base/string_piece_unittest.cc

   1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <string>
   6
   7 #include "base/string16.h"
   8 #include "base/string_piece.h"
   9 #include "base/utf_string_conversions.h"
  10 #include "testing/gtest/include/gtest/gtest.h"
  11
  12 namespace base {
  13
  14 TEST(StringPieceTest, CheckComparisonOperators) {
  15 #define CMP_Y(op, x, y)                                               \
  16   ASSERT_TRUE( (StringPiece((x)) op StringPiece((y))));               \
  17   ASSERT_TRUE( (StringPiece((x)).compare(StringPiece((y))) op 0))
  18
  19 #define CMP_N(op, x, y)                                          \
  20   ASSERT_FALSE(StringPiece((x)) op StringPiece((y)));               \
  21   ASSERT_FALSE(StringPiece((x)).compare(StringPiece((y))) op 0)
  22
  23   CMP_Y(==, "",   "");
  24   CMP_Y(==, "a",  "a");
  25   CMP_Y(==, "aa", "aa");
  26   CMP_N(==, "a",  "");
  27   CMP_N(==, "",   "a");
  28   CMP_N(==, "a",  "b");
  29   CMP_N(==, "a",  "aa");
  30   CMP_N(==, "aa", "a");
  31
  32   CMP_N(!=, "",   "");
  33   CMP_N(!=, "a",  "a");
  34   CMP_N(!=, "aa", "aa");
  35   CMP_Y(!=, "a",  "");
  36   CMP_Y(!=, "",   "a");
  37   CMP_Y(!=, "a",  "b");
  38   CMP_Y(!=, "a",  "aa");
  39   CMP_Y(!=, "aa", "a");
  40
  41   CMP_Y(<, "a",  "b");
  42   CMP_Y(<, "a",  "aa");
  43   CMP_Y(<, "aa", "b");
  44   CMP_Y(<, "aa", "bb");
  45   CMP_N(<, "a",  "a");
  46   CMP_N(<, "b",  "a");
  47   CMP_N(<, "aa", "a");
  48   CMP_N(<, "b",  "aa");
  49   CMP_N(<, "bb", "aa");
  50
  51   CMP_Y(<=, "a",  "a");
  52   CMP_Y(<=, "a",  "b");
  53   CMP_Y(<=, "a",  "aa");
  54   CMP_Y(<=, "aa", "b");
  55   CMP_Y(<=, "aa", "bb");
  56   CMP_N(<=, "b",  "a");
  57   CMP_N(<=, "aa", "a");
  58   CMP_N(<=, "b",  "aa");
  59   CMP_N(<=, "bb", "aa");
  60
  61   CMP_N(>=, "a",  "b");
  62   CMP_N(>=, "a",  "aa");
  63   CMP_N(>=, "aa", "b");
  64   CMP_N(>=, "aa", "bb");
  65   CMP_Y(>=, "a",  "a");
  66   CMP_Y(>=, "b",  "a");
  67   CMP_Y(>=, "aa", "a");
  68   CMP_Y(>=, "b",  "aa");
  69   CMP_Y(>=, "bb", "aa");
  70
  71   CMP_N(>, "a",  "a");
  72   CMP_N(>, "a",  "b");
  73   CMP_N(>, "a",  "aa");
  74   CMP_N(>, "aa", "b");
  75   CMP_N(>, "aa", "bb");
  76   CMP_Y(>, "b",  "a");
  77   CMP_Y(>, "aa", "a");
  78   CMP_Y(>, "b",  "aa");
  79   CMP_Y(>, "bb", "aa");
  80
  81   std::string x;
  82   for (int i = 0; i < 256; i++) {
  83     x += 'a';
  84     std::string y = x;
  85     CMP_Y(==, x, y);
  86     for (int j = 0; j < i; j++) {
  87       std::string z = x;
  88       z[j] = 'b';       // Differs in position 'j'
  89       CMP_N(==, x, z);
  90     }
  91   }
  92
  93 #undef CMP_Y
  94 #undef CMP_N
  95 }
  96
  97 TEST(StringPieceTest, CheckSTL) {
  98   StringPiece a("abcdefghijklmnopqrstuvwxyz");
  99   StringPiece b("abc");
 100   StringPiece c("xyz");
 101   StringPiece d("foobar");
 102   StringPiece e;
 103   std::string temp("123");
 104   temp += '\0';
 105   temp += "456";
 106   StringPiece f(temp);
 107
 108   ASSERT_EQ(a[6], 'g');
 109   ASSERT_EQ(b[0], 'a');
 110   ASSERT_EQ(c[2], 'z');
 111   ASSERT_EQ(f[3], '\0');
 112   ASSERT_EQ(f[5], '5');
 113
 114   ASSERT_EQ(*d.data(), 'f');
 115   ASSERT_EQ(d.data()[5], 'r');
 116   ASSERT_TRUE(e.data() == NULL);
 117
 118   ASSERT_EQ(*a.begin(), 'a');
 119   ASSERT_EQ(*(b.begin() + 2), 'c');
 120   ASSERT_EQ(*(c.end() - 1), 'z');
 121
 122   ASSERT_EQ(*a.rbegin(), 'z');
 123   ASSERT_EQ(*(b.rbegin() + 2), 'a');
 124   ASSERT_EQ(*(c.rend() - 1), 'x');
 125   ASSERT_TRUE(a.rbegin() + 26 == a.rend());
 126
 127   ASSERT_EQ(a.size(), 26U);
 128   ASSERT_EQ(b.size(), 3U);
 129   ASSERT_EQ(c.size(), 3U);
 130   ASSERT_EQ(d.size(), 6U);
 131   ASSERT_EQ(e.size(), 0U);
 132   ASSERT_EQ(f.size(), 7U);
 133
 134   ASSERT_TRUE(!d.empty());
 135   ASSERT_TRUE(d.begin() != d.end());
 136   ASSERT_TRUE(d.begin() + 6 == d.end());
 137
 138   ASSERT_TRUE(e.empty());
 139   ASSERT_TRUE(e.begin() == e.end());
 140
 141   d.clear();
 142   ASSERT_EQ(d.size(), 0U);
 143   ASSERT_TRUE(d.empty());
 144   ASSERT_TRUE(d.data() == NULL);
