mirror of
https://github.com/Kozea/WeasyPrint.git
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108 lines
3.3 KiB
Python
108 lines
3.3 KiB
Python
# coding: utf8
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# WeasyPrint converts web documents (HTML, CSS, ...) to PDF.
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# Copyright (C) 2011-2012 Simon Sapin and contributors.
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# See AUTHORS for more details.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as
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# published by the Free Software Foundation, either version 3 of the
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# License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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WeasyPrint testing suite.
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"""
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from __future__ import division, unicode_literals, print_function
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import sys
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import os.path
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import logging
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import contextlib
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import functools
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from .. import HTML
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from ..document import PNGDocument
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from ..css import PARSER as CSS_PARSER
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from ..logger import LOGGER
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# TODO: find a way to not depend on a specific font
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FONTS = 'Liberation Sans, Arial'
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TEST_UA_STYLESHEET = CSS_PARSER.parseFile(os.path.join(
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os.path.dirname(__file__), '..', 'css', 'tests_ua.css'
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))
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class TestPNGDocument(PNGDocument):
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"""Like PNGDocument, but with a different user-agent stylesheet.
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This stylesheet is shorter, which makes tests faster.
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"""
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def __init__(self, html_source, base_url=None):
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super(TestPNGDocument, self).__init__(
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HTML(string=html_source, base_url=base_url).root_element,
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user_stylesheets=[],
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user_agent_stylesheets=[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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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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loggers = [LOGGER, logging.getLogger('CSSUTILS')]
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previous_handlers = []
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messages = []
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def emit(record):
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message = '%s: %s' % (record.levelname.upper(), record.getMessage())
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messages.append(message)
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print(message, file=sys.stderr)
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for logger in loggers:
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previous_handlers.append((logger, logger.handlers))
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logger.handlers = []
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logger.addHandler(CallbackHandler(emit))
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try:
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yield messages
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finally:
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for logger, handlers in previous_handlers:
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logger.handlers = handlers
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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():
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with capture_logs() as logs:
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try:
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function()
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except Exception:
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if logs:
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print('%i errors logged:' % len(logs), file=sys.stderr)
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raise
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else:
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assert len(logs) == 0, '%i errors logged:' % len(logs)
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return wrapper
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