'selection')
1708 end
1709
1710 function test_backspace_over_selection_reverse()
1711   -- select just one character within a line with cursor after selection
1712   App.screen.init{width=Editor_state.left+30, height=60}
1713   Editor_state = edit.initialize_test_state()
1714   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl', 'mno'}
1715   Text.redraw_all(Editor_state)
1716   Editor_state.cursor1 = {line=1, pos=2}
1717   Editor_state.selection1 = {line=1, pos=1}
1718   -- backspace deletes the selected character
1719   edit.run_after_keychord(Editor_state, 'backspace', 'backspace')
1720   check_eq(Editor_state.lines[1].data, 'bc', 'data')
1721   -- cursor moves to start of selection
1722   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
1723   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
1724   -- selection is cleared
1725   check_nil(Editor_state.selection1.line, 'selection')
1726 end
1727
1728 function test_backspace_over_multiple_lines()
1729   -- select just one character within a line with cursor after selection
1730   App.screen.init{width=Editor_state.left+30, height=60}
1731   Editor_state = edit.initialize_test_state()
1732   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl', 'mno'}
1733   Text.redraw_all(Editor_state)
1734   Editor_state.cursor1 = {line=1, pos=2}
1735   Editor_state.selection1 = {line=4, pos=2}
1736   -- backspace deletes the region and joins the remaining portions of lines on either side
1737   edit.run_after_keychord(Editor_state, 'backspace', 'backspace')
1738   check_eq(Editor_state.lines[1].data, 'akl', 'data:1')
1739   check_eq(Editor_state.lines[2].data, 'mno', 'data:2')
1740   -- cursor remains at start of selection
1741   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
1742   check_eq(Editor_state.cursor1.pos, 2, 'cursor:pos')
1743   -- selection is cleared
1744   check_nil(Editor_state.selection1.line, 'selection')
1745 end
1746
1747 function test_backspace_to_end_of_line()
1748   -- select region from cursor to end of line
1749   App.screen.init{width=Editor_state.left+30, height=60}
1750   Editor_state = edit.initialize_test_state()
1751   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl', 'mno'}
1752   Text.redraw_all(Editor_state)
1753   Editor_state.cursor1 = {line=1, pos=2}
1754   Editor_state.selection1 = {line=1, pos=4}
1755   -- backspace deletes rest of line without joining to any other line
1756   edit.run_after_keychord(Editor_state, 'backspace', 'backspace')
1757   check_eq(Editor_state.lines[1].data, 'a', 'data:1')
1758   check_eq(Editor_state.lines[2].data, 'def', 'data:2')
1759   -- cursor remains at start of selection
1760   check_eq(Editor_state.cursor1.line, 1, 'cursor:line')
1761   check_eq(Editor_state.cursor1.pos, 2, 'cursor:pos')
1762   -- selection is cleared
1763   check_nil(Editor_state.selection1.line, 'selection')
1764 end
1765
1766 function test_backspace_to_start_of_line()
1767   -- select region from cursor to start of line
1768   App.screen.init{width=Editor_state.left+30, height=60}
1769   Editor_state = edit.initialize_test_state()
1770   Editor_state.lines = load_array{'abc', 'def', 'ghi', 'jkl', 'mno'}
1771   Text.redraw_all(Editor_state)
1772   Editor_state.cursor1 = {line=2, pos=1}
1773   Editor_state.selection1 = {line=2, pos=3}
1774   -- backspace deletes beginning of line without joining to any other line
1775   edit.run_after_keychord(Editor_state, 'backspace', 'backspace')
1776   check_eq(Editor_state.lines[1].data, 'abc', 'data:1')
1777   check_eq(Editor_state.lines[2].data, 'f', 'data:2')
1778   -- cursor remains at start of selection
1779   check_eq(Editor_state.cursor1.line, 2, 'cursor:line')
1780   check_eq(Editor_state.cursor1.pos, 1, 'cursor:pos')
1781   -- selection is cleared
1782   check_nil(Editor_state.selection1.line, 'selection')
1783 end
1784
1785 function test_undo_insert_text()
1786   App.screen.init{width=120, height=60}
1787   Editor_state = edit.initialize_test_state()
1788   Editor_state.lines = load_array{'abc', 'def', 'xyz'}
1789   Text.redraw_all(Editor_state)
1790   Editor_state.cursor1 = {line=2, pos=4}
1791   Editor_state.screen_top1 = {line=1, pos=1}
1792   -- insert a character
1793   edit.draw(Editor_state)
1794   edit.run_after_text_input(Editor_state, 'g')