 145   ASSERT_TRUE(d.begin() == d.end());
 146
 147   ASSERT_GE(a.max_size(), a.capacity());
 148   ASSERT_GE(a.capacity(), a.size());
 149
 150   char buf[4] = { '%', '%', '%', '%' };
 151   ASSERT_EQ(a.copy(buf, 4), 4U);
 152   ASSERT_EQ(buf[0], a[0]);
 153   ASSERT_EQ(buf[1], a[1]);
 154   ASSERT_EQ(buf[2], a[2]);
 155   ASSERT_EQ(buf[3], a[3]);
 156   ASSERT_EQ(a.copy(buf, 3, 7), 3U);
 157   ASSERT_EQ(buf[0], a[7]);
 158   ASSERT_EQ(buf[1], a[8]);
 159   ASSERT_EQ(buf[2], a[9]);
 160   ASSERT_EQ(buf[3], a[3]);
 161   ASSERT_EQ(c.copy(buf, 99), 3U);
 162   ASSERT_EQ(buf[0], c[0]);
 163   ASSERT_EQ(buf[1], c[1]);
 164   ASSERT_EQ(buf[2], c[2]);
 165   ASSERT_EQ(buf[3], a[3]);
 166
 167   ASSERT_EQ(StringPiece::npos, std::string::npos);
 168
 169   ASSERT_EQ(a.find(b), 0U);
 170   ASSERT_EQ(a.find(b, 1), StringPiece::npos);
 171   ASSERT_EQ(a.find(c), 23U);
 172   ASSERT_EQ(a.find(c, 9), 23U);
 173   ASSERT_EQ(a.find(c, StringPiece::npos), StringPiece::npos);
 174   ASSERT_EQ(b.find(c), StringPiece::npos);
 175   ASSERT_EQ(b.find(c, StringPiece::npos), StringPiece::npos);
 176   ASSERT_EQ(a.find(d), 0U);
 177   ASSERT_EQ(a.find(e), 0U);
 178   ASSERT_EQ(a.find(d, 12), 12U);
 179   ASSERT_EQ(a.find(e, 17), 17U);
 180   StringPiece g("xx not found bb");
 181   ASSERT_EQ(a.find(g), StringPiece::npos);
 182   // empty string nonsense
 183   ASSERT_EQ(d.find(b), StringPiece::npos);
 184   ASSERT_EQ(e.find(b), StringPiece::npos);
 185   ASSERT_EQ(d.find(b, 4), StringPiece::npos);
 186   ASSERT_EQ(e.find(b, 7), StringPiece::npos);
 187
 188   size_t empty_search_pos = std::string().find(std::string());
 189   ASSERT_EQ(d.find(d), empty_search_pos);
 190   ASSERT_EQ(d.find(e), empty_search_pos);
 191   ASSERT_EQ(e.find(d), empty_search_pos);
 192   ASSERT_EQ(e.find(e), empty_search_pos);
 193   ASSERT_EQ(d.find(d, 4), std::string().find(std::string(), 4));
 194   ASSERT_EQ(d.find(e, 4), std::string().find(std::string(), 4));
 195   ASSERT_EQ(e.find(d, 4), std::string().find(std::string(), 4));
 196   ASSERT_EQ(e.find(e, 4), std::string().find(std::string(), 4));
 197
 198   ASSERT_EQ(a.find('a'), 0U);
 199   ASSERT_EQ(a.find('c'), 2U);
 200   ASSERT_EQ(a.find('z'), 25U);
 201   ASSERT_EQ(a.find('$'), StringPiece::npos);
 202   ASSERT_EQ(a.find('\0'), StringPiece::npos);
 203   ASSERT_EQ(f.find('\0'), 3U);
 204   ASSERT_EQ(f.find('3'), 2U);
 205   ASSERT_EQ(f.find('5'), 5U);
 206   ASSERT_EQ(g.find('o'), 4U);
 207   ASSERT_EQ(g.find('o', 4), 4U);
 208   ASSERT_EQ(g.find('o', 5), 8U);
 209   ASSERT_EQ(a.find('b', 5), StringPiece::npos);
 210   // empty string nonsense
 211   ASSERT_EQ(d.find('\0'), StringPiece::npos);
 212   ASSERT_EQ(e.find('\0'), StringPiece::npos);
 213   ASSERT_EQ(d.find('\0', 4), StringPiece::npos);
 214   ASSERT_EQ(e.find('\0', 7), StringPiece::npos);
 215   ASSERT_EQ(d.find('x'), StringPiece::npos);
 216   ASSERT_EQ(e.find('x'), StringPiece::npos);
 217   ASSERT_EQ(d.find('x', 4), StringPiece::npos);
 218   ASSERT_EQ(e.find('x', 7), StringPiece::npos);
 219
 220   ASSERT_EQ(a.rfind(b), 0U);
 221   ASSERT_EQ(a.rfind(b, 1), 0U);
 222   ASSERT_EQ(a.rfind(c), 23U);
 223   ASSERT_EQ(a.rfind(c, 22U), StringPiece::npos);
 224   ASSERT_EQ(a.rfind(c, 1U), StringPiece::npos);
 225   ASSERT_EQ(a.rfind(c, 0U), StringPiece::npos);
 226   ASSERT_EQ(b.rfind(c), StringPiece::npos);
 227   ASSERT_EQ(b.rfind(c, 0U), StringPiece::npos);
 228   ASSERT_EQ(a.rfind(d), (size_t) a.as_string().rfind(std::string()));
 229   ASSERT_EQ(a.rfind(e), a.as_string().rfind(std::string()));
 230   ASSERT_EQ(a.rfind(d, 12), 12U);
 231   ASSERT_EQ(a.rfind(e, 17), 17U);
 232   ASSERT_EQ(a.rfind(g), StringPiece::npos);
 233   ASSERT_EQ(d.rfind(b), StringPiece::npos);
 234   ASSERT_EQ(e.rfind(b), StringPiece::npos);
 235   ASSERT_EQ(d.rfind(b, 4), StringPiece::npos);
 236   ASSERT_EQ(e.rfind(b, 7), StringPiece::npos);
 237   // empty string nonsense
 238   ASSERT_EQ(d.rfind(d, 4), std::string().rfind(std::string()));
 239   ASSERT_EQ(e.rfind(d, 7), std::string().rfind(std::string()));
 240   ASSERT_EQ(d.rfind(e, 4), std::string().rfind(std::string()));
