infra/base-images/base-builder/bisect_clang_test.py - platform/external/oss-fuzz - Git at Google

 # Copyright 2019 Google Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
 ################################################################################
 """Tests for bisect_clang.py"""
 import os
 from unittest import mock
 import unittest

 import bisect_clang

 FILE_DIRECTORY = os.path.dirname(__file__)
 LLVM_REPO_PATH = '/llvm-project'


 def get_git_command(*args):
   """Returns a git command for the LLVM repo with |args| as arguments."""
   return ['git', '-C', LLVM_REPO_PATH] + list(args)


 def patch_environ(testcase_obj):
   """Patch environment."""
   env = {}
   patcher = mock.patch.dict(os.environ, env)
   testcase_obj.addCleanup(patcher.stop)
   patcher.start()


 class BisectClangTestMixin:  # pylint: disable=too-few-public-methods
   """Useful mixin for bisect_clang unittests."""

   def setUp(self):  # pylint: disable=invalid-name
     """Initialization method for unittests."""
     patch_environ(self)
     os.environ['SRC'] = '/src'
     os.environ['WORK'] = '/work'


 class GetClangBuildEnvTest(BisectClangTestMixin, unittest.TestCase):
   """Tests for get_clang_build_env."""

   def test_cflags(self):
     """Test that CFLAGS are not used compiling clang."""
     os.environ['CFLAGS'] = 'blah'
     self.assertNotIn('CFLAGS', bisect_clang.get_clang_build_env())

   def test_cxxflags(self):
     """Test that CXXFLAGS are not used compiling clang."""
     os.environ['CXXFLAGS'] = 'blah'
     self.assertNotIn('CXXFLAGS', bisect_clang.get_clang_build_env())

   def test_other_variables(self):
     """Test that other env vars are used when compiling clang."""
     key = 'other'
     value = 'blah'
     os.environ[key] = value
     self.assertEqual(value, bisect_clang.get_clang_build_env()[key])


 def read_test_data(filename):
   """Returns data from |filename| in the test_data directory."""
   with open(os.path.join(FILE_DIRECTORY, 'test_data', filename)) as file_handle:
     return file_handle.read()


 class SearchBisectOutputTest(BisectClangTestMixin, unittest.TestCase):
   """Tests for search_bisect_output."""

   def test_search_bisect_output(self):
     """Test that search_bisect_output finds the responsible commit when one
     exists."""
     test_data = read_test_data('culprit-commit.txt')
     self.assertEqual('ac9ee01fcbfac745aaedca0393a8e1c8a33acd8d',
                      bisect_clang.search_bisect_output(test_data))

   def test_search_bisect_output_none(self):
     """Test that search_bisect_output doesnt find a non-existent culprit
     commit."""
     self.assertIsNone(bisect_clang.search_bisect_output('hello'))


 def create_mock_popen(
     output=bytes('', 'utf-8'), err=bytes('', 'utf-8'), returncode=0):
   """Creates a mock subprocess.Popen."""

   class MockPopen:
     """Mock subprocess.Popen."""
     commands = []
     testcases_written = []

     def __init__(self, command, *args, **kwargs):  # pylint: disable=unused-argument
       """Inits the MockPopen."""
       stdout = kwargs.pop('stdout', None)
       self.command = command
       self.commands.append(command)
       self.stdout = None
       self.stderr = None
       self.returncode = returncode
       if hasattr(stdout, 'write'):
         self.stdout = stdout

     def communicate(self, input_data=None):  # pylint: disable=unused-argument
       """Mock subprocess.Popen.communicate."""
       if self.stdout:
         self.stdout.write(output)

       if self.stderr:
         self.stderr.write(err)

       return output, err

     def poll(self, input_data=None):  # pylint: disable=unused-argument
       """Mock subprocess.Popen.poll."""
       return self.returncode

   return MockPopen


 def mock_prepare_build_impl(llvm_project_path):  # pylint: disable=unused-argument
   """Mocked prepare_build function."""
   return '/work/llvm-build'


 class BuildClangTest(BisectClangTestMixin, unittest.TestCase):
   """Tests for build_clang."""

   def test_build_clang_test(self):
     """Tests that build_clang works as intended."""
     with mock.patch('subprocess.Popen', create_mock_popen()) as mock_popen:
       with mock.patch('bisect_clang.prepare_build', mock_prepare_build_impl):
         llvm_src_dir = '/src/llvm-project'
         bisect_clang.build_clang(llvm_src_dir)
         self.assertEqual([['ninja', '-C', '/work/llvm-build', 'install']],
                          mock_popen.commands)


 class GitRepoTest(BisectClangTestMixin, unittest.TestCase):
   """Tests for GitRepo."""

