#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You 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.
#
"""Module to conduct screen diff based notebook integration tests."""
# pytype: skip-file
import os
import platform
import threading
import unittest
from http.server import HTTPServer
from http.server import SimpleHTTPRequestHandler
import pytest
from apache_beam.runners.interactive import interactive_environment as ie
from apache_beam.runners.interactive.testing.integration import notebook_executor
try:
import chromedriver_binary # pylint: disable=unused-import
from needle.cases import NeedleTestCase
from needle.driver import NeedleChrome
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions
from selenium.webdriver.support.ui import WebDriverWait
_interactive_integration_ready = (
notebook_executor._interactive_integration_ready)
except ImportError:
_interactive_integration_ready = False
# Web elements will be rendered differently on different platforms. List all
# supported platforms with goldens here.
_SUPPORTED_PLATFORMS = ['Darwin', 'Linux']
[docs]class ScreenDiffIntegrationTestEnvironment(object):
"""A test environment to conduct screen diff integration tests for notebooks.
"""
def __init__(self, test_notebook_path, golden_dir, cleanup=True):
# type: (str, str, bool) -> None
assert _interactive_integration_ready, (
'[interactive_test] dependency is not installed.')
assert os.path.exists(golden_dir), '{} does not exist.'.format(golden_dir)
assert os.path.isdir(golden_dir), '{} is not a directory.'.format(
golden_dir)
self._golden_dir = golden_dir
self._notebook_executor = notebook_executor.NotebookExecutor(
test_notebook_path)
self._cleanup = cleanup
self._test_urls = {}
self._server = None
def __enter__(self):
self._notebook_executor.execute()
self._server = HTTPServer(('', 0), SimpleHTTPRequestHandler)
def start_serving(server):
server.serve_forever()
threading.Thread(
target=start_serving, args=[self._server], daemon=True).start()
for test_id, output_path in\
self._notebook_executor.output_html_paths.items():
self._test_urls[test_id] = self.base_url + output_path
return self
def __exit__(self, exc_type, exc_value, traceback):
if self._notebook_executor and self._cleanup:
self._notebook_executor.cleanup()
if self._server:
def stop_serving(server):
server.shutdown()
threading.Thread(
target=stop_serving, args=[self._server], daemon=True).start()
@property
def base_url(self):
"""The base url where the locally started server serving HTMLs generated by
notebook executions."""
assert self._server, 'Server has not started.'
host_n_port = self._server.server_address
return 'http://{}:{}/'.format(host_n_port[0], host_n_port[1])
@property
def test_urls(self):
"""Mapping from test_id/execution_id to urls serving the output HTML pages
generated by the corresponding notebook executions."""
return self._test_urls
@property
def notebook_path_to_test_id(self):
"""Mapping from input notebook paths to their obfuscated execution/test ids.
"""
return self._notebook_executor.notebook_path_to_execution_id
[docs]def should_skip():
"""Whether a screen diff test should be skipped."""
return not (
platform.system() in _SUPPORTED_PLATFORMS and
ie.current_env().is_interactive_ready and _interactive_integration_ready)
if should_skip():
@unittest.skip(
reason='[interactive] and [interactive_test] deps are both required.')
@pytest.mark.skip(
reason='[interactive] and [interactive_test] deps are both required.')
class BaseTestCase(unittest.TestCase):
"""A skipped base test case if interactive_test dependency is not installed.
"""
pass
else:
[docs] class BaseTestCase(NeedleTestCase):
"""A base test case to execute screen diff integration tests."""
# Whether the browser should be headless.
_headless = True
def __init__(self, *args, **kwargs):
"""Initializes a test.
Some kwargs that could be configured:
#. golden_dir=<path>. A directory path pointing to all the golden
screenshots as baselines for comparison.
#. test_notebook_dir=<path>. A path pointing to a directory of
notebook files in ipynb format.
#. headless=<True/False>. Whether the browser should be headless when
executing the tests.
#. golden_size=<(int, int)>. The size of the screenshot to take and
compare.
#. cleanup=<True/False>. Whether to clean up the output directory.
Should always be True in automated test environment. When debugging,
turn it False to manually check the output for difference.
#. threshold=<float>. An image difference threshold, when the image
pixel distance is bigger than the value, the test will fail.
"""
golden_root = kwargs.pop(
'golden_dir',
'apache_beam/runners/interactive/testing/integration/goldens')
self._golden_dir = os.path.join(golden_root, platform.system())
self._test_notebook_dir = kwargs.pop(
'test_notebook_dir',
'apache_beam/runners/interactive/testing/integration/test_notebooks')
BaseTestCase._headless = kwargs.pop('headless', True)
self._test_env = None
self._viewport_width, self._viewport_height = kwargs.pop(
'golden_size', (1024, 10000))
self._cleanup = kwargs.pop('cleanup', True)
self._threshold = kwargs.pop('threshold', 5000)
self.baseline_directory = os.path.join(os.getcwd(), self._golden_dir)
self.output_directory = os.path.join(
os.getcwd(), self._test_notebook_dir, 'output')
super().__init__(*args, **kwargs)
@classmethod
def get_web_driver(cls):
chrome_options = Options()
if cls._headless:
chrome_options.add_argument('--headless')
chrome_options.add_argument('--no-sandbox')
chrome_options.add_argument('--disable-dev-shm-usage')
chrome_options.add_argument('--force-color-profile=srgb')
return NeedleChrome(options=chrome_options)
def setUp(self):
self.set_viewport_size(self._viewport_width, self._viewport_height)
def run(self, result=None):
with ScreenDiffIntegrationTestEnvironment(self._test_notebook_dir,
self._golden_dir,
self._cleanup) as test_env:
self._test_env = test_env
super().run(result)
def explicit_wait(self):
"""Wait for common elements to be visible."""
WebDriverWait(self.driver, 5).until(
expected_conditions.visibility_of_element_located(
(By.TAG_NAME, 'facets-overview')))
WebDriverWait(self.driver, 5).until(
expected_conditions.visibility_of_element_located(
(By.TAG_NAME, 'facets-dive')))
def assert_all(self):
"""Asserts screenshots for all notebooks in the test_notebook_path."""
for test_id, test_url in self._test_env.test_urls.items():
self.driver.get(test_url)
self.explicit_wait()
self.assertScreenshot('body', test_id, self._threshold)
def assert_single(self, test_id):
"""Asserts the screenshot for a single test. The given test id will be the
name of the golden screenshot."""
test_url = self._test_env.test_urls.get(test_id, None)
assert test_url, '{} is not a valid test id.'.format(test_id)
self.driver.get(test_url)
self.explicit_wait()
self.assertScreenshot('body', test_id, self._threshold)
def assert_notebook(self, notebook_name):
"""Asserts the screenshot for a single notebook. The notebook with the
given notebook_name under test_notebook_dir will be executed and asserted.
"""
if not notebook_name.endswith('.ipynb'):
notebook_name += '.ipynb'
notebook_path = os.path.join(self._test_notebook_dir, notebook_name)
test_id = self._test_env.notebook_path_to_test_id.get(notebook_path, None)
assert test_id, 'Cannot find notebook with name {}.'.format(notebook_name)
self.assert_single(test_id)
# This file contains no tests. Below lines are purely for passing lint.
if __name__ == '__main__':
unittest.main()