mirror of
https://github.com/Kozea/WeasyPrint.git
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126 lines
3.7 KiB
Python
126 lines
3.7 KiB
Python
"""
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weasyprint.tests.testing_utils
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------------------------------
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Helpers for tests.
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"""
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import contextlib
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import functools
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import logging
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import os.path
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import sys
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import threading
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import wsgiref.simple_server
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from weasyprint import CSS, HTML
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from weasyprint.logger import LOGGER
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from weasyprint.urls import path2url
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# Lists of fonts with many variants (including condensed)
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if sys.platform.startswith('win'): # pragma: no cover
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SANS_FONTS = 'DejaVu Sans, Arial Nova, Arial, sans'
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MONO_FONTS = 'Courier New, Courier, monospace'
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else: # pragma: no cover
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SANS_FONTS = 'DejaVu Sans, sans'
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MONO_FONTS = 'DejaVu Sans Mono, monospace'
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TEST_UA_STYLESHEET = CSS(filename=os.path.join(
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os.path.dirname(__file__), '..', 'weasyprint', 'css', 'tests_ua.css'
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))
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class FakeHTML(HTML):
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"""Like weasyprint.HTML, but with a lighter UA stylesheet."""
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def _ua_stylesheets(self):
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return [TEST_UA_STYLESHEET]
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def resource_filename(basename):
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"""Return the absolute path of the resource called ``basename``."""
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return os.path.join(os.path.dirname(__file__), 'resources', basename)
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# Dummy filename, but in the right directory.
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BASE_URL = path2url(resource_filename('<test>'))
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class CallbackHandler(logging.Handler):
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"""A logging handler that calls a function for every message."""
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def __init__(self, callback):
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logging.Handler.__init__(self)
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self.emit = callback
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@contextlib.contextmanager
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def capture_logs():
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"""Return a context manager that captures all logged messages."""
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logger = LOGGER
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messages = []
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def emit(record):
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if record.name == 'weasyprint.progress':
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return
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messages.append(f'{record.levelname.upper()}: {record.getMessage()}')
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previous_handlers = logger.handlers
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previous_level = logger.level
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logger.handlers = []
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logger.addHandler(CallbackHandler(emit))
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logger.setLevel(logging.DEBUG)
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try:
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yield messages
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finally:
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logger.handlers = previous_handlers
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logger.level = previous_level
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def assert_no_logs(function):
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"""Decorator that asserts that nothing is logged in a function."""
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@functools.wraps(function)
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def wrapper(*args, **kwargs):
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with capture_logs() as logs:
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try:
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function(*args, **kwargs)
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except Exception: # pragma: no cover
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if logs:
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print(f'{len(logs)} errors logged:', file=sys.stderr)
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for message in logs:
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print(message, file=sys.stderr)
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raise
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else:
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if logs: # pragma: no cover
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for message in logs:
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print(message, file=sys.stderr)
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raise AssertionError(f'{len(logs)} errors logged')
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return wrapper
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@contextlib.contextmanager
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def http_server(handlers):
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def wsgi_app(environ, start_response):
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handler = handlers.get(environ['PATH_INFO'])
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if handler:
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status = str('200 OK')
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response, headers = handler(environ)
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headers = [(str(name), str(value)) for name, value in headers]
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else: # pragma: no cover
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status = str('404 Not Found')
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response = b''
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headers = []
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start_response(status, headers)
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return [response]
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# Port 0: let the OS pick an available port number
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# http://stackoverflow.com/a/1365284/1162888
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server = wsgiref.simple_server.make_server('127.0.0.1', 0, wsgi_app)
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_host, port = server.socket.getsockname()
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thread = threading.Thread(target=server.serve_forever)
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thread.start()
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try:
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yield f'http://127.0.0.1:{port}'
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finally:
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server.shutdown()
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thread.join()
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