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#!/usr/bin/env python
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"""Verifies that Google Test correctly parses environment variables."""
 
__author__ = 'wan@google.com (Zhanyong Wan)'
 
import os
import gtest_test_utils
 
 
IS_WINDOWS = os.name == 'nt'
IS_LINUX = os.name == 'posix' and os.uname()[0] == 'Linux'
 
COMMAND = gtest_test_utils.GetTestExecutablePath('gtest_env_var_test_')
 
environ = os.environ.copy()
 
 
def AssertEq(expected, actual):
  if expected != actual:
    print('Expected: %s' % (expected,))
    print('  Actual: %s' % (actual,))
    raise AssertionError
 
 
def SetEnvVar(env_var, value):
  """Sets the env variable to 'value'; unsets it when 'value' is None."""
 
  if value is not None:
    environ[env_var] = value
  elif env_var in environ:
    del environ[env_var]
 
 
def GetFlag(flag):
  """Runs gtest_env_var_test_ and returns its output."""
 
  args = [COMMAND]
  if flag is not None:
    args += [flag]
  return gtest_test_utils.Subprocess(args, env=environ).output
 
 
def TestFlag(flag, test_val, default_val):
  """Verifies that the given flag is affected by the corresponding env var."""
 
  env_var = 'GTEST_' + flag.upper()
  SetEnvVar(env_var, test_val)
  AssertEq(test_val, GetFlag(flag))
  SetEnvVar(env_var, None)
  AssertEq(default_val, GetFlag(flag))
 
 
class GTestEnvVarTest(gtest_test_utils.TestCase):
  def testEnvVarAffectsFlag(self):
    """Tests that environment variable should affect the corresponding flag."""
 
    TestFlag('break_on_failure', '1', '0')
    TestFlag('color', 'yes', 'auto')
    TestFlag('filter', 'FooTest.Bar', '*')
    SetEnvVar('XML_OUTPUT_FILE', None) # For 'output' test
    TestFlag('output', 'xml:tmp/foo.xml', '')
    TestFlag('print_time', '0', '1')
    TestFlag('repeat', '999', '1')
    TestFlag('throw_on_failure', '1', '0')
    TestFlag('death_test_style', 'threadsafe', 'fast')
    TestFlag('catch_exceptions', '0', '1')
 
    if IS_LINUX:
      TestFlag('death_test_use_fork', '1', '0')
      TestFlag('stack_trace_depth', '0', '100')
 
  def testXmlOutputFile(self):
    """Tests that $XML_OUTPUT_FILE affects the output flag."""
 
    SetEnvVar('GTEST_OUTPUT', None)
    SetEnvVar('XML_OUTPUT_FILE', 'tmp/bar.xml')
    AssertEq('xml:tmp/bar.xml', GetFlag('output'))
 
  def testXmlOutputFileOverride(self):
    """Tests that $XML_OUTPUT_FILE is overridden by $GTEST_OUTPUT"""
 
    SetEnvVar('GTEST_OUTPUT', 'xml:tmp/foo.xml')
    SetEnvVar('XML_OUTPUT_FILE', 'tmp/bar.xml')
    AssertEq('xml:tmp/foo.xml', GetFlag('output'))
 
if __name__ == '__main__':
  gtest_test_utils.Main()