1#!/usr/bin/env python
2#
3# Copyright 2008, Google Inc.
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31
32"""Tests the text output of Google C++ Testing Framework.
33
34SYNOPSIS
35       gtest_output_test.py --build_dir=BUILD/DIR --gengolden
36         # where BUILD/DIR contains the built gtest_output_test_ file.
37       gtest_output_test.py --gengolden
38       gtest_output_test.py
39"""
40
41__author__ = 'wan@google.com (Zhanyong Wan)'
42
43import os
44import re
45import sys
46import gtest_test_utils
47
48
49# The flag for generating the golden file
50GENGOLDEN_FLAG = '--gengolden'
51CATCH_EXCEPTIONS_ENV_VAR_NAME = 'GTEST_CATCH_EXCEPTIONS'
52
53IS_WINDOWS = os.name == 'nt'
54
55# TODO(vladl@google.com): remove the _lin suffix.
56GOLDEN_NAME = 'gtest_output_test_golden_lin.txt'
57
58PROGRAM_PATH = gtest_test_utils.GetTestExecutablePath('gtest_output_test_')
59
60# At least one command we exercise must not have the
61# --gtest_internal_skip_environment_and_ad_hoc_tests flag.
62COMMAND_LIST_TESTS = ({}, [PROGRAM_PATH, '--gtest_list_tests'])
63COMMAND_WITH_COLOR = ({}, [PROGRAM_PATH, '--gtest_color=yes'])
64COMMAND_WITH_TIME = ({}, [PROGRAM_PATH,
65                          '--gtest_print_time',
66                          '--gtest_internal_skip_environment_and_ad_hoc_tests',
67                          '--gtest_filter=FatalFailureTest.*:LoggingTest.*'])
68COMMAND_WITH_DISABLED = (
69    {}, [PROGRAM_PATH,
70         '--gtest_also_run_disabled_tests',
71         '--gtest_internal_skip_environment_and_ad_hoc_tests',
72         '--gtest_filter=*DISABLED_*'])
73COMMAND_WITH_SHARDING = (
74    {'GTEST_SHARD_INDEX': '1', 'GTEST_TOTAL_SHARDS': '2'},
75    [PROGRAM_PATH,
76     '--gtest_internal_skip_environment_and_ad_hoc_tests',
77     '--gtest_filter=PassingTest.*'])
78
79GOLDEN_PATH = os.path.join(gtest_test_utils.GetSourceDir(), GOLDEN_NAME)
80
81
82def ToUnixLineEnding(s):
83  """Changes all Windows/Mac line endings in s to UNIX line endings."""
84
85  return s.replace('\r\n', '\n').replace('\r', '\n')
86
87
88def RemoveLocations(test_output):
89  """Removes all file location info from a Google Test program's output.
90
91  Args:
92       test_output:  the output of a Google Test program.
93
94  Returns:
95       output with all file location info (in the form of
96       'DIRECTORY/FILE_NAME:LINE_NUMBER: 'or
97       'DIRECTORY\\FILE_NAME(LINE_NUMBER): ') replaced by
98       'FILE_NAME:#: '.
99  """
100
101  return re.sub(r'.*[/\\](.+)(\:\d+|\(\d+\))\: ', r'\1:#: ', test_output)
102
103
104def RemoveStackTraceDetails(output):
105  """Removes all stack traces from a Google Test program's output."""
106
107  # *? means "find the shortest string that matches".
108  return re.sub(r'Stack trace:(.|\n)*?\n\n',
109                'Stack trace: (omitted)\n\n', output)
110
111
112def RemoveStackTraces(output):
113  """Removes all traces of stack traces from a Google Test program's output."""
114
115  # *? means "find the shortest string that matches".
116  return re.sub(r'Stack trace:(.|\n)*?\n\n', '', output)
117
118
119def RemoveTime(output):
120  """Removes all time information from a Google Test program's output."""
121
122  return re.sub(r'\(\d+ ms', '(? ms', output)
123
124
125def RemoveTypeInfoDetails(test_output):
126  """Removes compiler-specific type info from Google Test program's output.
127
128  Args:
129       test_output:  the output of a Google Test program.
