Viewing file:  test_script_helper.py (5.78 KB) -rw-r--r--
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"""Unittests for test.support.script_helper. Who tests the test helper?"""
import subprocess
import sys
import os
from test.support import script_helper
import unittest
from unittest import mock
class TestScriptHelper(unittest.TestCase):
def test_assert_python_ok(self):
t = script_helper.assert_python_ok('-c', 'import sys; sys.exit(0)')
self.assertEqual(0, t[0], 'return code was not 0')
def test_assert_python_failure(self):
# I didn't import the sys module so this child will fail.
rc, out, err = script_helper.assert_python_failure('-c', 'sys.exit(0)')
self.assertNotEqual(0, rc, 'return code should not be 0')
def test_assert_python_ok_raises(self):
# I didn't import the sys module so this child will fail.
with self.assertRaises(AssertionError) as error_context:
script_helper.assert_python_ok('-c', 'sys.exit(0)')
error_msg = str(error_context.exception)
self.assertIn('command line:', error_msg)
self.assertIn('sys.exit(0)', error_msg, msg='unexpected command line')
def test_assert_python_failure_raises(self):
with self.assertRaises(AssertionError) as error_context:
script_helper.assert_python_failure('-c', 'import sys; sys.exit(0)')
error_msg = str(error_context.exception)
self.assertIn('Process return code is 0\n', error_msg)
self.assertIn('import sys; sys.exit(0)', error_msg,
msg='unexpected command line.')
@mock.patch('subprocess.Popen')
def test_assert_python_isolated_when_env_not_required(self, mock_popen):
with mock.patch.object(script_helper,
'interpreter_requires_environment',
return_value=False) as mock_ire_func:
mock_popen.side_effect = RuntimeError('bail out of unittest')
try:
script_helper._assert_python(True, '-c', 'None')
except RuntimeError as err:
self.assertEqual('bail out of unittest', err.args[0])
self.assertEqual(1, mock_popen.call_count)
self.assertEqual(1, mock_ire_func.call_count)
popen_command = mock_popen.call_args[0][0]
self.assertEqual(sys.executable, popen_command[0])
self.assertIn('None', popen_command)
self.assertIn('-I', popen_command)
self.assertNotIn('-E', popen_command) # -I overrides this
@mock.patch('subprocess.Popen')
def test_assert_python_not_isolated_when_env_is_required(self, mock_popen):
"""Ensure that -I is not passed when the environment is required."""
with mock.patch.object(script_helper,
'interpreter_requires_environment',
return_value=True) as mock_ire_func:
mock_popen.side_effect = RuntimeError('bail out of unittest')
try:
script_helper._assert_python(True, '-c', 'None')
except RuntimeError as err:
self.assertEqual('bail out of unittest', err.args[0])
popen_command = mock_popen.call_args[0][0]
self.assertNotIn('-I', popen_command)
self.assertNotIn('-E', popen_command)
class TestScriptHelperEnvironment(unittest.TestCase):
"""Code coverage for interpreter_requires_environment()."""
def setUp(self):
self.assertTrue(
hasattr(script_helper, '__cached_interp_requires_environment'))
# Reset the private cached state.
script_helper.__dict__['__cached_interp_requires_environment'] = None
def tearDown(self):
# Reset the private cached state.
script_helper.__dict__['__cached_interp_requires_environment'] = None
@mock.patch('subprocess.check_call')
def test_interpreter_requires_environment_true(self, mock_check_call):
with mock.patch.dict(os.environ):
os.environ.pop('PYTHONHOME', None)
mock_check_call.side_effect = subprocess.CalledProcessError('', '')
self.assertTrue(script_helper.interpreter_requires_environment())
self.assertTrue(script_helper.interpreter_requires_environment())
self.assertEqual(1, mock_check_call.call_count)
@mock.patch('subprocess.check_call')
def test_interpreter_requires_environment_false(self, mock_check_call):
with mock.patch.dict(os.environ):
os.environ.pop('PYTHONHOME', None)
# The mocked subprocess.check_call fakes a no-error process.
script_helper.interpreter_requires_environment()
self.assertFalse(script_helper.interpreter_requires_environment())
self.assertEqual(1, mock_check_call.call_count)
@mock.patch('subprocess.check_call')
def test_interpreter_requires_environment_details(self, mock_check_call):
with mock.patch.dict(os.environ):
os.environ.pop('PYTHONHOME', None)
script_helper.interpreter_requires_environment()
self.assertFalse(script_helper.interpreter_requires_environment())
self.assertFalse(script_helper.interpreter_requires_environment())
self.assertEqual(1, mock_check_call.call_count)
check_call_command = mock_check_call.call_args[0][0]
self.assertEqual(sys.executable, check_call_command[0])
self.assertIn('-E', check_call_command)
@mock.patch('subprocess.check_call')
def test_interpreter_requires_environment_with_pythonhome(self, mock_check_call):
with mock.patch.dict(os.environ):
os.environ['PYTHONHOME'] = 'MockedHome'
self.assertTrue(script_helper.interpreter_requires_environment())
self.assertTrue(script_helper.interpreter_requires_environment())
self.assertEqual(0, mock_check_call.call_count)
if __name__ == '__main__':
unittest.main()
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