 241   ASSERT_EQ(e.rfind(e, 7), std::string().rfind(std::string()));
 242   ASSERT_EQ(d.rfind(d), std::string().rfind(std::string()));
 243   ASSERT_EQ(e.rfind(d), std::string().rfind(std::string()));
 244   ASSERT_EQ(d.rfind(e), std::string().rfind(std::string()));
 245   ASSERT_EQ(e.rfind(e), std::string().rfind(std::string()));
 246
 247   ASSERT_EQ(g.rfind('o'), 8U);
 248   ASSERT_EQ(g.rfind('q'), StringPiece::npos);
 249   ASSERT_EQ(g.rfind('o', 8), 8U);
 250   ASSERT_EQ(g.rfind('o', 7), 4U);
 251   ASSERT_EQ(g.rfind('o', 3), StringPiece::npos);
 252   ASSERT_EQ(f.rfind('\0'), 3U);
 253   ASSERT_EQ(f.rfind('\0', 12), 3U);
 254   ASSERT_EQ(f.rfind('3'), 2U);
 255   ASSERT_EQ(f.rfind('5'), 5U);
 256   // empty string nonsense
 257   ASSERT_EQ(d.rfind('o'), StringPiece::npos);
 258   ASSERT_EQ(e.rfind('o'), StringPiece::npos);
 259   ASSERT_EQ(d.rfind('o', 4), StringPiece::npos);
 260   ASSERT_EQ(e.rfind('o', 7), StringPiece::npos);
 261
 262   ASSERT_EQ(a.find_first_of(b), 0U);
 263   ASSERT_EQ(a.find_first_of(b, 0), 0U);
 264   ASSERT_EQ(a.find_first_of(b, 1), 1U);
 265   ASSERT_EQ(a.find_first_of(b, 2), 2U);
 266   ASSERT_EQ(a.find_first_of(b, 3), StringPiece::npos);
 267   ASSERT_EQ(a.find_first_of(c), 23U);
 268   ASSERT_EQ(a.find_first_of(c, 23), 23U);
 269   ASSERT_EQ(a.find_first_of(c, 24), 24U);
 270   ASSERT_EQ(a.find_first_of(c, 25), 25U);
 271   ASSERT_EQ(a.find_first_of(c, 26), StringPiece::npos);
 272   ASSERT_EQ(g.find_first_of(b), 13U);
 273   ASSERT_EQ(g.find_first_of(c), 0U);
 274   ASSERT_EQ(a.find_first_of(f), StringPiece::npos);
 275   ASSERT_EQ(f.find_first_of(a), StringPiece::npos);
 276   // empty string nonsense
 277   ASSERT_EQ(a.find_first_of(d), StringPiece::npos);
 278   ASSERT_EQ(a.find_first_of(e), StringPiece::npos);
 279   ASSERT_EQ(d.find_first_of(b), StringPiece::npos);
 280   ASSERT_EQ(e.find_first_of(b), StringPiece::npos);
 281   ASSERT_EQ(d.find_first_of(d), StringPiece::npos);
 282   ASSERT_EQ(e.find_first_of(d), StringPiece::npos);
 283   ASSERT_EQ(d.find_first_of(e), StringPiece::npos);
 284   ASSERT_EQ(e.find_first_of(e), StringPiece::npos);
 285
 286   ASSERT_EQ(a.find_first_not_of(b), 3U);
 287   ASSERT_EQ(a.find_first_not_of(c), 0U);
 288   ASSERT_EQ(b.find_first_not_of(a), StringPiece::npos);
 289   ASSERT_EQ(c.find_first_not_of(a), StringPiece::npos);
 290   ASSERT_EQ(f.find_first_not_of(a), 0U);
 291   ASSERT_EQ(a.find_first_not_of(f), 0U);
 292   ASSERT_EQ(a.find_first_not_of(d), 0U);
 293   ASSERT_EQ(a.find_first_not_of(e), 0U);
 294   // empty string nonsense
 295   ASSERT_EQ(d.find_first_not_of(a), StringPiece::npos);
 296   ASSERT_EQ(e.find_first_not_of(a), StringPiece::npos);
 297   ASSERT_EQ(d.find_first_not_of(d), StringPiece::npos);
 298   ASSERT_EQ(e.find_first_not_of(d), StringPiece::npos);
 299   ASSERT_EQ(d.find_first_not_of(e), StringPiece::npos);
 300   ASSERT_EQ(e.find_first_not_of(e), StringPiece::npos);
 301
 302   StringPiece h("====");
 303   ASSERT_EQ(h.find_first_not_of('='), StringPiece::npos);
 304   ASSERT_EQ(h.find_first_not_of('=', 3), StringPiece::npos);
 305   ASSERT_EQ(h.find_first_not_of('\0'), 0U);
 306   ASSERT_EQ(g.find_first_not_of('x'), 2U);
 307   ASSERT_EQ(f.find_first_not_of('\0'), 0U);
 308   ASSERT_EQ(f.find_first_not_of('\0', 3), 4U);
 309   ASSERT_EQ(f.find_first_not_of('\0', 2), 2U);
 310   // empty string nonsense
 311   ASSERT_EQ(d.find_first_not_of('x'), StringPiece::npos);
 312   ASSERT_EQ(e.find_first_not_of('x'), StringPiece::npos);
 313   ASSERT_EQ(d.find_first_not_of('\0'), StringPiece::npos);
 314   ASSERT_EQ(e.find_first_not_of('\0'), StringPiece::npos);
 315
 316   //  StringPiece g("xx not found bb");
 317   StringPiece i("56");
 318   ASSERT_EQ(h.find_last_of(a), StringPiece::npos);
 319   ASSERT_EQ(g.find_last_of(a), g.size()-1);
 320   ASSERT_EQ(a.find_last_of(b), 2U);
 321   ASSERT_EQ(a.find_last_of(c), a.size()-1);
 322   ASSERT_EQ(f.find_last_of(i), 6U);
 323   ASSERT_EQ(a.find_last_of('a'), 0U);
 324   ASSERT_EQ(a.find_last_of('b'), 1U);
 325   ASSERT_EQ(a.find_last_of('z'), 25U);
 326   ASSERT_EQ(a.find_last_of('a', 5), 0U);
