mirror of
https://github.com/Kozea/WeasyPrint.git
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96 lines
2.6 KiB
Python
96 lines
2.6 KiB
Python
# coding: utf8
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"""
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weasyprint.tests.testing_utils
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------------------------------
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Helpers for tests.
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:copyright: Copyright 2011-2012 Simon Sapin and contributors, see AUTHORS.
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:license: BSD, see LICENSE for details.
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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, CSS
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from ..document import Document
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from ..backends import PNGBackend
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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(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(Document):
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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, user_stylesheets=(),
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user_agent_stylesheets=(TEST_UA_STYLESHEET,)):
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super(TestPNGDocument, self).__init__(
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PNGBackend,
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HTML(string=html_source, base_url=base_url).root_element,
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user_stylesheets=user_stylesheets,
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user_agent_stylesheets=user_agent_stylesheets)
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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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logger = LOGGER
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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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previous_handlers = 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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logger.handlers = previous_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: # pragma: no cover
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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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