130
131  Returns:
132       output with type information normalized to canonical form.
133  """
134
135  # some compilers output the name of type 'unsigned int' as 'unsigned'
136  return re.sub(r'unsigned int', 'unsigned', test_output)
137
138
139def NormalizeToCurrentPlatform(test_output):
140  """Normalizes platform specific output details for easier comparison."""
141
142  if IS_WINDOWS:
143    # Removes the color information that is not present on Windows.
144    test_output = re.sub('\x1b\\[(0;3\d)?m', '', test_output)
145    # Changes failure message headers into the Windows format.
146    test_output = re.sub(r': Failure\n', r': error: ', test_output)
147    # Changes file(line_number) to file:line_number.
148    test_output = re.sub(r'((\w|\.)+)\((\d+)\):', r'\1:\3:', test_output)
149
150  return test_output
151
152
153def RemoveTestCounts(output):
154  """Removes test counts from a Google Test program's output."""
155
156  output = re.sub(r'\d+ tests?, listed below',
157                  '? tests, listed below', output)
158  output = re.sub(r'\d+ FAILED TESTS',
159                  '? FAILED TESTS', output)
160  output = re.sub(r'\d+ tests? from \d+ test cases?',
161                  '? tests from ? test cases', output)
162  output = re.sub(r'\d+ tests? from ([a-zA-Z_])',
163                  r'? tests from \1', output)
164  return re.sub(r'\d+ tests?\.', '? tests.', output)
165
166
167def RemoveMatchingTests(test_output, pattern):
168  """Removes output of specified tests from a Google Test program's output.
169
170  This function strips not only the beginning and the end of a test but also
171  all output in between.
172
173  Args:
174    test_output:       A string containing the test output.
175    pattern:           A regex string that matches names of test cases or
176                       tests to remove.
177
178  Returns:
179    Contents of test_output with tests whose names match pattern removed.
180  """
181
182  test_output = re.sub(
183      r'.*\[ RUN      \] .*%s(.|\n)*?\[(  FAILED  |       OK )\] .*%s.*\n' % (
184          pattern, pattern),
185      '',
186      test_output)
187  return re.sub(r'.*%s.*\n' % pattern, '', test_output)
188
189
190def NormalizeOutput(output):
191  """Normalizes output (the output of gtest_output_test_.exe)."""
192
193  output = ToUnixLineEnding(output)
194  output = RemoveLocations(output)
195  output = RemoveStackTraceDetails(output)
196  output = RemoveTime(output)
197  return output
198
199
200def GetShellCommandOutput(env_cmd):
201  """Runs a command in a sub-process, and returns its output in a string.
202
203  Args:
204    env_cmd: The shell command. A 2-tuple where element 0 is a dict of extra
205             environment variables to set, and element 1 is a string with
206             the command and any flags.
207
208  Returns:
209    A string with the command's combined standard and diagnostic output.
210  """
211
212  # Spawns cmd in a sub-process, and gets its standard I/O file objects.
213  # Set and save the environment properly.
214  environ = os.environ.copy()
215  environ.update(env_cmd[0])
216  p = gtest_test_utils.Subprocess(env_cmd[1], env=environ)
217
218  return p.output
219
220
221def GetCommandOutput(env_cmd):
222  """Runs a command and returns its output with all file location
223  info stripped off.
224
225  Args:
226    env_cmd:  The shell command. A 2-tuple where element 0 is a dict of extra
227              environment variables to set, and element 1 is a string with
228              the command and any flags.
229  """
230
231  # Disables exception pop-ups on Windows.
232  environ, cmdline = env_cmd
233  environ = dict(environ)  # Ensures we are modifying a copy.
234  environ[CATCH_EXCEPTIONS_ENV_VAR_NAME] = '1'
235  return NormalizeOutput(GetShellCommandOutput((environ, cmdline)))
236
237
238def GetOutputOfAllCommands():
239  """Returns concatenated output from several representative commands."""
