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#!/usr/bin/env python
# Copyright (C) 2010 Google Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Defines the interface TestTypeBase which other test types inherit from.
Also defines the TestArguments "struct" to pass them additional arguments.
"""
from __future__ import with_statement
import codecs
import cgi
import errno
import logging
import os.path
_log = logging.getLogger("webkitpy.layout_tests.test_types.test_type_base")
class TestArguments(object):
"""Struct-like wrapper for additional arguments needed by
specific tests."""
# Whether to save new baseline results.
new_baseline = False
# Path to the actual PNG file generated by pixel tests
png_path = None
# Value of checksum generated by pixel tests.
hash = None
# Whether to use wdiff to generate by-word diffs.
wdiff = False
# Python bug workaround. See the wdiff code in WriteOutputFiles for an
# explanation.
_wdiff_available = True
class TestTypeBase(object):
# Filename pieces when writing failures to the test results directory.
FILENAME_SUFFIX_ACTUAL = "-actual"
FILENAME_SUFFIX_EXPECTED = "-expected"
FILENAME_SUFFIX_DIFF = "-diff"
FILENAME_SUFFIX_WDIFF = "-wdiff.html"
FILENAME_SUFFIX_PRETTY_PATCH = "-pretty-diff.html"
FILENAME_SUFFIX_COMPARE = "-diff.png"
def __init__(self, port, root_output_dir):
"""Initialize a TestTypeBase object.
Args:
port: object implementing port-specific information and methods
root_output_dir: The unix style path to the output dir.
"""
self._root_output_dir = root_output_dir
self._port = port
def _make_output_directory(self, filename):
"""Creates the output directory (if needed) for a given test
filename."""
output_filename = os.path.join(self._root_output_dir,
self._port.relative_test_filename(filename))
self._port.maybe_make_directory(os.path.split(output_filename)[0])
def _save_baseline_data(self, filename, data, modifier, encoding,
generate_new_baseline=True):
"""Saves a new baseline file into the port's baseline directory.
The file will be named simply "<test>-expected<modifier>", suitable for
use as the expected results in a later run.
Args:
filename: path to the test file
data: result to be saved as the new baseline
modifier: type of the result file, e.g. ".txt" or ".png"
encoding: file encoding (none, "utf-8", etc.)
generate_new_baseline: whether to enerate a new, platform-specific
baseline, or update the existing one
"""
if generate_new_baseline:
relative_dir = os.path.dirname(
self._port.relative_test_filename(filename))
baseline_path = self._port.baseline_path()
output_dir = os.path.join(baseline_path, relative_dir)
output_file = os.path.basename(os.path.splitext(filename)[0] +
self.FILENAME_SUFFIX_EXPECTED + modifier)
self._port.maybe_make_directory(output_dir)
output_path = os.path.join(output_dir, output_file)
_log.debug('writing new baseline result "%s"' % (output_path))
else:
output_path = self._port.expected_filename(filename, modifier)
_log.debug('resetting baseline result "%s"' % output_path)
self._port.update_baseline(output_path, data, encoding)
def output_filename(self, filename, modifier):
"""Returns a filename inside the output dir that contains modifier.
For example, if filename is c:/.../fast/dom/foo.html and modifier is
"-expected.txt", the return value is
c:/cygwin/tmp/layout-test-results/fast/dom/foo-expected.txt
Args:
filename: absolute filename to test file
modifier: a string to replace the extension of filename with
Return:
The absolute windows path to the output filename
"""
output_filename = os.path.join(self._root_output_dir,
self._port.relative_test_filename(filename))
return os.path.splitext(output_filename)[0] + modifier
def compare_output(self, port, filename, test_args, actual_test_output,
expected_test_output):
"""Method that compares the output from the test with the
expected value.
This is an abstract method to be implemented by all sub classes.
Args:
port: object implementing port-specific information and methods
filename: absolute filename to test file
test_args: a TestArguments object holding optional additional
arguments
actual_test_output: a TestOutput object which represents actual test
output
expected_test_output: a TestOutput object which represents a expected
test output
Return:
a list of TestFailure objects, empty if the test passes
"""
raise NotImplementedError
def _write_into_file_at_path(self, file_path, contents, encoding):
"""This method assumes that byte_array is already encoded
into the right format."""
open_mode = 'w'
if encoding is None:
open_mode = 'w+b'
with codecs.open(file_path, open_mode, encoding=encoding) as file:
file.write(contents)
def write_output_files(self, filename, file_type,
output, expected, encoding,
print_text_diffs=False):
"""Writes the test output, the expected output and optionally the diff
between the two to files in the results directory.
The full output filename of the actual, for example, will be
<filename>-actual<file_type>
For instance,
my_test-actual.txt
Args:
filename: The test filename
file_type: A string describing the test output file type, e.g. ".txt"
output: A string containing the test output
expected: A string containing the expected test output
print_text_diffs: True for text diffs. (FIXME: We should be able to get this from the file type?)
"""
self._make_output_directory(filename)
actual_filename = self.output_filename(filename, self.FILENAME_SUFFIX_ACTUAL + file_type)
expected_filename = self.output_filename(filename, self.FILENAME_SUFFIX_EXPECTED + file_type)
# FIXME: This function is poorly designed. We should be passing in some sort of
# encoding information from the callers.
if output:
self._write_into_file_at_path(actual_filename, output, encoding)
if expected:
self._write_into_file_at_path(expected_filename, expected, encoding)
if not output or not expected:
return
if not print_text_diffs:
return
# Note: We pass encoding=None for all diff writes, as we treat diff
# output as binary. Diff output may contain multiple files in
# conflicting encodings.
diff = self._port.diff_text(expected, output, expected_filename, actual_filename)
diff_filename = self.output_filename(filename, self.FILENAME_SUFFIX_DIFF + file_type)
self._write_into_file_at_path(diff_filename, diff, encoding=None)
# Shell out to wdiff to get colored inline diffs.
wdiff = self._port.wdiff_text(expected_filename, actual_filename)
wdiff_filename = self.output_filename(filename, self.FILENAME_SUFFIX_WDIFF)
self._write_into_file_at_path(wdiff_filename, wdiff, encoding=None)
# Use WebKit's PrettyPatch.rb to get an HTML diff.
pretty_patch = self._port.pretty_patch_text(diff_filename)
pretty_patch_filename = self.output_filename(filename, self.FILENAME_SUFFIX_PRETTY_PATCH)
self._write_into_file_at_path(pretty_patch_filename, pretty_patch, encoding=None)
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