third_party/googletest/test/googletest-global-environment-unittest.py

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"""Unit test for Google Test's global test environment behavior.

A user can specify a global test environment via
testing::AddGlobalTestEnvironment. Failures in the global environment should
result in all unit tests being skipped.

This script tests such functionality by invoking
googletest-global-environment-unittest_ (a program written with Google Test).
"""

import re
from googletest.test import gtest_test_utils


def RunAndReturnOutput(args=None):
  """Runs the test program and returns its output."""

  return gtest_test_utils.Subprocess(
      [
          gtest_test_utils.GetTestExecutablePath(
              'googletest-global-environment-unittest_'
          )
      ]
      + (args or [])
  ).output


class GTestGlobalEnvironmentUnitTest(gtest_test_utils.TestCase):
  """Tests global test environment failures."""

  def testEnvironmentSetUpFails(self):
    """Tests the behavior of not specifying the fail_fast."""

    # Run the test.
    txt = RunAndReturnOutput()

    # We should see the text of the global environment setup error.
    self.assertIn('Canned environment setup error', txt)

    # Our test should have been skipped due to the error, and not treated as a
    # pass.
    self.assertIn('[  SKIPPED ] 1 test', txt)
    self.assertIn('[  PASSED  ] 0 tests', txt)

    # The test case shouldn't have been run.
    self.assertNotIn('Unexpected call', txt)

  def testEnvironmentSetUpAndTornDownForEachRepeat(self):
    """Tests the behavior of test environments and gtest_repeat."""

    # When --gtest_recreate_environments_when_repeating is true, the global test
    # environment should be set up and torn down for each iteration.
    txt = RunAndReturnOutput([
        '--gtest_repeat=2',
        '--gtest_recreate_environments_when_repeating=true',
    ])

    expected_pattern = (
        '(.|\n)*'
        r'Repeating all tests \(iteration 1\)'
        '(.|\n)*'
        'Global test environment set-up.'
        '(.|\n)*'
        'SomeTest.DoesFoo'
        '(.|\n)*'
        'Global test environment tear-down'
        '(.|\n)*'
        r'Repeating all tests \(iteration 2\)'
        '(.|\n)*'
        'Global test environment set-up.'
        '(.|\n)*'
        'SomeTest.DoesFoo'
        '(.|\n)*'
        'Global test environment tear-down'
        '(.|\n)*'
    )
    self.assertRegex(txt, expected_pattern)

  def testEnvironmentSetUpAndTornDownOnce(self):
    """Tests environment and --gtest_recreate_environments_when_repeating."""

    # By default the environment should only be set up and torn down once, at
    # the start and end of the test respectively.
    txt = RunAndReturnOutput(
        [
            '--gtest_repeat=2',
        ]
    )

    expected_pattern = (
        '(.|\n)*'
        r'Repeating all tests \(iteration 1\)'
        '(.|\n)*'
        'Global test environment set-up.'
        '(.|\n)*'
        'SomeTest.DoesFoo'
        '(.|\n)*'
        r'Repeating all tests \(iteration 2\)'
        '(.|\n)*'
        'SomeTest.DoesFoo'
        '(.|\n)*'
        'Global test environment tear-down'
        '(.|\n)*'
    )
    self.assertRegex(txt, expected_pattern)

    self.assertEqual(len(re.findall('Global test environment set-up', txt)), 1)
    self.assertEqual(
        len(re.findall('Global test environment tear-down', txt)), 1
    )


if __name__ == '__main__':
  gtest_test_utils.Main()