240
241  return (GetCommandOutput(COMMAND_WITH_COLOR) +
242          GetCommandOutput(COMMAND_WITH_TIME) +
243          GetCommandOutput(COMMAND_WITH_DISABLED) +
244          GetCommandOutput(COMMAND_WITH_SHARDING))
245
246
247test_list = GetShellCommandOutput(COMMAND_LIST_TESTS)
248SUPPORTS_DEATH_TESTS = 'DeathTest' in test_list
249SUPPORTS_TYPED_TESTS = 'TypedTest' in test_list
250SUPPORTS_THREADS = 'ExpectFailureWithThreadsTest' in test_list
251SUPPORTS_STACK_TRACES = False
252
253CAN_GENERATE_GOLDEN_FILE = (SUPPORTS_DEATH_TESTS and
254                            SUPPORTS_TYPED_TESTS and
255                            SUPPORTS_THREADS and
256                            not IS_WINDOWS)
257
258class GTestOutputTest(gtest_test_utils.TestCase):
259  def RemoveUnsupportedTests(self, test_output):
260    if not SUPPORTS_DEATH_TESTS:
261      test_output = RemoveMatchingTests(test_output, 'DeathTest')
262    if not SUPPORTS_TYPED_TESTS:
263      test_output = RemoveMatchingTests(test_output, 'TypedTest')
264      test_output = RemoveMatchingTests(test_output, 'TypedDeathTest')
265      test_output = RemoveMatchingTests(test_output, 'TypeParamDeathTest')
266    if not SUPPORTS_THREADS:
267      test_output = RemoveMatchingTests(test_output,
268                                        'ExpectFailureWithThreadsTest')
269      test_output = RemoveMatchingTests(test_output,
270                                        'ScopedFakeTestPartResultReporterTest')
271      test_output = RemoveMatchingTests(test_output,
272                                        'WorksConcurrently')
273    if not SUPPORTS_STACK_TRACES:
274      test_output = RemoveStackTraces(test_output)
275
276    return test_output
277
278  def testOutput(self):
279    output = GetOutputOfAllCommands()
280
281    golden_file = open(GOLDEN_PATH, 'rb')
282    # A mis-configured source control system can cause \r appear in EOL
283    # sequences when we read the golden file irrespective of an operating
284    # system used. Therefore, we need to strip those \r's from newlines
285    # unconditionally.
286    golden = ToUnixLineEnding(golden_file.read())
287    golden_file.close()
288
289    # We want the test to pass regardless of certain features being
290    # supported or not.
291
292    # We still have to remove type name specifics in all cases.
293    normalized_actual = RemoveTypeInfoDetails(output)
294    normalized_golden = RemoveTypeInfoDetails(golden)
295
296    if CAN_GENERATE_GOLDEN_FILE:
297      self.assertEqual(normalized_golden, normalized_actual)
298    else:
299      normalized_actual = NormalizeToCurrentPlatform(
300          RemoveTestCounts(normalized_actual))
301      normalized_golden = NormalizeToCurrentPlatform(
302          RemoveTestCounts(self.RemoveUnsupportedTests(normalized_golden)))
303
304      # This code is very handy when debugging golden file differences:
305      if os.getenv('DEBUG_GTEST_OUTPUT_TEST'):
306        open(os.path.join(
307            gtest_test_utils.GetSourceDir(),
308            '_gtest_output_test_normalized_actual.txt'), 'wb').write(
309                normalized_actual)
310        open(os.path.join(
311            gtest_test_utils.GetSourceDir(),
312            '_gtest_output_test_normalized_golden.txt'), 'wb').write(
313                normalized_golden)
314
315      self.assertEqual(normalized_golden, normalized_actual)
316
317
318if __name__ == '__main__':
319  if sys.argv[1:] == [GENGOLDEN_FLAG]:
320    if CAN_GENERATE_GOLDEN_FILE:
321      output = GetOutputOfAllCommands()
322      golden_file = open(GOLDEN_PATH, 'wb')
323      golden_file.write(output)
324      golden_file.close()
325    else:
326      message = (
327          """Unable to write a golden file when compiled in an environment
328that does not support all the required features (death tests, typed tests,
329and multiple threads).  Please generate the golden file using a binary built
330with those features enabled.""")
331
332      sys.stderr.write(message)
333      sys.exit(1)
334  else:
335    gtest_test_utils.Main()
336