1795   check_eq(Editor_state.cursor1.line, 2, 'baseline/cursor:line')
1796   check_eq(Editor_state.cursor1.pos, 5, 'baseline/cursor:pos')
1797   check_nil(Editor_state.selection1.line, 'baseline/selection:line')
1798   check_nil(Editor_state.selection1.pos, 'baseline/selection:pos')
1799   local y = Editor_state.top
1800   App.screen.check(y, 'abc', 'baseline/screen:1')
1801   y = y + Editor_state.line_height
1802   App.screen.check(y, 'defg', 'baseline/screen:2')
1803   y = y + Editor_state.line_height
1804   App.screen.check(y, 'xyz', 'baseline/screen:3')
1805   -- undo
1806   edit.run_after_keychord(Editor_state, 'C-z', 'z')
1807   check_eq(Editor_state.cursor1.line, 2, 'cursor:line')
1808   check_eq(Editor_state.cursor1.pos, 4, 'cursor:pos')
1809   check_nil(Editor_state.selection1.line, 'selection:line')
1810   check_nil(Editor_state.selection1.pos, 'selection:pos')
1811   y = Editor_state.top
1812   App.screen.check(y, 'abc', 'screen:1')
1813   y = y + Editor_state.line_height
1814   App.screen.check(y, 'def', 'screen:2')
1815   y = y + Editor_state.line_height
1816   App.screen.check(y, 'xyz', 'screen:3')
1817 end
1818
1819 function test_undo_delete_text()
1820   App.screen.init{width=120, height=60}
1821   Editor_state = edit.initialize_test_state()
1822   Editor_state.lines = load_array{'abc', 'defg', 'xyz'}
1823   Text.redraw_all(Editor_state)
1824   Editor_state.cursor1 = {line=2, pos=5}
1825   Editor_state.screen_top1 = {line=1, pos=1}
1826   -- delete a character
1827   edit.run_after_keychord(Editor_state, 'backspace', 'backspace')
1828   check_eq(Editor_state.cursor1.line, 2, 'baseline/cursor:line')
1829   check_eq(Editor_state.cursor1.pos, 4, 'baseline/cursor:pos')
1830   check_nil(Editor_state.selection1.line, 'baseline/selection:line')
1831   check_nil(Editor_state.selection1.pos, 'baseline/selection:pos')
1832   local y = Editor_state.top
1833   App.screen.check(y, 'abc', 'baseline/screen:1')
1834   y = y + Editor_state.line_height
1835   App.screen.check(y, 'def', 'baseline/screen:2')
1836   y = y + Editor_state.line_height
1837   App.screen.check(y, 'xyz', 'baseline/screen:3')
1838   -- undo
1839 --?   -- after undo, the backspaced key is selected
1840   edit.run_after_keychord(Editor_state, 'C-z', 'z')
1841   check_eq(Editor_state.cursor1.line, 2, 'cursor:line')
1842   check_eq(Editor_state.cursor1.pos, 5, 'cursor:pos')
1843   check_nil(Editor_state.selection1.line, 'selection:line')
1844   check_nil(Editor_state.selection1.pos, 'selection:pos')
1845 --?   check_eq(Editor_state.selection1.line, 2, 'selection:line')
1846 --?   check_eq(Editor_state.selection1.pos, 4, 'selection:pos')
1847   y = Editor_state.top
1848   App.screen.check(y, 'abc', 'screen:1')
1849   y = y + Editor_state.line_height
1850   App.screen.check(y, 'defg', 'screen:2')
1851   y = y + Editor_state.line_height
1852   App.screen.check(y, 'xyz', 'screen:3')
1853 end
1854
1855 function test_undo_restores_selection()
1856   -- display a line of text with some part selected
1857   App.screen.init{width=75, height=80}
1858   Editor_state = edit.initialize_test_state()
1859   Editor_state.lines = load_array{'abc'}
1860   Text.redraw_all(Editor_state)
1861   Editor_state.cursor1 = {line=1, pos=1}
1862   Editor_state.selection1 = {line=1, pos=2}
1863   Editor_state.screen_top1 = {line=1, pos=1}
1864   edit.draw(Editor_state)
1865   -- delete selected text
1866   edit.run_after_text_input(Editor_state, 'x')
1867   check_eq(Editor_state.lines[1].data, 'xbc', 'baseline')
1868   check_nil(Editor_state.selection1.line, 'baseline:selection')
1869   -- undo
1870   edit.run_after_keychord(Editor_state, 'C-z', 'z')
1871   edit.run_after_keychord(Editor_state, 'C-z', 'z')
1872   -- selection is restored
1873   check_eq(Editor_state.selection1.line, 1, 'line')
1874   check_eq(Editor_state.selection1.pos, 2, 'pos')
1875 end
1876
1877 function test_search()
1878   App.screen.init{width=120, height=60}
1879   Editor_state = edit.initialize_test_state()
1880   Editor_state.lines = load_array{'abc', 'def', 'ghi', '’deg'}  -- contains unicode quote in final line
1881   Text.redraw_all(Editor_state)
1882   Editor_state.cursor1 = {line=1, pos=1}
1883   Editor_state.screen_top1 = {line=1, pos=1}
