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1#!/usr/bin/env python
2#
3# Copyright 2009, Google Inc.
4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions are
8# met:
9#
10#     * Redistributions of source code must retain the above copyright
11# notice, this list of conditions and the following disclaimer.
12#     * Redistributions in binary form must reproduce the above
13# copyright notice, this list of conditions and the following disclaimer
14# in the documentation and/or other materials provided with the
15# distribution.
16#     * Neither the name of Google Inc. nor the names of its
17# contributors may be used to endorse or promote products derived from
18# this software without specific prior written permission.
19#
20# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31
32"""Tests Google Test's throw-on-failure mode with exceptions disabled.
33
34This script invokes gtest_throw_on_failure_test_ (a program written with
35Google Test) with different environments and command line flags.
36"""
37
38__author__ = 'wan@google.com (Zhanyong Wan)'
39
40import gtest_test_utils
41import os
42import unittest
43
44
45# Constants.
46
47# The command line flag for enabling/disabling the throw-on-failure mode.
48THROW_ON_FAILURE = 'gtest_throw_on_failure'
49
50# Path to the gtest_throw_on_failure_test_ program, compiled with
51# exceptions disabled.
52EXE_PATH = os.path.join(gtest_test_utils.GetBuildDir(),
53                        'gtest_throw_on_failure_test_')
54
55
56# Utilities.
57
58
59def SetEnvVar(env_var, value):
60  """Sets an environment variable to a given value; unsets it when the
61  given value is None.
62  """
63
64  env_var = env_var.upper()
65  if value is not None:
66    os.environ[env_var] = value
67  elif env_var in os.environ:
68    del os.environ[env_var]
69
70
71def Run(command):
72  """Runs a command; returns True/False if its exit code is/isn't 0."""
73
74  print 'Running "%s". . .' % ' '.join(command)
75  return gtest_test_utils.Subprocess(command).exit_code == 0
76
77
78# The tests.  TODO(wan@google.com): refactor the class to share common
79# logic with code in gtest_break_on_failure_unittest.py.
80class ThrowOnFailureTest(unittest.TestCase):
81  """Tests the throw-on-failure mode."""
82
83  def RunAndVerify(self, env_var_value, flag_value, should_fail):
84    """Runs gtest_throw_on_failure_test_ and verifies that it does
85    (or does not) exit with a non-zero code.
86
87    Args:
88      env_var_value:    value of the GTEST_BREAK_ON_FAILURE environment
89                        variable; None if the variable should be unset.
90      flag_value:       value of the --gtest_break_on_failure flag;
91                        None if the flag should not be present.
92      should_fail:      True iff the program is expected to fail.
93    """
94
95    SetEnvVar(THROW_ON_FAILURE, env_var_value)
96
97    if env_var_value is None:
98      env_var_value_msg = ' is not set'
99    else:
100      env_var_value_msg = '=' + env_var_value
101
102    if flag_value is None:
103      flag = ''
104    elif flag_value == '0':
105      flag = '--%s=0' % THROW_ON_FAILURE
106    else:
107      flag = '--%s' % THROW_ON_FAILURE
108
109    command = [EXE_PATH]
110    if flag:
111      command.append(flag)
112
113    if should_fail:
114      should_or_not = 'should'
115    else:
116      should_or_not = 'should not'
117
118    failed = not Run(command)
119
120    SetEnvVar(THROW_ON_FAILURE, None)
121
122    msg = ('when %s%s, an assertion failure in "%s" %s cause a non-zero '
123           'exit code.' %
124           (THROW_ON_FAILURE, env_var_value_msg, ' '.join(command),
125            should_or_not))
126    self.assert_(failed == should_fail, msg)
127
128  def testDefaultBehavior(self):
129    """Tests the behavior of the default mode."""
130
131    self.RunAndVerify(env_var_value=None, flag_value=None, should_fail=False)
132
133  def testThrowOnFailureEnvVar(self):
134    """Tests using the GTEST_THROW_ON_FAILURE environment variable."""
135
136    self.RunAndVerify(env_var_value='0',
137                      flag_value=None,
138                      should_fail=False)
139    self.RunAndVerify(env_var_value='1',
140                      flag_value=None,
141                      should_fail=True)
142
143  def testThrowOnFailureFlag(self):
144    """Tests using the --gtest_throw_on_failure flag."""
145
146    self.RunAndVerify(env_var_value=None,
147                      flag_value='0',
148                      should_fail=False)
149    self.RunAndVerify(env_var_value=None,
150                      flag_value='1',
151                      should_fail=True)
152
153  def testThrowOnFailureFlagOverridesEnvVar(self):
154    """Tests that --gtest_throw_on_failure overrides GTEST_THROW_ON_FAILURE."""
155
156    self.RunAndVerify(env_var_value='0',
157                      flag_value='0',
158                      should_fail=False)
159    self.RunAndVerify(env_var_value='0',
160                      flag_value='1',
161                      should_fail=True)
162    self.RunAndVerify(env_var_value='1',
163                      flag_value='0',
164                      should_fail=False)
165    self.RunAndVerify(env_var_value='1',
166                      flag_value='1',
167                      should_fail=True)
168
169
170if __name__ == '__main__':
171  gtest_test_utils.Main()
172