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# Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""A helper class for comparing the failures and crashes between layout test
runs. The results from the last test run are stored in expected-failures.txt
and expected-crashes.txt in the layout test results directory."""
import errno
import os
import path_utils
import test_failures
import test_expectations
def PrintFilesFromSet(filenames, header_text, output, opt_expectations=None):
"""A helper method to print a list of files to output.
Args:
filenames: a list of absolute filenames
header_text: a string to display before the list of filenames
output: file descriptor to write the results to.
opt_expectations: expecations that failed for this test
"""
if not len(filenames):
return
filenames = list(filenames)
filenames.sort()
output.write("\n")
output.write("%s (%d):\n" % (header_text, len(filenames)))
output_string = " %s"
if opt_expectations:
output_string += " = %s" % opt_expectations
output_string += "\n"
for filename in filenames:
output.write(output_string % path_utils.RelativeTestFilename(filename))
class CompareFailures:
# A list of which TestFailure classes count as a failure vs a crash.
FAILURE_TYPES = (test_failures.FailureTextMismatch,
test_failures.FailureImageHashMismatch)
CRASH_TYPES = (test_failures.FailureCrash,)
HANG_TYPES = (test_failures.FailureTimeout,)
MISSING_TYPES = (test_failures.FailureMissingResult,
test_failures.FailureMissingImageHash)
def __init__(self, test_files, test_failures, expectations):
"""Read the past layout test run's failures from disk.
Args:
test_files is a set of the filenames of all the test cases we ran
test_failures is a dictionary mapping the test filename to a list of
TestFailure objects if the test failed
expectations is a TestExpectations object representing the
current test status
"""
self._test_files = test_files
self._test_failures = test_failures
self._expectations = expectations
self._CalculateRegressions()
def PrintRegressions(self, output):
"""Write the regressions computed by _CalculateRegressions() to output. """
# Print unexpected passes by category.
passes = self._regressed_passes
PrintFilesFromSet(passes & self._expectations.GetFixableFailures(),
"Expected to fail, but passed",
output)
PrintFilesFromSet(passes & self._expectations.GetFixableTimeouts(),
"Expected to timeout, but passed",
output)
PrintFilesFromSet(passes & self._expectations.GetFixableCrashes(),
"Expected to crash, but passed",
output)
PrintFilesFromSet(passes & self._expectations.GetIgnoredFailures(),
"Expected to fail (ignored), but passed",
output)
PrintFilesFromSet(passes & self._expectations.GetIgnoredTimeouts(),
"Expected to timeout (ignored), but passed",
output)
# Crashes should never be deferred.
PrintFilesFromSet(passes & self._expectations.GetFixableDeferredFailures(),
"Expected to fail (deferred), but passed",
output)
PrintFilesFromSet(passes & self._expectations.GetFixableDeferredTimeouts(),
"Expected to timeout (deferred), but passed",
output)
# Print real regressions.
PrintFilesFromSet(self._regressed_failures,
"Regressions: Unexpected failures",
output,
'FAIL')
PrintFilesFromSet(self._regressed_hangs,
"Regressions: Unexpected timeouts",
output,
'TIMEOUT')
PrintFilesFromSet(self._regressed_crashes,
"Regressions: Unexpected crashes",
output,
'CRASH')
PrintFilesFromSet(self._missing,
"Missing expected results",
output)
def _CalculateRegressions(self):
"""Calculate regressions from this run through the layout tests."""
worklist = self._test_files.copy()
passes = set()
crashes = set()
hangs = set()
missing = set()
failures = set()
for test, failure_types in self._test_failures.iteritems():
# Although each test can have multiple test_failures, we only put them
# into one list (either the crash list or the failure list). We give
# priority to a crash/timeout over others, and to missing results over
# a text mismatch.
is_crash = [True for f in failure_types if type(f) in self.CRASH_TYPES]
is_hang = [True for f in failure_types if type(f) in self.HANG_TYPES]
is_missing = [True for f in failure_types
if type(f) in self.MISSING_TYPES]
is_failure = [True for f in failure_types
if type(f) in self.FAILURE_TYPES]
expectations = self._expectations.GetExpectations(test)
if is_crash:
if not test_expectations.CRASH in expectations: crashes.add(test)
elif is_hang:
if not test_expectations.TIMEOUT in expectations: hangs.add(test)
elif is_missing:
missing.add(test)
elif is_failure:
if not test_expectations.FAIL in expectations: failures.add(test)
worklist.remove(test)
for test in worklist:
# Check that all passing tests are expected to pass.
expectations = self._expectations.GetExpectations(test)
if not test_expectations.PASS in expectations: passes.add(test)
self._regressed_passes = passes
self._regressed_crashes = crashes
self._regressed_hangs = hangs
self._missing = missing
self._regressed_failures = failures
def GetRegressions(self):
"""Returns a set of regressions from the test expectations. This is
used to determine which tests to list in results.html and the
right script exit code for the build bots. The list does not
include the unexpected passes."""
return (self._regressed_failures | self._regressed_hangs |
self._regressed_crashes | self._missing)
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