34     def _can_trust_results(self, results):  argument
35         if not results or not results.failure_limit_count():
37 …return len(results.failing_tests()) != 0 and len(results.failing_tests()) != results.failure_limit…
39     def failures_were_expected(self, results):  argument
40         if not self._can_trust_results(results):
42         return set(results.failing_tests()) <= self._failures
44     def shrink_expected_failures(self, results, run_success):  argument
47         elif self._can_trust_results(results):
49             self._failures.intersection_update(set(results.failing_tests()))
51     def grow_expected_failures(self, results):  argument
52         if not self._can_trust_results(results):
54         self._failures.update(results.failing_tests())