message: Remove sleep() synchronisation from teststcase and
  make the executable name more unique.
  This test is failing sporadically on some bots. By removing the sleep
  synchronisation, I'm hoping to get it to fail more reproducibly so I
  can investigate what is going on.
diff: @@ -35,7 +35,7 @@ class HelloWorldTestCase(TestBase):
  def test_with_process_launch_api(self):
  """Create target, breakpoint, launch a process, and then kill it."""
  # Get the full path to our executable to be attached/debugged.
  - exe = self.getBuildArtifact(self.testMethodName)
  + exe = '%s_%d'%(self.getBuildArtifact(self.testMethodName), os.getpid())
  d = {'EXE': exe}
  self.build(dictionary=d)
  self.setTearDownCleanup(dictionary=d)
  @@ -82,7 +82,7 @@ class HelloWorldTestCase(TestBase):
  @expectedFailureAll(oslist=['ios', 'watchos', 'tvos', 'bridgeos'], bugnumber="<rdar://problem/34538611>") # old lldb-server has race condition, launching an inferior and then launching debugserver in quick succession sometimes fails
  def test_with_attach_to_process_with_id_api(self):
  """Create target, spawn a process, and attach to it with process id."""
  - exe = self.getBuildArtifact(self.testMethodName)
  + exe = '%s_%d'%(self.getBuildArtifact(self.testMethodName), os.getpid())
  d = {'EXE': exe}
  self.build(dictionary=d)
  self.setTearDownCleanup(dictionary=d)
  @@ -92,9 +92,6 @@ class HelloWorldTestCase(TestBase):
  popen = self.spawnSubprocess(exe, ["abc", "xyz"])
  self.addTearDownHook(self.cleanupSubprocesses)
  - # Give the subprocess time to start and wait for user input
  - time.sleep(0.25)
  -
  listener = lldb.SBListener("my.attach.listener")
  error = lldb.SBError()
  process = target.AttachToProcessWithID(listener, popen.pid, error)
  @@ -114,7 +111,7 @@ class HelloWorldTestCase(TestBase):
  @expectedFailureAll(oslist=['ios', 'watchos', 'tvos', 'bridgeos'], bugnumber="<rdar://problem/34538611>") # old lldb-server has race condition, launching an inferior and then launching debugserver in quick succession sometimes fails
  def test_with_attach_to_process_with_name_api(self):
  """Create target, spawn a process, and attach to it with process name."""
  - exe = self.getBuildArtifact(self.testMethodName)
  + exe = '%s_%d'%(self.getBuildArtifact(self.testMethodName), os.getpid())
  d = {'EXE': exe}
  self.build(dictionary=d)
  self.setTearDownCleanup(dictionary=d)
  @@ -124,9 +121,6 @@ class HelloWorldTestCase(TestBase):
  popen = self.spawnSubprocess(exe, ["abc", "xyz"])
  self.addTearDownHook(self.cleanupSubprocesses)
  - # Give the subprocess time to start and wait for user input
  - time.sleep(0.25)
  -
  listener = lldb.SBListener("my.attach.listener")
  error = lldb.SBError()
  # Pass 'False' since we don't want to wait for new instance of
  