lldb/test/API/commands/expression/multiline-navigation/TestMultilineNavigation.py

   1 """
   2 Tests navigating in the multiline expression editor.
   3 """
   4
   5 import lldb
   6 from lldbsuite.test.decorators import *
   7 from lldbsuite.test.lldbtest import *
   8 from lldbsuite.test.lldbpexpect import PExpectTest
   9
  10
  11 class TestCase(PExpectTest):
  12     arrow_up = "\033[A"
  13     arrow_down = "\033[B"
  14
  15     # PExpect uses many timeouts internally and doesn't play well
  16     # under ASAN on a loaded machine..
  17     @skipIfAsan
  18     @skipIfEditlineSupportMissing
  19     @expectedFailureAll(oslist=["freebsd"], bugnumber="llvm.org/pr48316")
  20     @skipIf(oslist=["linux"], archs=["arm", "aarch64"])  # Randomly fails on buildbot
  21     def test_nav_arrow_up(self):
  22         """Tests that we can navigate back to the previous line with the up arrow"""
  23         self.launch()
  24
  25         # Start multiline expression mode by just running 'expr'
  26         self.child.sendline("expr")
  27         self.child.expect_exact("terminate with an empty line to evaluate")
  28         # Create a simple integer expression '123' and press enter.
  29         self.child.send("123\n")
  30         # We should see the prompt for the second line of our expression.
  31         self.child.expect_exact("2: ")
  32         # Go back to the first line and change 123 to 124.
  33         # Then press enter twice to evaluate our expression.
  34         self.child.send(self.arrow_up + "\b4\n\n")
  35         # The result of our expression should be 124 (our edited expression)
  36         # and not 123 (the one we initially typed).
  37         self.child.expect_exact("(int) $0 = 124")
  38
  39         self.quit()
  40
  41     @skipIfAsan
  42     @skipIfEditlineSupportMissing
  43     @expectedFailureAll(oslist=["freebsd"], bugnumber="llvm.org/pr48316")
  44     @skipIf(oslist=["linux"], archs=["arm", "aarch64"])  # Randomly fails on buildbot
  45     def test_nav_arrow_down(self):
  46         """Tests that we can navigate to the next line with the down arrow"""
  47         self.launch()
  48
  49         # Start multiline expression mode by just running 'expr'
  50         self.child.sendline("expr")
  51         self.child.expect_exact("terminate with an empty line to evaluate")
  52         # Create a simple integer expression '111' and press enter.
  53         self.child.send("111\n")
  54         # We should see the prompt for the second line of our expression.
  55         self.child.expect_exact("2: ")
  56         # Create another simple integer expression '222'.
  57         self.child.send("222")
  58         # Go back to the first line and change '111' to '111+' to make
  59         # an addition operation that spans two lines. We need to go up to
  60         # test that we can go back down again.
  61         self.child.send(self.arrow_up + "+")
  62         # Go back down to our second line and change '222' to '223'
  63         # so that the full expression is now '111+\n223'.
  64         # Then press enter twice to evaluate the expression.
  65         self.child.send(self.arrow_down + "\b3\n\n")
  66         # The result of our expression '111 + 223' should be '334'.
  67         # If the expression is '333' then arrow down failed to get
  68         # us back to the second line.
  69         self.child.expect_exact("(int) $0 = 334")
  70
  71         self.quit()
  72
  73     @skipIfAsan
  74     @skipIfEditlineSupportMissing
  75     @skipIf(oslist=["linux"], archs=["arm", "aarch64"])  # Randomly fails on buildbot
  76     def test_nav_arrow_up_empty(self):
  77         """
  78         Tests that navigating with the up arrow doesn't crash and skips
  79         empty history entries.
  80         """
  81         self.launch()
  82
  83         # Create a real history entry '456' and then follow up with an
  84         # empty entry (that shouldn't be saved).
  85         self.child.sendline("expr")
  86         self.child.expect_exact("terminate with an empty line to evaluate")
  87         self.child.send("456\n\n")
  88         self.expect_prompt()
  89
  90         self.child.sendline("expr")
  91         self.child.expect_exact("terminate with an empty line to evaluate")
  92         self.child.send("\n")
  93         self.expect_prompt()
  94
  95         # The up arrow should recall the actual history entry and not the
  96         # the empty entry (as that one shouldn't have been saved).
  97         self.child.sendline("expr")
  98         self.child.expect_exact("terminate with an empty line to evaluate")
  99         self.child.send(self.arrow_up)
 100         self.child.expect_exact("456")
 101         self.child.send("\n\n")
 102         self.expect_prompt()
 103
 104         self.quit()