 327   ASSERT_EQ(a.find_last_of('b', 5), 1U);
 328   ASSERT_EQ(a.find_last_of('b', 0), StringPiece::npos);
 329   ASSERT_EQ(a.find_last_of('z', 25), 25U);
 330   ASSERT_EQ(a.find_last_of('z', 24), StringPiece::npos);
 331   ASSERT_EQ(f.find_last_of(i, 5), 5U);
 332   ASSERT_EQ(f.find_last_of(i, 6), 6U);
 333   ASSERT_EQ(f.find_last_of(a, 4), StringPiece::npos);
 334   // empty string nonsense
 335   ASSERT_EQ(f.find_last_of(d), StringPiece::npos);
 336   ASSERT_EQ(f.find_last_of(e), StringPiece::npos);
 337   ASSERT_EQ(f.find_last_of(d, 4), StringPiece::npos);
 338   ASSERT_EQ(f.find_last_of(e, 4), StringPiece::npos);
 339   ASSERT_EQ(d.find_last_of(d), StringPiece::npos);
 340   ASSERT_EQ(d.find_last_of(e), StringPiece::npos);
 341   ASSERT_EQ(e.find_last_of(d), StringPiece::npos);
 342   ASSERT_EQ(e.find_last_of(e), StringPiece::npos);
 343   ASSERT_EQ(d.find_last_of(f), StringPiece::npos);
 344   ASSERT_EQ(e.find_last_of(f), StringPiece::npos);
 345   ASSERT_EQ(d.find_last_of(d, 4), StringPiece::npos);
 346   ASSERT_EQ(d.find_last_of(e, 4), StringPiece::npos);
 347   ASSERT_EQ(e.find_last_of(d, 4), StringPiece::npos);
 348   ASSERT_EQ(e.find_last_of(e, 4), StringPiece::npos);
 349   ASSERT_EQ(d.find_last_of(f, 4), StringPiece::npos);
 350   ASSERT_EQ(e.find_last_of(f, 4), StringPiece::npos);
 351
 352   ASSERT_EQ(a.find_last_not_of(b), a.size()-1);
 353   ASSERT_EQ(a.find_last_not_of(c), 22U);
 354   ASSERT_EQ(b.find_last_not_of(a), StringPiece::npos);
 355   ASSERT_EQ(b.find_last_not_of(b), StringPiece::npos);
 356   ASSERT_EQ(f.find_last_not_of(i), 4U);
 357   ASSERT_EQ(a.find_last_not_of(c, 24), 22U);
 358   ASSERT_EQ(a.find_last_not_of(b, 3), 3U);
 359   ASSERT_EQ(a.find_last_not_of(b, 2), StringPiece::npos);
 360   // empty string nonsense
 361   ASSERT_EQ(f.find_last_not_of(d), f.size()-1);
 362   ASSERT_EQ(f.find_last_not_of(e), f.size()-1);
 363   ASSERT_EQ(f.find_last_not_of(d, 4), 4U);
 364   ASSERT_EQ(f.find_last_not_of(e, 4), 4U);
 365   ASSERT_EQ(d.find_last_not_of(d), StringPiece::npos);
 366   ASSERT_EQ(d.find_last_not_of(e), StringPiece::npos);
 367   ASSERT_EQ(e.find_last_not_of(d), StringPiece::npos);
 368   ASSERT_EQ(e.find_last_not_of(e), StringPiece::npos);
 369   ASSERT_EQ(d.find_last_not_of(f), StringPiece::npos);
 370   ASSERT_EQ(e.find_last_not_of(f), StringPiece::npos);
 371   ASSERT_EQ(d.find_last_not_of(d, 4), StringPiece::npos);
 372   ASSERT_EQ(d.find_last_not_of(e, 4), StringPiece::npos);
 373   ASSERT_EQ(e.find_last_not_of(d, 4), StringPiece::npos);
 374   ASSERT_EQ(e.find_last_not_of(e, 4), StringPiece::npos);
 375   ASSERT_EQ(d.find_last_not_of(f, 4), StringPiece::npos);
 376   ASSERT_EQ(e.find_last_not_of(f, 4), StringPiece::npos);
 377
 378   ASSERT_EQ(h.find_last_not_of('x'), h.size() - 1);
 379   ASSERT_EQ(h.find_last_not_of('='), StringPiece::npos);
 380   ASSERT_EQ(b.find_last_not_of('c'), 1U);
 381   ASSERT_EQ(h.find_last_not_of('x', 2), 2U);
 382   ASSERT_EQ(h.find_last_not_of('=', 2), StringPiece::npos);
 383   ASSERT_EQ(b.find_last_not_of('b', 1), 0U);
 384   // empty string nonsense
 385   ASSERT_EQ(d.find_last_not_of('x'), StringPiece::npos);
 386   ASSERT_EQ(e.find_last_not_of('x'), StringPiece::npos);
 387   ASSERT_EQ(d.find_last_not_of('\0'), StringPiece::npos);
 388   ASSERT_EQ(e.find_last_not_of('\0'), StringPiece::npos);
 389
 390   ASSERT_EQ(a.substr(0, 3), b);
 391   ASSERT_EQ(a.substr(23), c);
 392   ASSERT_EQ(a.substr(23, 3), c);
 393   ASSERT_EQ(a.substr(23, 99), c);
 394   ASSERT_EQ(a.substr(0), a);
 395   ASSERT_EQ(a.substr(3, 2), "de");
 396   // empty string nonsense
 397   ASSERT_EQ(a.substr(99, 2), e);
 398   ASSERT_EQ(d.substr(99), e);
 399   ASSERT_EQ(d.substr(0, 99), e);
 400   ASSERT_EQ(d.substr(99, 99), e);
 401 }
 402
 403 TEST(StringPieceTest, CheckCustom) {
 404   StringPiece a("foobar");
 405   std::string s1("123");
 406   s1 += '\0';
 407   s1 += "456";
 408   StringPiece b(s1);
 409   StringPiece e;
 410   std::string s2;
 411
 412   // CopyToString
 413   a.CopyToString(&s2);
 414   ASSERT_EQ(s2.size(), 6U);
 415   ASSERT_EQ(s2, "foobar");
 416   b.CopyToString(&s2);
