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      1 # Copyright (c) 2011 Google Inc. All rights reserved.
      2 #
      3 # Redistribution and use in source and binary forms, with or without
      4 # modification, are permitted provided that the following conditions are
      5 # met:
      6 #
      7 #     * Redistributions of source code must retain the above copyright
      8 # notice, this list of conditions and the following disclaimer.
      9 #     * Redistributions in binary form must reproduce the above
     10 # copyright notice, this list of conditions and the following disclaimer
     11 # in the documentation and/or other materials provided with the
     12 # distribution.
     13 #     * Neither the name of Google Inc. nor the names of its
     14 # contributors may be used to endorse or promote products derived from
     15 # this software without specific prior written permission.
     16 #
     17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     18 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     19 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     20 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     21 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     22 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     23 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     27 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28 
     29 
     30 class ExpectedFailures(object):
     31     def __init__(self):
     32         self._failures = set()
     33 
     34     def _can_trust_results(self, results):
     35         if not results or not results.failure_limit_count():
     36             return False
     37         return len(results.failing_tests()) != 0 and len(results.failing_tests()) != results.failure_limit_count()
     38 
     39     def failures_were_expected(self, results):
     40         if not self._can_trust_results(results):
     41             return False
     42         return set(results.failing_tests()) <= self._failures
     43 
     44     def shrink_expected_failures(self, results, run_success):
     45         if run_success:
     46             self._failures = set()
     47         elif self._can_trust_results(results):
     48             # Remove all expected failures which are not in the new failing results.
     49             self._failures.intersection_update(set(results.failing_tests()))
     50 
     51     def grow_expected_failures(self, results):
     52         if not self._can_trust_results(results):
     53             return
     54         self._failures.update(results.failing_tests())
     55         # FIXME: Should we assert() here that expected_failures never crosses a certain size?
     56