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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 errno
import os
import shutil
import sys
import unittest
# Set the PYTHONPATH to include the tools directory.
sys.path.append(
os.path.join(os.path.dirname(os.path.realpath(__file__)), os.pardir))
import find_run_binary
class TestCase(unittest.TestCase):
def shortDescription(self):
"""Tell unittest framework to not print docstrings for test cases."""
return None
def create_empty_dir(self, path):
"""Creates an empty directory at path and returns path.
Args:
path: path on local disk
"""
shutil.rmtree(path=path, ignore_errors=True)
try:
os.makedirs(path)
except OSError as exc:
if exc.errno != errno.EEXIST:
raise
return path
def run_command(self, args):
"""Runs a program from the command line and returns stdout.
Args:
args: Command line to run, as a list of string parameters. args[0] is the
binary to run.
Returns:
stdout from the program, as a single string.
Raises:
Exception: the program exited with a nonzero return code.
"""
return find_run_binary.run_command(args)
def find_path_to_program(self, program):
"""Returns path to an existing program binary.
Args:
program: Basename of the program to find (e.g., 'render_pictures').
Returns:
Absolute path to the program binary, as a string.
Raises:
Exception: unable to find the program binary.
"""
return find_run_binary.find_path_to_program(program)
def main(test_case_class):
"""Run the unit tests within the given class.
Raises an Exception if any of those tests fail (in case we are running in the
context of run_all.py, which depends on that Exception to signal failures).
TODO(epoger): Make all of our unit tests use the Python unittest framework,
so we can leverage its ability to run *all* the tests and report failures at
the end.
"""
suite = unittest.TestLoader().loadTestsFromTestCase(test_case_class)
results = unittest.TextTestRunner(verbosity=2).run(suite)
if not results.wasSuccessful():
raise Exception('failed unittest %s' % test_case_class)
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