Add scripts to list or trace all test cases in a gtest executable.

tools/isolate/list_test_cases.py

Index: tools/isolate/list_test_cases.py
diff --git a/tools/isolate/list_test_cases.py b/tools/isolate/list_test_cases.py
new file mode 100755
index 0000000000000000000000000000000000000000..6c1cf491bd016ab2c1a71905d8719d2668f96a2e
--- /dev/null
+++ b/tools/isolate/list_test_cases.py
@@ -0,0 +1,102 @@
+#!/usr/bin/env python
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""List all the test cases for a google test.
+
+See more info at http://code.google.com/p/googletest/.
+"""
+
+import optparse
+import subprocess
+import sys
+
+
+class Failure(Exception):
+  pass
+
+
+def gtest_list_tests(executable):
+  cmd = [executable, '--gtest_list_tests']
+  p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  out, err = p.communicate()
+  if p.returncode:
+    raise Failure('Failed to run %s\n%s' % (executable, err), p.returncode)
+  # pylint: disable=E1103
+  if err and not err.startswith('Xlib:  extension "RANDR" missing on display '):
+    raise Failure('Unexpected spew:\n%s' % err, 1)
+  return out
+
+
+def _starts_with(a, b, prefix):
+  return a.startswith(prefix) or b.startswith(prefix)
+
+
+def parse_gtest_cases(out, disabled=False, fails=False, flaky=False):
+  """Expected format is a concatenation of this:
+  TestFixture1
+     TestCase1
+     TestCase2
+  """
+  tests = []
+  fixture = None
+  lines = out.splitlines()
+  while lines:
+    line = lines.pop(0)
+    if not line:
+      break
+    if not line.startswith('  '):
+      fixture = line
+    else:
+      case = line[2:]
+      if case.startswith('YOU HAVE'):
+        # It's a 'YOU HAVE foo bar' line. We're done.
+        break
+      assert ' ' not in case
+
+      if not disabled and _starts_with(fixture, case, 'DISABLED_'):
+        continue
+      if not fails and _starts_with(fixture, case, 'FAILS_'):
+        continue
+      if not flaky and _starts_with(fixture, case, 'FLAKY_'):
+        continue
+
+      tests.append(fixture + case)
+  return tests
+
+
+def main():
+  """CLI frontend to validate arguments."""
+  parser = optparse.OptionParser(
+      usage='%prog <options> [gtest]')
+  parser.add_option(
+      '-d', '--disabled',
+      action='store_true',
+      help='Include DISABLED_ tests')
+  parser.add_option(
+      '-f', '--fails',
+      action='store_true',
+      help='Include FAILS_ tests')
+  parser.add_option(
+      '-F', '--flaky',
+      action='store_true',
+      help='Include FLAKY_ tests')
+  options, args = parser.parse_args()
+  if len(args) != 1:
+    parser.error('Please provide the executable to run')
+
+  try:
+    out = gtest_list_tests(args[0])
+    tests = parse_gtest_cases(
+        out, options.disabled, options.fails, options.flaky)
+    for test in tests:
+      print test
+  except Failure, e:
+    print e.args[0]
+    return e.args[1]
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())