   # TODO(metzman): Mock filesystem. Until then, use a real directory.

   def setUp(self):
     super().setUp()
     self.git = bisect_clang.GitRepo(LLVM_REPO_PATH)
     self.good_commit = 'good_commit'
     self.bad_commit = 'bad_commit'
     self.test_command = 'testcommand'

   def test_do_command(self):
     """Test do_command creates a new process as intended."""
     # TODO(metzman): Test directory changing behavior.
     command = ['subcommand', '--option']
     with mock.patch('subprocess.Popen', create_mock_popen()) as mock_popen:
       self.git.do_command(command)
       self.assertEqual([get_git_command('subcommand', '--option')],
                        mock_popen.commands)

   def _test_test_start_commit_unexpected(self, label, commit, returncode):
     """Tests test_start_commit works as intended when the test returns an
     unexpected value."""

     def mock_execute_impl(command, *args, **kwargs):  # pylint: disable=unused-argument
       if command == self.test_command:
         return returncode, '', ''
       return 0, '', ''

     with mock.patch('bisect_clang.execute', mock_execute_impl):
       with mock.patch('bisect_clang.prepare_build', mock_prepare_build_impl):
         with self.assertRaises(bisect_clang.BisectError):
           self.git.test_start_commit(commit, label, self.test_command)

   def test_test_start_commit_bad_zero(self):
     """Tests test_start_commit works as intended when the test on the first bad
     commit returns 0."""
     self._test_test_start_commit_unexpected('bad', self.bad_commit, 0)

   def test_test_start_commit_good_nonzero(self):
     """Tests test_start_commit works as intended when the test on the first good
     commit returns nonzero."""
     self._test_test_start_commit_unexpected('good', self.good_commit, 1)

   def test_test_start_commit_good_zero(self):
     """Tests test_start_commit works as intended when the test on the first good
     commit returns 0."""
     self._test_test_start_commit_expected('good', self.good_commit, 0)  # pylint: disable=no-value-for-parameter

   @mock.patch('bisect_clang.build_clang')
   def _test_test_start_commit_expected(self, label, commit, returncode,
                                        mock_build_clang):
     """Tests test_start_commit works as intended when the test returns an
     expected value."""
     command_args = []

     def mock_execute_impl(command, *args, **kwargs):  # pylint: disable=unused-argument
       command_args.append(command)
       if command == self.test_command:
         return returncode, '', ''
       return 0, '', ''

     with mock.patch('bisect_clang.execute', mock_execute_impl):
       self.git.test_start_commit(commit, label, self.test_command)
       self.assertEqual([
           get_git_command('checkout', commit), self.test_command,
           get_git_command('bisect', label)
       ], command_args)
       mock_build_clang.assert_called_once_with(LLVM_REPO_PATH)

   def test_test_start_commit_bad_nonzero(self):
     """Tests test_start_commit works as intended when the test on the first bad
     commit returns nonzero."""
     self._test_test_start_commit_expected('bad', self.bad_commit, 1)  # pylint: disable=no-value-for-parameter

   @mock.patch('bisect_clang.GitRepo.test_start_commit')
   def test_bisect_start(self, mock_test_start_commit):
     """Tests bisect_start works as intended."""
     with mock.patch('subprocess.Popen', create_mock_popen()) as mock_popen:
       self.git.bisect_start(self.good_commit, self.bad_commit,
                             self.test_command)
       self.assertEqual(get_git_command('bisect', 'start'),
                        mock_popen.commands[0])
       mock_test_start_commit.assert_has_calls([
           mock.call('bad_commit', 'bad', 'testcommand'),
           mock.call('good_commit', 'good', 'testcommand')
       ])

   def test_do_bisect_command(self):
     """Test do_bisect_command executes a git bisect subcommand as intended."""
     subcommand = 'subcommand'
     with mock.patch('subprocess.Popen', create_mock_popen()) as mock_popen:
       self.git.do_bisect_command(subcommand)
       self.assertEqual([get_git_command('bisect', subcommand)],
                        mock_popen.commands)