 417   ASSERT_EQ(s2.size(), 7U);
 418   ASSERT_EQ(s1, s2);
 419   e.CopyToString(&s2);
 420   ASSERT_TRUE(s2.empty());
 421
 422   // AppendToString
 423   s2.erase();
 424   a.AppendToString(&s2);
 425   ASSERT_EQ(s2.size(), 6U);
 426   ASSERT_EQ(s2, "foobar");
 427   a.AppendToString(&s2);
 428   ASSERT_EQ(s2.size(), 12U);
 429   ASSERT_EQ(s2, "foobarfoobar");
 430
 431   // starts_with
 432   ASSERT_TRUE(a.starts_with(a));
 433   ASSERT_TRUE(a.starts_with("foo"));
 434   ASSERT_TRUE(a.starts_with(e));
 435   ASSERT_TRUE(b.starts_with(s1));
 436   ASSERT_TRUE(b.starts_with(b));
 437   ASSERT_TRUE(b.starts_with(e));
 438   ASSERT_TRUE(e.starts_with(""));
 439   ASSERT_TRUE(!a.starts_with(b));
 440   ASSERT_TRUE(!b.starts_with(a));
 441   ASSERT_TRUE(!e.starts_with(a));
 442
 443   // ends with
 444   ASSERT_TRUE(a.ends_with(a));
 445   ASSERT_TRUE(a.ends_with("bar"));
 446   ASSERT_TRUE(a.ends_with(e));
 447   ASSERT_TRUE(b.ends_with(s1));
 448   ASSERT_TRUE(b.ends_with(b));
 449   ASSERT_TRUE(b.ends_with(e));
 450   ASSERT_TRUE(e.ends_with(""));
 451   ASSERT_TRUE(!a.ends_with(b));
 452   ASSERT_TRUE(!b.ends_with(a));
 453   ASSERT_TRUE(!e.ends_with(a));
 454
 455   // remove_prefix
 456   StringPiece c(a);
 457   c.remove_prefix(3);
 458   ASSERT_EQ(c, "bar");
 459   c = a;
 460   c.remove_prefix(0);
 461   ASSERT_EQ(c, a);
 462   c.remove_prefix(c.size());
 463   ASSERT_EQ(c, e);
 464
 465   // remove_suffix
 466   c = a;
 467   c.remove_suffix(3);
 468   ASSERT_EQ(c, "foo");
 469   c = a;
 470   c.remove_suffix(0);
 471   ASSERT_EQ(c, a);
 472   c.remove_suffix(c.size());
 473   ASSERT_EQ(c, e);
 474
 475   // set
 476   c.set("foobar", 6);
 477   ASSERT_EQ(c, a);
 478   c.set("foobar", 0);
 479   ASSERT_EQ(c, e);
 480   c.set("foobar", 7);
 481   ASSERT_NE(c, a);
 482
 483   c.set("foobar");
 484   ASSERT_EQ(c, a);
 485
 486   c.set(static_cast<const void*>("foobar"), 6);
 487   ASSERT_EQ(c, a);
 488   c.set(static_cast<const void*>("foobar"), 0);
 489   ASSERT_EQ(c, e);
 490   c.set(static_cast<const void*>("foobar"), 7);
 491   ASSERT_NE(c, a);
 492
 493   // as_string
 494   std::string s3(a.as_string().c_str(), 7);
 495   ASSERT_EQ(c, s3);
 496   std::string s4(e.as_string());
 497   ASSERT_TRUE(s4.empty());
 498 }
 499
 500 TEST(StringPieceTest, CheckNULL) {
 501   // we used to crash here, but now we don't.
 502   StringPiece s(NULL);
 503   ASSERT_EQ(s.data(), (const char*)NULL);
 504   ASSERT_EQ(s.size(), 0U);
 505
 506   s.set(NULL);
 507   ASSERT_EQ(s.data(), (const char*)NULL);
 508   ASSERT_EQ(s.size(), 0U);
 509 }
 510
 511 TEST(StringPieceTest, CheckComparisons2) {
 512   StringPiece abc("abcdefghijklmnopqrstuvwxyz");
 513
 514   // check comparison operations on strings longer than 4 bytes.
 515   ASSERT_TRUE(abc == StringPiece("abcdefghijklmnopqrstuvwxyz"));
 516   ASSERT_TRUE(abc.compare(StringPiece("abcdefghijklmnopqrstuvwxyz")) == 0);
 517
 518   ASSERT_TRUE(abc < StringPiece("abcdefghijklmnopqrstuvwxzz"));
 519   ASSERT_TRUE(abc.compare(StringPiece("abcdefghijklmnopqrstuvwxzz")) < 0);
 520
 521   ASSERT_TRUE(abc > StringPiece("abcdefghijklmnopqrstuvwxyy"));
 522   ASSERT_TRUE(abc.compare(StringPiece("abcdefghijklmnopqrstuvwxyy")) > 0);
 523
 524   // starts_with
 525   ASSERT_TRUE(abc.starts_with(abc));
 526   ASSERT_TRUE(abc.starts_with("abcdefghijklm"));
 527   ASSERT_TRUE(!abc.starts_with("abcdefguvwxyz"));
 528
 529   // ends_with
 530   ASSERT_TRUE(abc.ends_with(abc));
 531   ASSERT_TRUE(!abc.ends_with("abcdefguvwxyz"));
 532   ASSERT_TRUE(abc.ends_with("nopqrstuvwxyz"));
 533 }
 534
 535 TEST(StringPieceTest, StringCompareNotAmbiguous) {
 536   ASSERT_TRUE("hello" == std::string("hello"));
 537   ASSERT_TRUE("hello" < std::string("world"));
 538 }
 539
 540 TEST(StringPieceTest, HeterogenousStringPieceEquals) {
 541   ASSERT_TRUE(StringPiece("hello") == std::string("hello"));
 542   ASSERT_TRUE("hello" == StringPiece("hello"));
 543 }
 544
 545 TEST(StringPiece16Test, CheckComparisonOperators) {
 546   ASSERT_TRUE(StringPiece16(string16()) ==
 547               StringPiece16(string16()));
