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#!/usr/bin/env python
#
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"""Tests Google Test's throw-on-failure mode with exceptions disabled.
 
This script invokes gtest_throw_on_failure_test_ (a program written with
Google Test) with different environments and command line flags.
"""
 
__author__ = 'wan@google.com (Zhanyong Wan)'
 
import os
import gtest_test_utils
 
 
# Constants.
 
# The command line flag for enabling/disabling the throw-on-failure mode.
THROW_ON_FAILURE = 'gtest_throw_on_failure'
 
# Path to the gtest_throw_on_failure_test_ program, compiled with
# exceptions disabled.
EXE_PATH = gtest_test_utils.GetTestExecutablePath(
    'gtest_throw_on_failure_test_')
 
 
# Utilities.
 
 
def SetEnvVar(env_var, value):
  """Sets an environment variable to a given value; unsets it when the
  given value is None.
  """
 
  env_var = env_var.upper()
  if value is not None:
    os.environ[env_var] = value
  elif env_var in os.environ:
    del os.environ[env_var]
 
 
def Run(command):
  """Runs a command; returns True/False if its exit code is/isn't 0."""
 
  print('Running "%s". . .' % ' '.join(command))
  p = gtest_test_utils.Subprocess(command)
  return p.exited and p.exit_code == 0
 
 
# The tests.  TODO(wan@google.com): refactor the class to share common
# logic with code in gtest_break_on_failure_unittest.py.
class ThrowOnFailureTest(gtest_test_utils.TestCase):
  """Tests the throw-on-failure mode."""
 
  def RunAndVerify(self, env_var_value, flag_value, should_fail):
    """Runs gtest_throw_on_failure_test_ and verifies that it does
    (or does not) exit with a non-zero code.
 
    Args:
      env_var_value:    value of the GTEST_BREAK_ON_FAILURE environment
                        variable; None if the variable should be unset.
      flag_value:       value of the --gtest_break_on_failure flag;
                        None if the flag should not be present.
      should_fail:      True iff the program is expected to fail.
    """
 
    SetEnvVar(THROW_ON_FAILURE, env_var_value)
 
    if env_var_value is None:
      env_var_value_msg = ' is not set'
    else:
      env_var_value_msg = '=' + env_var_value
 
    if flag_value is None:
      flag = ''
    elif flag_value == '0':
      flag = '--%s=0' % THROW_ON_FAILURE
    else:
      flag = '--%s' % THROW_ON_FAILURE
 
    command = [EXE_PATH]
    if flag:
      command.append(flag)
 
    if should_fail:
      should_or_not = 'should'
    else:
      should_or_not = 'should not'
 
    failed = not Run(command)
 
    SetEnvVar(THROW_ON_FAILURE, None)
 
    msg = ('when %s%s, an assertion failure in "%s" %s cause a non-zero '
           'exit code.' %
           (THROW_ON_FAILURE, env_var_value_msg, ' '.join(command),
            should_or_not))
    self.assert_(failed == should_fail, msg)
 
  def testDefaultBehavior(self):
    """Tests the behavior of the default mode."""
 
    self.RunAndVerify(env_var_value=None, flag_value=None, should_fail=False)
 
  def testThrowOnFailureEnvVar(self):
    """Tests using the GTEST_THROW_ON_FAILURE environment variable."""
 
    self.RunAndVerify(env_var_value='0',
                      flag_value=None,
                      should_fail=False)
    self.RunAndVerify(env_var_value='1',
                      flag_value=None,
                      should_fail=True)
 
  def testThrowOnFailureFlag(self):
    """Tests using the --gtest_throw_on_failure flag."""
 
    self.RunAndVerify(env_var_value=None,
                      flag_value='0',
                      should_fail=False)
    self.RunAndVerify(env_var_value=None,
                      flag_value='1',
                      should_fail=True)
 
  def testThrowOnFailureFlagOverridesEnvVar(self):
    """Tests that --gtest_throw_on_failure overrides GTEST_THROW_ON_FAILURE."""
 
    self.RunAndVerify(env_var_value='0',
                      flag_value='0',
                      should_fail=False)
    self.RunAndVerify(env_var_value='0',
                      flag_value='1',
                      should_fail=True)
    self.RunAndVerify(env_var_value='1',
                      flag_value='0',
                      should_fail=False)
    self.RunAndVerify(env_var_value='1',
                      flag_value='1',
                      should_fail=True)
 
 
if __name__ == '__main__':
  gtest_test_utils.Main()