   @mock.patch('bisect_clang.build_clang')
   def _test_test_commit(self, label, output, returncode, mock_build_clang):
     """Test test_commit works as intended."""
     command_args = []

     def mock_execute_impl(command, *args, **kwargs):  # pylint: disable=unused-argument
       command_args.append(command)
       if command == self.test_command:
         return returncode, output, ''
       return 0, output, ''

     with mock.patch('bisect_clang.execute', mock_execute_impl):
       result = self.git.test_commit(self.test_command)
       self.assertEqual([self.test_command,
                         get_git_command('bisect', label)], command_args)
     mock_build_clang.assert_called_once_with(LLVM_REPO_PATH)
     return result

   def test_test_commit_good(self):
     """Test test_commit labels a good commit as good."""
     self.assertIsNone(self._test_test_commit('good', '', 0))  # pylint: disable=no-value-for-parameter

   def test_test_commit_bad(self):
     """Test test_commit labels a bad commit as bad."""
     self.assertIsNone(self._test_test_commit('bad', '', 1))  # pylint: disable=no-value-for-parameter

   def test_test_commit_culprit(self):
     """Test test_commit returns the culprit"""
     test_data = read_test_data('culprit-commit.txt')
     self.assertEqual('ac9ee01fcbfac745aaedca0393a8e1c8a33acd8d',
                      self._test_test_commit('good', test_data, 0))  # pylint: disable=no-value-for-parameter


 class GetTargetArchToBuildTest(unittest.TestCase):
   """Tests for get_target_arch_to_build."""

   def test_unrecognized(self):
     """Test that an unrecognized architecture raises an exception."""
     with mock.patch('bisect_clang.execute') as mock_execute:
       mock_execute.return_value = (None, 'mips', None)
       with self.assertRaises(Exception):
         bisect_clang.get_clang_target_arch()

   def test_recognized(self):
     """Test that a recognized architecture returns the expected value."""
     arch_pairs = {'x86_64': 'X86', 'aarch64': 'AArch64'}
     for uname_result, clang_target in arch_pairs.items():
       with mock.patch('bisect_clang.execute') as mock_execute:
         mock_execute.return_value = (None, uname_result, None)
         self.assertEqual(clang_target, bisect_clang.get_clang_target_arch())
	# Copyright 2019 Google Inc.
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.
	#
	################################################################################
	"""Tests for bisect_clang.py"""
	import os
	from unittest import mock
	import unittest

	import bisect_clang

	FILE_DIRECTORY = os.path.dirname(__file__)
	LLVM_REPO_PATH = '/llvm-project'


	def get_git_command(*args):
	"""Returns a git command for the LLVM repo with \|args\| as arguments."""
	return ['git', '-C', LLVM_REPO_PATH] + list(args)


	def patch_environ(testcase_obj):
	"""Patch environment."""
	env = {}
	patcher = mock.patch.dict(os.environ, env)
	testcase_obj.addCleanup(patcher.stop)
	patcher.start()


	class BisectClangTestMixin: # pylint: disable=too-few-public-methods
	"""Useful mixin for bisect_clang unittests."""

	def setUp(self): # pylint: disable=invalid-name
	"""Initialization method for unittests."""
	patch_environ(self)
	os.environ['SRC'] = '/src'
	os.environ['WORK'] = '/work'


	class GetClangBuildEnvTest(BisectClangTestMixin, unittest.TestCase):
	"""Tests for get_clang_build_env."""

	def test_cflags(self):
	"""Test that CFLAGS are not used compiling clang."""
	os.environ['CFLAGS'] = 'blah'
	self.assertNotIn('CFLAGS', bisect_clang.get_clang_build_env())

	def test_cxxflags(self):
	"""Test that CXXFLAGS are not used compiling clang."""
	os.environ['CXXFLAGS'] = 'blah'
	self.assertNotIn('CXXFLAGS', bisect_clang.get_clang_build_env())

	def test_other_variables(self):
	"""Test that other env vars are used when compiling clang."""
	key = 'other'
	value = 'blah'
	os.environ[key] = value
	self.assertEqual(value, bisect_clang.get_clang_build_env()[key])


	def read_test_data(filename):
	"""Returns data from \|filename\| in the test_data directory."""
	with open(os.path.join(FILE_DIRECTORY, 'test_data', filename)) as file_handle:
	return file_handle.read()


	class SearchBisectOutputTest(BisectClangTestMixin, unittest.TestCase):
	"""Tests for search_bisect_output."""