 548   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) ==
 549               StringPiece16(ASCIIToUTF16("a")));
 550   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("aa")) ==
 551               StringPiece16(ASCIIToUTF16("aa")));
 552   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("a")) ==
 553                StringPiece16(string16()));
 554   ASSERT_FALSE(StringPiece16(string16()) ==
 555                StringPiece16(ASCIIToUTF16("a")));
 556   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("a")) ==
 557                StringPiece16(ASCIIToUTF16("b")));
 558   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("a")) ==
 559                StringPiece16(ASCIIToUTF16("aa")));
 560   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("aa")) ==
 561                StringPiece16(ASCIIToUTF16("a")));
 562
 563   ASSERT_FALSE(StringPiece16(string16()) !=
 564                StringPiece16(string16()));
 565   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("a")) !=
 566                StringPiece16(ASCIIToUTF16("a")));
 567   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("aa")) !=
 568                StringPiece16(ASCIIToUTF16("aa")));
 569   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) !=
 570               StringPiece16(string16()));
 571   ASSERT_TRUE(StringPiece16(string16()) !=
 572               StringPiece16(ASCIIToUTF16("a")));
 573   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) !=
 574               StringPiece16(ASCIIToUTF16("b")));
 575   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) !=
 576               StringPiece16(ASCIIToUTF16("aa")));
 577   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("aa")) !=
 578               StringPiece16(ASCIIToUTF16("a")));
 579
 580   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) <
 581               StringPiece16(ASCIIToUTF16("b")));
 582   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) <
 583               StringPiece16(ASCIIToUTF16("aa")));
 584   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("aa")) <
 585               StringPiece16(ASCIIToUTF16("b")));
 586   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("aa")) <
 587               StringPiece16(ASCIIToUTF16("bb")));
 588   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("a")) <
 589                StringPiece16(ASCIIToUTF16("a")));
 590   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("b")) <
 591                StringPiece16(ASCIIToUTF16("a")));
 592   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("aa")) <
 593                StringPiece16(ASCIIToUTF16("a")));
 594   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("b")) <
 595                StringPiece16(ASCIIToUTF16("aa")));
 596   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("bb")) <
 597                StringPiece16(ASCIIToUTF16("aa")));
 598
 599   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) <=
 600               StringPiece16(ASCIIToUTF16("a")));
 601   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) <=
 602               StringPiece16(ASCIIToUTF16("b")));
 603   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) <=
 604               StringPiece16(ASCIIToUTF16("aa")));
 605   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("aa")) <=
 606               StringPiece16(ASCIIToUTF16("b")));
 607   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("aa")) <=
 608               StringPiece16(ASCIIToUTF16("bb")));
 609   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("b")) <=
 610                StringPiece16(ASCIIToUTF16("a")));
 611   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("aa")) <=
 612                StringPiece16(ASCIIToUTF16("a")));
 613   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("b")) <=
 614                StringPiece16(ASCIIToUTF16("aa")));
 615   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("bb")) <=
 616                StringPiece16(ASCIIToUTF16("aa")));
 617
 618   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) <=
 619               StringPiece16(ASCIIToUTF16("a")));
