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#!/usr/bin/env python

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"""Tests the text output of Google C++ Testing Framework.

SYNOPSIS

       gtest_output_test.py --build_dir=BUILD/DIR --gengolden

         # where BUILD/DIR contains the built gtest_output_test_ file.

       gtest_output_test.py --gengolden

       gtest_output_test.py

"""

__author__ = 'wan@google.com (Zhanyong Wan)'

import difflib

import os

import re

import sys

import gtest_test_utils

# The flag for generating the golden file

GENGOLDEN_FLAG = '--gengolden'

CATCH_EXCEPTIONS_ENV_VAR_NAME = 'GTEST_CATCH_EXCEPTIONS'

IS_WINDOWS = os.name == 'nt'

# TODO(vladl@google.com): remove the _lin suffix.

GOLDEN_NAME = 'gtest_output_test_golden_lin.txt'

PROGRAM_PATH = gtest_test_utils.GetTestExecutablePath('gtest_output_test_')

# At least one command we exercise must not have the

# 'internal_skip_environment_and_ad_hoc_tests' argument.

COMMAND_LIST_TESTS = ({}, [PROGRAM_PATH, '--gtest_list_tests'])

COMMAND_WITH_COLOR = ({}, [PROGRAM_PATH, '--gtest_color=yes'])

COMMAND_WITH_TIME = ({}, [PROGRAM_PATH,

                          '--gtest_print_time',

                          'internal_skip_environment_and_ad_hoc_tests',

                          '--gtest_filter=FatalFailureTest.*:LoggingTest.*'])

COMMAND_WITH_DISABLED = (

    {}, [PROGRAM_PATH,

         '--gtest_also_run_disabled_tests',

         'internal_skip_environment_and_ad_hoc_tests',

         '--gtest_filter=*DISABLED_*'])

COMMAND_WITH_SHARDING = (

    {'GTEST_SHARD_INDEX': '1', 'GTEST_TOTAL_SHARDS': '2'},

    [PROGRAM_PATH,

     'internal_skip_environment_and_ad_hoc_tests',

     '--gtest_filter=PassingTest.*'])

GOLDEN_PATH = os.path.join(gtest_test_utils.GetSourceDir(), GOLDEN_NAME)

def ToUnixLineEnding(s):

  """Changes all Windows/Mac line endings in s to UNIX line endings."""

  return s.replace('\r\n', '\n').replace('\r', '\n')

def RemoveLocations(test_output):

  """Removes all file location info from a Google Test program's output.

  Args:

       test_output:  the output of a Google Test program.

  Returns:

       output with all file location info (in the form of

       'DIRECTORY/FILE_NAME:LINE_NUMBER: 'or

       'DIRECTORY\\FILE_NAME(LINE_NUMBER): ') replaced by

       'FILE_NAME:#: '.

  """

  return re.sub(r'.*[/\\](.+)(\:\d+|\(\d+\))\: ', r'\1:#: ', test_output)

def RemoveStackTraceDetails(output):

  """Removes all stack traces from a Google Test program's output."""

  # *? means "find the shortest string that matches".

  return re.sub(r'Stack trace:(.|\n)*?\n\n',

                'Stack trace: (omitted)\n\n', output)

def RemoveStackTraces(output):

  """Removes all traces of stack traces from a Google Test program's output."""

  # *? means "find the shortest string that matches".

  return re.sub(r'Stack trace:(.|\n)*?\n\n', '', output)

def RemoveTime(output):

  """Removes all time information from a Google Test program's output."""

  return re.sub(r'\(\d+ ms', '(? ms', output)

def RemoveTypeInfoDetails(test_output):

  """Removes compiler-specific type info from Google Test program's output.

  Args:

       test_output:  the output of a Google Test program.

  Returns:

       output with type information normalized to canonical form.

  """

  # some compilers output the name of type 'unsigned int' as 'unsigned'

  return re.sub(r'unsigned int', 'unsigned', test_output)

def NormalizeToCurrentPlatform(test_output):

  """Normalizes platform specific output details for easier comparison."""

  if IS_WINDOWS:

    # Removes the color information that is not present on Windows.

    test_output = re.sub('\x1b\\[(0;3\d)?m', '', test_output)

    # Changes failure message headers into the Windows format.

    test_output = re.sub(r': Failure\n', r': error: ', test_output)

    # Changes file(line_number) to file:line_number.

    test_output = re.sub(r'((\w|\.)+)\((\d+)\):', r'\1:\3:', test_output)

  return test_output

def RemoveTestCounts(output):

  """Removes test counts from a Google Test program's output."""

  output = re.sub(r'\d+ tests?, listed below',

                  '? tests, listed below', output)

  output = re.sub(r'\d+ FAILED TESTS',

                  '? FAILED TESTS', output)

  output = re.sub(r'\d+ tests? from \d+ test cases?',

                  '? tests from ? test cases', output)

  output = re.sub(r'\d+ tests? from ([a-zA-Z_])',

                  r'? tests from \1', output)

  return re.sub(r'\d+ tests?\.', '? tests.', output)

def RemoveMatchingTests(test_output, pattern):

  """Removes output of specified tests from a Google Test program's output.

  This function strips not only the beginning and the end of a test but also

  all output in between.

  Args:

    test_output:       A string containing the test output.

    pattern:           A regex string that matches names of test cases or

                       tests to remove.

  Returns:

    Contents of test_output with tests whose names match pattern removed.