	def test_search_bisect_output(self):
	"""Test that search_bisect_output finds the responsible commit when one
	exists."""
	test_data = read_test_data('culprit-commit.txt')
	self.assertEqual('ac9ee01fcbfac745aaedca0393a8e1c8a33acd8d',
	bisect_clang.search_bisect_output(test_data))

	def test_search_bisect_output_none(self):
	"""Test that search_bisect_output doesnt find a non-existent culprit
	commit."""
	self.assertIsNone(bisect_clang.search_bisect_output('hello'))


	def create_mock_popen(
	output=bytes('', 'utf-8'), err=bytes('', 'utf-8'), returncode=0):
	"""Creates a mock subprocess.Popen."""

	class MockPopen:
	"""Mock subprocess.Popen."""
	commands = []
	testcases_written = []

	def __init__(self, command, args, *kwargs): # pylint: disable=unused-argument
	"""Inits the MockPopen."""
	stdout = kwargs.pop('stdout', None)
	self.command = command
	self.commands.append(command)
	self.stdout = None
	self.stderr = None
	self.returncode = returncode
	if hasattr(stdout, 'write'):
	self.stdout = stdout

	def communicate(self, input_data=None): # pylint: disable=unused-argument
	"""Mock subprocess.Popen.communicate."""
	if self.stdout:
	self.stdout.write(output)

	if self.stderr:
	self.stderr.write(err)

	return output, err

	def poll(self, input_data=None): # pylint: disable=unused-argument
	"""Mock subprocess.Popen.poll."""
	return self.returncode

	return MockPopen


	def mock_prepare_build_impl(llvm_project_path): # pylint: disable=unused-argument
	"""Mocked prepare_build function."""
	return '/work/llvm-build'


	class BuildClangTest(BisectClangTestMixin, unittest.TestCase):
	"""Tests for build_clang."""

	def test_build_clang_test(self):
	"""Tests that build_clang works as intended."""
	with mock.patch('subprocess.Popen', create_mock_popen()) as mock_popen:
	with mock.patch('bisect_clang.prepare_build', mock_prepare_build_impl):
	llvm_src_dir = '/src/llvm-project'
	bisect_clang.build_clang(llvm_src_dir)
	self.assertEqual([['ninja', '-C', '/work/llvm-build', 'install']],
	mock_popen.commands)


	class GitRepoTest(BisectClangTestMixin, unittest.TestCase):
	"""Tests for GitRepo."""

	# TODO(metzman): Mock filesystem. Until then, use a real directory.

	def setUp(self):
	super().setUp()
	self.git = bisect_clang.GitRepo(LLVM_REPO_PATH)
	self.good_commit = 'good_commit'
	self.bad_commit = 'bad_commit'
	self.test_command = 'testcommand'

	def test_do_command(self):
	"""Test do_command creates a new process as intended."""
	# TODO(metzman): Test directory changing behavior.
	command = ['subcommand', '--option']
	with mock.patch('subprocess.Popen', create_mock_popen()) as mock_popen:
	self.git.do_command(command)
	self.assertEqual([get_git_command('subcommand', '--option')],
	mock_popen.commands)

	def _test_test_start_commit_unexpected(self, label, commit, returncode):
	"""Tests test_start_commit works as intended when the test returns an
	unexpected value."""

	def mock_execute_impl(command, args, *kwargs): # pylint: disable=unused-argument
	if command == self.test_command:
	return returncode, '', ''
	return 0, '', ''

	with mock.patch('bisect_clang.execute', mock_execute_impl):
	with mock.patch('bisect_clang.prepare_build', mock_prepare_build_impl):
	with self.assertRaises(bisect_clang.BisectError):
	self.git.test_start_commit(commit, label, self.test_command)

	def test_test_start_commit_bad_zero(self):
	"""Tests test_start_commit works as intended when the test on the first bad
	commit returns 0."""
	self._test_test_start_commit_unexpected('bad', self.bad_commit, 0)

	def test_test_start_commit_good_nonzero(self):
	"""Tests test_start_commit works as intended when the test on the first good
	commit returns nonzero."""
	self._test_test_start_commit_unexpected('good', self.good_commit, 1)

	def test_test_start_commit_good_zero(self):
	"""Tests test_start_commit works as intended when the test on the first good
	commit returns 0."""
	self._test_test_start_commit_expected('good', self.good_commit, 0) # pylint: disable=no-value-for-parameter

