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#!/usr/bin/python
"""
Copyright 2014 Google Inc.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
A wrapper around the standard Python unittest library, adding features we need
for various unittests within this directory.
"""
import filecmp
import os
import shutil
import tempfile
import unittest
PARENT_DIR = os.path.dirname(os.path.realpath(__file__))
TESTDATA_DIR = os.path.join(PARENT_DIR, 'testdata')
OUTPUT_DIR_ACTUAL = os.path.join(TESTDATA_DIR, 'outputs', 'actual')
OUTPUT_DIR_EXPECTED = os.path.join(TESTDATA_DIR, 'outputs', 'expected')
class TestCase(unittest.TestCase):
def setUp(self):
self._input_dir = os.path.join(TESTDATA_DIR, 'inputs')
self._output_dir_actual = os.path.join(OUTPUT_DIR_ACTUAL, self.id())
self._output_dir_expected = os.path.join(OUTPUT_DIR_EXPECTED, self.id())
create_empty_dir(self._output_dir_actual)
self._temp_dir = tempfile.mkdtemp()
def tearDown(self):
shutil.rmtree(self._temp_dir)
if os.path.exists(self._output_dir_expected):
different_files = find_different_files(self._output_dir_actual,
self._output_dir_expected)
# Maybe we should move this assert elsewhere? It's unusual to see an
# assert within tearDown(), but my thinking was:
# 1. Every test case will have some collection of output files that need
# to be validated.
# 2. So put that validation within tearDown(), which will be called after
# every test case!
#
# I have confirmed that the test really does fail if this assert is
# triggered.
#
# Ravi notes: if somebody later comes along and adds cleanup code below
# this assert, then if tests fail, the artifacts will not be cleaned up.
assert (not different_files), \
('found differing files:\n' +
'\n'.join(['tkdiff %s %s &' % (
os.path.join(self._output_dir_actual, basename),
os.path.join(self._output_dir_expected, basename))
for basename in different_files]))
def shortDescription(self):
"""Tell unittest framework to not print docstrings for test cases."""
return None
def create_empty_dir(path):
"""Create an empty directory at the given path."""
if os.path.isdir(path):
shutil.rmtree(path)
elif os.path.lexists(path):
os.remove(path)
os.makedirs(path)
def find_different_files(dir1, dir2, ignore_subtree_names=None):
"""Returns a list of any files that differ between the directory trees rooted
at dir1 and dir2.
Args:
dir1: root of a directory tree; if nonexistent, will raise OSError
dir2: root of another directory tree; if nonexistent, will raise OSError
ignore_subtree_names: list of subtree directory names to ignore;
defaults to ['.svn'], so all SVN files are ignores
TODO(epoger): include the dirname within each filename (not just the
basename), to make it easier to locate any differences
"""
differing_files = []
if ignore_subtree_names is None:
ignore_subtree_names = ['.svn']
dircmp = filecmp.dircmp(dir1, dir2, ignore=ignore_subtree_names)
differing_files.extend(dircmp.left_only)
differing_files.extend(dircmp.right_only)
differing_files.extend(dircmp.common_funny)
differing_files.extend(dircmp.diff_files)
differing_files.extend(dircmp.funny_files)
for common_dir in dircmp.common_dirs:
differing_files.extend(find_different_files(
os.path.join(dir1, common_dir), os.path.join(dir2, common_dir)))
return differing_files
def main(test_case_class):
"""Run the unit tests within the given class."""
suite = unittest.TestLoader().loadTestsFromTestCase(test_case_class)
results = unittest.TextTestRunner(verbosity=2).run(suite)
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