1884   edit.draw(Editor_state)
1885   -- search for a string
1886   edit.run_after_keychord(Editor_state, 'C-f', 'f')
1887   edit.run_after_text_input(Editor_state, 'd')
1888   edit.run_after_keychord(Editor_state, 'return', 'return')
1889   check_eq(Editor_state.cursor1.line, 2, '1/cursor:line')
1890   check_eq(Editor_state.cursor1.pos, 1, '1/cursor:pos')
1891   -- reset cursor
1892   Editor_state.cursor1 = {line=1, pos=1}
1893   Editor_state.screen_top1 = {line=1, pos=1}
1894   -- search for second occurrence
1895   edit.run_after_keychord(Editor_state, 'C-f', 'f')
1896   edit.run_after_text_input(Editor_state, 'de')
1897   edit.run_after_keychord(Editor_state, 'down', 'down')
1898   edit.run_after_keychord(Editor_state, 'return', 'return')
1899   check_eq(Editor_state.cursor1.line, 4, '2/cursor:line')
1900   check_eq(Editor_state.cursor1.pos, 2, '2/cursor:pos')
1901 end
1902
1903 function test_search_upwards()
1904   App.screen.init{width=120, height=60}
1905   Editor_state = edit.initialize_test_state()
1906   Editor_state.lines = load_array{'’abc', 'abd'}  -- contains unicode quote
1907   Text.redraw_all(Editor_state)
1908   Editor_state.cursor1 = {line=2, pos=1}
1909   Editor_state.screen_top1 = {line=1, pos=1}
1910   edit.draw(Editor_state)
1911   -- search for a string
1912   edit.run_after_keychord(Editor_state, 'C-f', 'f')
1913   edit.run_after_text_input(Editor_state, 'a')
1914   -- search for previous occurrence
1915   edit.run_after_keychord(Editor_state, 'up', 'up')
1916   check_eq(Editor_state.cursor1.line, 1, '2/cursor:line')
1917   check_eq(Editor_state.cursor1.pos, 2, '2/cursor:pos')
1918 end
1919
1920 function test_search_wrap()
1921   App.screen.init{width=120, height=60}
1922   Editor_state = edit.initialize_test_state()
1923   Editor_state.lines = load_array{'’abc', 'def'}  -- contains unicode quote in first line
1924   Text.redraw_all(Editor_state)
1925   Editor_state.cursor1 = {line=2, pos=1}
1926   Editor_state.screen_top1 = {line=1, pos=1}
1927   edit.draw(Editor_state)
1928   -- search for a string
1929   edit.run_after_keychord(Editor_state, 'C-f', 'f')
1930   edit.run_after_text_input(Editor_state, 'a')
1931   edit.run_after_keychord(Editor_state, 'return', 'return')
1932   -- cursor wraps
1933   check_eq(Editor_state.cursor1.line, 1, '1/cursor:line')
1934   check_eq(Editor_state.cursor1.pos, 2, '1/cursor:pos')
1935 end
1936
1937 function test_search_wrap_upwards()
1938   App.screen.init{width=120, height=60}
1939   Editor_state = edit.initialize_test_state()
1940   Editor_state.lines = load_array{'abc ’abd'}  -- contains unicode quote
1941   Text.redraw_all(Editor_state)
1942   Editor_state.cursor1 = {line=1, pos=1}
1943   Editor_state.screen_top1 = {line=1, pos=1}
1944   edit.draw(Editor_state)
1945   -- search upwards for a string
1946   edit.run_after_keychord(Editor_state, 'C-f', 'f')
1947   edit.run_after_text_input(Editor_state, 'a')
1948   edit.run_after_keychord(Editor_state, 'up', 'up')
1949   -- cursor wraps
1950   check_eq(Editor_state.cursor1.line, 1, '1/cursor:line')
1951   check_eq(Editor_state.cursor1.pos, 6, '1/cursor:pos')
1952 end
1953
1954 function test_search_downwards_from_end_of_line()
1955   App.screen.init{width=120, height=60}
1956   Editor_state = edit.initialize_test_state()
1957   Editor_state.lines = load_array{'abc', 'def', 'ghi'}
1958   Text.redraw_all(Editor_state)
1959   Editor_state.cursor1 = {line=1, pos=4}
1960   Editor_state.screen_top1 = {line=1, pos=1}
1961   edit.draw(Editor_state)
1962   -- search for empty string
1963   edit.run_after_keychord(Editor_state, 'C-f', 'f')
1964   edit.run_after_keychord(Editor_state, 'down', 'down')
1965   -- no crash
1966 end
1967
1968 function test_search_downwards_from_final_pos_of_line()
1969   App.screen.init{width=120, height=60}
1970   Editor_state = edit.initialize_test_state()
1971   Editor_state.lines = load_array{'abc', 'def', 'ghi'}
1972   Text.redraw_all(Editor_state)
1973   Editor_state.cursor1 = {line=1, pos=3}
1974   Editor_state.screen_top1 = {line=1, pos=1}
1975   edit.draw(Editor_state)
1976   -- search for empty string
1977   edit.run_after_keychord(Editor_state, 'C-f', 'f')
1978   edit.run_after_keychord(Editor_state, 'down', 'down')
1979   -- no crash
1980 end