	@mock.patch('bisect_clang.build_clang')
	def _test_test_start_commit_expected(self, label, commit, returncode,
	mock_build_clang):
	"""Tests test_start_commit works as intended when the test returns an
	expected value."""
	command_args = []

	def mock_execute_impl(command, args, *kwargs): # pylint: disable=unused-argument
	command_args.append(command)
	if command == self.test_command:
	return returncode, '', ''
	return 0, '', ''

	with mock.patch('bisect_clang.execute', mock_execute_impl):
	self.git.test_start_commit(commit, label, self.test_command)
	self.assertEqual([
	get_git_command('checkout', commit), self.test_command,
	get_git_command('bisect', label)
	], command_args)
	mock_build_clang.assert_called_once_with(LLVM_REPO_PATH)

	def test_test_start_commit_bad_nonzero(self):
	"""Tests test_start_commit works as intended when the test on the first bad
	commit returns nonzero."""
	self._test_test_start_commit_expected('bad', self.bad_commit, 1) # pylint: disable=no-value-for-parameter

	@mock.patch('bisect_clang.GitRepo.test_start_commit')
	def test_bisect_start(self, mock_test_start_commit):
	"""Tests bisect_start works as intended."""
	with mock.patch('subprocess.Popen', create_mock_popen()) as mock_popen:
	self.git.bisect_start(self.good_commit, self.bad_commit,
	self.test_command)
	self.assertEqual(get_git_command('bisect', 'start'),
	mock_popen.commands[0])
	mock_test_start_commit.assert_has_calls([
	mock.call('bad_commit', 'bad', 'testcommand'),
	mock.call('good_commit', 'good', 'testcommand')
	])

	def test_do_bisect_command(self):
	"""Test do_bisect_command executes a git bisect subcommand as intended."""
	subcommand = 'subcommand'
	with mock.patch('subprocess.Popen', create_mock_popen()) as mock_popen:
	self.git.do_bisect_command(subcommand)
	self.assertEqual([get_git_command('bisect', subcommand)],
	mock_popen.commands)

	@mock.patch('bisect_clang.build_clang')
	def _test_test_commit(self, label, output, returncode, mock_build_clang):
	"""Test test_commit works as intended."""
	command_args = []

	def mock_execute_impl(command, args, *kwargs): # pylint: disable=unused-argument
	command_args.append(command)
	if command == self.test_command:
	return returncode, output, ''
	return 0, output, ''

	with mock.patch('bisect_clang.execute', mock_execute_impl):
	result = self.git.test_commit(self.test_command)
	self.assertEqual([self.test_command,
	get_git_command('bisect', label)], command_args)
	mock_build_clang.assert_called_once_with(LLVM_REPO_PATH)
	return result

	def test_test_commit_good(self):
	"""Test test_commit labels a good commit as good."""
	self.assertIsNone(self._test_test_commit('good', '', 0)) # pylint: disable=no-value-for-parameter

	def test_test_commit_bad(self):
	"""Test test_commit labels a bad commit as bad."""
	self.assertIsNone(self._test_test_commit('bad', '', 1)) # pylint: disable=no-value-for-parameter

	def test_test_commit_culprit(self):
	"""Test test_commit returns the culprit"""
	test_data = read_test_data('culprit-commit.txt')
	self.assertEqual('ac9ee01fcbfac745aaedca0393a8e1c8a33acd8d',
	self._test_test_commit('good', test_data, 0)) # pylint: disable=no-value-for-parameter


	class GetTargetArchToBuildTest(unittest.TestCase):
	"""Tests for get_target_arch_to_build."""

	def test_unrecognized(self):
	"""Test that an unrecognized architecture raises an exception."""
	with mock.patch('bisect_clang.execute') as mock_execute:
	mock_execute.return_value = (None, 'mips', None)
	with self.assertRaises(Exception):
	bisect_clang.get_clang_target_arch()

	def test_recognized(self):
	"""Test that a recognized architecture returns the expected value."""
	arch_pairs = {'x86_64': 'X86', 'aarch64': 'AArch64'}
	for uname_result, clang_target in arch_pairs.items():
	with mock.patch('bisect_clang.execute') as mock_execute:
	mock_execute.return_value = (None, uname_result, None)
	self.assertEqual(clang_target, bisect_clang.get_clang_target_arch())