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#!/usr/bin/env python

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"""Verifies that Google Test correctly determines whether to use colors."""

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

import os

import gtest_test_utils

IS_WINDOWS = os.name = 'nt'

COLOR_ENV_VAR = 'GTEST_COLOR'

COLOR_FLAG = 'gtest_color'

COMMAND = gtest_test_utils.GetTestExecutablePath('gtest_color_test_')

def SetEnvVar(env_var, value):

  """Sets the env variable to 'value'; unsets it when 'value' is None."""

  if value is not None:

    os.environ[env_var] = value

  elif env_var in os.environ:

    del os.environ[env_var]

def UsesColor(term, color_env_var, color_flag):

  """Runs gtest_color_test_ and returns its exit code."""

  SetEnvVar('TERM', term)

  SetEnvVar(COLOR_ENV_VAR, color_env_var)

  if color_flag is None:

    args = []

  else:

    args = ['--%s=%s' % (COLOR_FLAG, color_flag)]

  p = gtest_test_utils.Subprocess([COMMAND] + args)

  return not p.exited or p.exit_code

class GTestColorTest(gtest_test_utils.TestCase):

  def testNoEnvVarNoFlag(self):

    """Tests the case when there's neither GTEST_COLOR nor --gtest_color."""

    if not IS_WINDOWS:

      self.assert_(not UsesColor('dumb', None, None))

      self.assert_(not UsesColor('emacs', None, None))

      self.assert_(not UsesColor('xterm-mono', None, None))

      self.assert_(not UsesColor('unknown', None, None))

      self.assert_(not UsesColor(None, None, None))

    self.assert_(UsesColor('linux', None, None))

    self.assert_(UsesColor('cygwin', None, None))

    self.assert_(UsesColor('xterm', None, None))

    self.assert_(UsesColor('xterm-color', None, None))

    self.assert_(UsesColor('xterm-256color', None, None))

  def testFlagOnly(self):

    """Tests the case when there's --gtest_color but not GTEST_COLOR."""

    self.assert_(not UsesColor('dumb', None, 'no'))

    self.assert_(not UsesColor('xterm-color', None, 'no'))

    if not IS_WINDOWS:

      self.assert_(not UsesColor('emacs', None, 'auto'))

    self.assert_(UsesColor('xterm', None, 'auto'))

    self.assert_(UsesColor('dumb', None, 'yes'))

    self.assert_(UsesColor('xterm', None, 'yes'))

  def testEnvVarOnly(self):

    """Tests the case when there's GTEST_COLOR but not --gtest_color."""

    self.assert_(not UsesColor('dumb', 'no', None))

    self.assert_(not UsesColor('xterm-color', 'no', None))

    if not IS_WINDOWS:

      self.assert_(not UsesColor('dumb', 'auto', None))

    self.assert_(UsesColor('xterm-color', 'auto', None))

    self.assert_(UsesColor('dumb', 'yes', None))

    self.assert_(UsesColor('xterm-color', 'yes', None))

  def testEnvVarAndFlag(self):

    """Tests the case when there are both GTEST_COLOR and --gtest_color."""

    self.assert_(not UsesColor('xterm-color', 'no', 'no'))

    self.assert_(UsesColor('dumb', 'no', 'yes'))

    self.assert_(UsesColor('xterm-color', 'no', 'auto'))

  def testAliasesOfYesAndNo(self):

    """Tests using aliases in specifying --gtest_color."""

    self.assert_(UsesColor('dumb', None, 'true'))

    self.assert_(UsesColor('dumb', None, 'YES'))

    self.assert_(UsesColor('dumb', None, 'T'))

    self.assert_(UsesColor('dumb', None, '1'))

    self.assert_(not UsesColor('xterm', None, 'f'))

    self.assert_(not UsesColor('xterm', None, 'false'))

    self.assert_(not UsesColor('xterm', None, '0'))

    self.assert_(not UsesColor('xterm', None, 'unknown'))

if __name__ == '__main__':

  gtest_test_utils.Main()