 620   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) <=
 621               StringPiece16(ASCIIToUTF16("b")));
 622   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) <=
 623               StringPiece16(ASCIIToUTF16("aa")));
 624   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("aa")) <=
 625               StringPiece16(ASCIIToUTF16("b")));
 626   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("aa")) <=
 627               StringPiece16(ASCIIToUTF16("bb")));
 628   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("b")) <=
 629                StringPiece16(ASCIIToUTF16("a")));
 630   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("aa")) <=
 631                StringPiece16(ASCIIToUTF16("a")));
 632   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("b")) <=
 633                StringPiece16(ASCIIToUTF16("aa")));
 634   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("bb")) <=
 635                StringPiece16(ASCIIToUTF16("aa")));
 636
 637   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("a")) >=
 638                StringPiece16(ASCIIToUTF16("b")));
 639   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("a")) >=
 640                StringPiece16(ASCIIToUTF16("aa")));
 641   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("aa")) >=
 642                StringPiece16(ASCIIToUTF16("b")));
 643   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("aa")) >=
 644                StringPiece16(ASCIIToUTF16("bb")));
 645   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("a")) >=
 646               StringPiece16(ASCIIToUTF16("a")));
 647   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("b")) >=
 648               StringPiece16(ASCIIToUTF16("a")));
 649   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("aa")) >=
 650               StringPiece16(ASCIIToUTF16("a")));
 651   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("b")) >=
 652               StringPiece16(ASCIIToUTF16("aa")));
 653   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("bb")) >=
 654               StringPiece16(ASCIIToUTF16("aa")));
 655
 656   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("a")) >
 657                StringPiece16(ASCIIToUTF16("a")));
 658   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("a")) >
 659                StringPiece16(ASCIIToUTF16("b")));
 660   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("a")) >
 661                StringPiece16(ASCIIToUTF16("aa")));
 662   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("aa")) >
 663                StringPiece16(ASCIIToUTF16("b")));
 664   ASSERT_FALSE(StringPiece16(ASCIIToUTF16("aa")) >
 665                StringPiece16(ASCIIToUTF16("bb")));
 666   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("b")) >
 667               StringPiece16(ASCIIToUTF16("a")));
 668   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("aa")) >
 669               StringPiece16(ASCIIToUTF16("a")));
 670   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("b")) >
 671               StringPiece16(ASCIIToUTF16("aa")));
 672   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("bb")) >
 673               StringPiece16(ASCIIToUTF16("aa")));
 674
 675   string16 x;
 676   for (int i = 0; i < 256; i++) {
 677     x += 'a';
 678     string16 y = x;
 679     ASSERT_EQ(StringPiece16(x), StringPiece16(y));
 680     for (int j = 0; j < i; j++) {
 681       string16 z = x;
 682       z[j] = 'b';       // Differs in position 'j'
 683       ASSERT_NE(StringPiece16(x), StringPiece16(z));
 684     }
 685   }
 686 }
 687
 688 TEST(StringPiece16Test, CheckSTL) {
 689   string16 first = ASCIIToUTF16("abcdefghijklmnopqrstuvwxyz");
 690   StringPiece16 a(first);
 691   string16 second = ASCIIToUTF16("abc");
 692   StringPiece16 b(second.c_str());
 693   string16 third = ASCIIToUTF16("xyz");
 694   StringPiece16 c(third.c_str(), third.size());
 695   string16 fourth = ASCIIToUTF16("foobarrandomstuff");
 696   StringPiece16 d(fourth.c_str(), 6);
 697   StringPiece16 e;
 698   // Check some non-ascii characters.
