Source code for apache_beam.runners.interactive.testing.integration.screen_diff

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"""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

  import chromedriver_binary  # pylint: disable=unused-import
  from needle.cases import NeedleTestCase
  from needle.driver import NeedleChrome
  from import Options
  from import By
  from import expected_conditions
  from import WebDriverWait
  _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(BaseTestCase, self).__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(BaseTestCase, self).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()