  """

  test_output = re.sub(

      r'.*\[ RUN      \] .*%s(.|\n)*?\[(  FAILED  |       OK )\] .*%s.*\n' % (

          pattern, pattern),

      '',

      test_output)

  return re.sub(r'.*%s.*\n' % pattern, '', test_output)

def NormalizeOutput(output):

  """Normalizes output (the output of gtest_output_test_.exe)."""

  output = ToUnixLineEnding(output)

  output = RemoveLocations(output)

  output = RemoveStackTraceDetails(output)

  output = RemoveTime(output)

  return output

def GetShellCommandOutput(env_cmd):

  """Runs a command in a sub-process, and returns its output in a string.

  Args:

    env_cmd: The shell command. A 2-tuple where element 0 is a dict of extra

             environment variables to set, and element 1 is a string with

             the command and any flags.

  Returns:

    A string with the command's combined standard and diagnostic output.

  """

  # Spawns cmd in a sub-process, and gets its standard I/O file objects.

  # Set and save the environment properly.

  environ = os.environ.copy()

  environ.update(env_cmd[0])

  p = gtest_test_utils.Subprocess(env_cmd[1], env=environ)

  return p.output

def GetCommandOutput(env_cmd):

  """Runs a command and returns its output with all file location

  info stripped off.

  Args:

    env_cmd:  The shell command. A 2-tuple where element 0 is a dict of extra

              environment variables to set, and element 1 is a string with

              the command and any flags.

  """

  # Disables exception pop-ups on Windows.

  environ, cmdline = env_cmd

  environ = dict(environ)  # Ensures we are modifying a copy.

  environ[CATCH_EXCEPTIONS_ENV_VAR_NAME] = '1'

  return NormalizeOutput(GetShellCommandOutput((environ, cmdline)))

def GetOutputOfAllCommands():

  """Returns concatenated output from several representative commands."""

  return (GetCommandOutput(COMMAND_WITH_COLOR) +

          GetCommandOutput(COMMAND_WITH_TIME) +

          GetCommandOutput(COMMAND_WITH_DISABLED) +

          GetCommandOutput(COMMAND_WITH_SHARDING))

test_list = GetShellCommandOutput(COMMAND_LIST_TESTS)

SUPPORTS_DEATH_TESTS = 'DeathTest' in test_list

SUPPORTS_TYPED_TESTS = 'TypedTest' in test_list

SUPPORTS_THREADS = 'ExpectFailureWithThreadsTest' in test_list

SUPPORTS_STACK_TRACES = False

CAN_GENERATE_GOLDEN_FILE = (SUPPORTS_DEATH_TESTS and

                            SUPPORTS_TYPED_TESTS and

                            SUPPORTS_THREADS and

                            not IS_WINDOWS)

class GTestOutputTest(gtest_test_utils.TestCase):

  def RemoveUnsupportedTests(self, test_output):

    if not SUPPORTS_DEATH_TESTS:

      test_output = RemoveMatchingTests(test_output, 'DeathTest')

    if not SUPPORTS_TYPED_TESTS:

      test_output = RemoveMatchingTests(test_output, 'TypedTest')

      test_output = RemoveMatchingTests(test_output, 'TypedDeathTest')

      test_output = RemoveMatchingTests(test_output, 'TypeParamDeathTest')

    if not SUPPORTS_THREADS:

      test_output = RemoveMatchingTests(test_output,

                                        'ExpectFailureWithThreadsTest')

      test_output = RemoveMatchingTests(test_output,

                                        'ScopedFakeTestPartResultReporterTest')

      test_output = RemoveMatchingTests(test_output,

                                        'WorksConcurrently')

    if not SUPPORTS_STACK_TRACES:

      test_output = RemoveStackTraces(test_output)

    return test_output

  def testOutput(self):

    output = GetOutputOfAllCommands()

    golden_file = open(GOLDEN_PATH, 'r')

    # A mis-configured source control system can cause \r appear in EOL

    # sequences when we read the golden file irrespective of an operating

    # system used. Therefore, we need to strip those \r's from newlines

    # unconditionally.

    golden = ToUnixLineEnding(golden_file.read())

    golden_file.close()

    # We want the test to pass regardless of certain features being

    # supported or not.

    # We still have to remove type name specifics in all cases.

    normalized_actual = RemoveTypeInfoDetails(output)

    normalized_golden = RemoveTypeInfoDetails(golden)

    if CAN_GENERATE_GOLDEN_FILE:

      self.assertEqual(normalized_golden, normalized_actual,

                       '\n'.join(difflib.unified_diff(

                           normalized_golden.split('\n'),

                           normalized_actual.split('\n'),

                           'golden', 'actual')))

    else:

      normalized_actual = NormalizeToCurrentPlatform(

          RemoveTestCounts(normalized_actual))

      normalized_golden = NormalizeToCurrentPlatform(

          RemoveTestCounts(self.RemoveUnsupportedTests(normalized_golden)))

      # This code is very handy when debugging golden file differences:

      if os.getenv('DEBUG_GTEST_OUTPUT_TEST'):

        open(os.path.join(

            gtest_test_utils.GetSourceDir(),

            '_gtest_output_test_normalized_actual.txt'), 'wb').write(

                normalized_actual)

        open(os.path.join(

            gtest_test_utils.GetSourceDir(),

            '_gtest_output_test_normalized_golden.txt'), 'wb').write(

                normalized_golden)

      self.assertEqual(normalized_golden, normalized_actual)

if __name__ == '__main__':

  if sys.argv[1:] == [GENGOLDEN_FLAG]:

    if CAN_GENERATE_GOLDEN_FILE:

      output = GetOutputOfAllCommands()

      golden_file = open(GOLDEN_PATH, 'wb')

      golden_file.write(output)

      golden_file.close()

    else:

      message = (

          """Unable to write a golden file when compiled in an environment

that does not support all the required features (death tests, typed tests,

and multiple threads).  Please generate the golden file using a binary built

with those features enabled.""")

      sys.stderr.write(message)

      sys.exit(1)

  else:

    gtest_test_utils.Main()