 699   string16 fifth(ASCIIToUTF16("123"));
 700   fifth.push_back(0x0000);
 701   fifth.push_back(0xd8c5);
 702   fifth.push_back(0xdffe);
 703   StringPiece16 f(fifth);
 704
 705   ASSERT_EQ(a[6], 'g');
 706   ASSERT_EQ(b[0], 'a');
 707   ASSERT_EQ(c[2], 'z');
 708   ASSERT_EQ(f[3], '\0');
 709   ASSERT_EQ(f[5], static_cast<char16>(0xdffe));
 710
 711   ASSERT_EQ(*d.data(), 'f');
 712   ASSERT_EQ(d.data()[5], 'r');
 713   ASSERT_TRUE(e.data() == NULL);
 714
 715   ASSERT_EQ(*a.begin(), 'a');
 716   ASSERT_EQ(*(b.begin() + 2), 'c');
 717   ASSERT_EQ(*(c.end() - 1), 'z');
 718
 719   ASSERT_EQ(*a.rbegin(), 'z');
 720   ASSERT_EQ(*(b.rbegin() + 2), 'a');
 721   ASSERT_EQ(*(c.rend() - 1), 'x');
 722   ASSERT_TRUE(a.rbegin() + 26 == a.rend());
 723
 724   ASSERT_EQ(a.size(), 26U);
 725   ASSERT_EQ(b.size(), 3U);
 726   ASSERT_EQ(c.size(), 3U);
 727   ASSERT_EQ(d.size(), 6U);
 728   ASSERT_EQ(e.size(), 0U);
 729   ASSERT_EQ(f.size(), 6U);
 730
 731   ASSERT_TRUE(!d.empty());
 732   ASSERT_TRUE(d.begin() != d.end());
 733   ASSERT_TRUE(d.begin() + 6 == d.end());
 734
 735   ASSERT_TRUE(e.empty());
 736   ASSERT_TRUE(e.begin() == e.end());
 737
 738   d.clear();
 739   ASSERT_EQ(d.size(), 0U);
 740   ASSERT_TRUE(d.empty());
 741   ASSERT_TRUE(d.data() == NULL);
 742   ASSERT_TRUE(d.begin() == d.end());
 743
 744   ASSERT_GE(a.max_size(), a.capacity());
 745   ASSERT_GE(a.capacity(), a.size());
 746 }
 747
 748 TEST(StringPiece16Test, CheckNULL) {
 749   StringPiece16 s(NULL);
 750   ASSERT_EQ(s.data(), (const char16*)NULL);
 751   ASSERT_EQ(s.size(), 0U);
 752
 753   s.set(NULL);
 754   ASSERT_EQ(s.data(), (const char16*)NULL);
 755   ASSERT_EQ(s.size(), 0U);
 756
 757   string16 str = s.as_string16();
 758   ASSERT_EQ(s.data(), (const char16*)NULL);
 759   ASSERT_EQ(s.size(), 0U);
 760 }
 761
 762 TEST(StringPiece16Test, HeterogenousStringPieceEquals) {
 763   ASSERT_TRUE(StringPiece16(ASCIIToUTF16("hello")) == ASCIIToUTF16("hello"));
 764 }
 765
 766 TEST(StringPiece16Test, CheckConversion) {
 767   // Make sure that we can convert from UTF8 to UTF16 and back. We use a two
 768   // byte character (G clef) to test this.
 769   ASSERT_EQ(
 770       UTF16ToUTF8(
 771           StringPiece16(UTF8ToUTF16("\xf0\x9d\x84\x9e")).as_string16()),
 772       "\xf0\x9d\x84\x9e");
 773 }
 774
 775 }  // namespace base