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import unittest

from webkitpy.tool.bot.expectedfailures import ExpectedFailures


class MockResults(object):
    def __init__(self, failing_tests=[], failure_limit=10):
        self._failing_tests = failing_tests
        self._failure_limit_count = failure_limit

    def failure_limit_count(self):
        return self._failure_limit_count

    def failing_tests(self):
        return self._failing_tests


class ExpectedFailuresTest(unittest.TestCase):
    def _assert_can_trust(self, results, can_trust):
        self.assertEquals(ExpectedFailures()._can_trust_results(results), can_trust)

    def test_can_trust_results(self):
        self._assert_can_trust(None, False)
        self._assert_can_trust(MockResults(failing_tests=[], failure_limit=None), False)
        self._assert_can_trust(MockResults(failing_tests=[], failure_limit=10), False)
        self._assert_can_trust(MockResults(failing_tests=[1], failure_limit=None), False)
        self._assert_can_trust(MockResults(failing_tests=[1], failure_limit=2), True)
        self._assert_can_trust(MockResults(failing_tests=[1], failure_limit=1), False)
        self._assert_can_trust(MockResults(failing_tests=[1, 2], failure_limit=1), False)

    def _assert_expected(self, expected_failures, failures, expected):
        self.assertEqual(expected_failures.failures_were_expected(MockResults(failures)), expected)

    def test_failures_were_expected(self):
        failures = ExpectedFailures()
        failures.grow_expected_failures(MockResults(['foo.html']))
        self._assert_expected(failures, ['foo.html'], True)
        self._assert_expected(failures, ['bar.html'], False)
        failures.shrink_expected_failures(MockResults(['baz.html']), False)
        self._assert_expected(failures, ['foo.html'], False)
        self._assert_expected(failures, ['baz.html'], False)

        failures.grow_expected_failures(MockResults(['baz.html']))
        self._assert_expected(failures, ['baz.html'], True)
        failures.shrink_expected_failures(MockResults(), True)
        self._assert_expected(failures, ['baz.html'], False)

    def test_unexpected_failures_observed(self):
        failures = ExpectedFailures()
        failures.grow_expected_failures(MockResults(['foo.html']))
        self.assertEquals(failures.unexpected_failures_observed(MockResults(['foo.html', 'bar.html'])), set(['bar.html']))
        self.assertEquals(failures.unexpected_failures_observed(MockResults(['baz.html'])), set(['baz.html']))
        unbounded_results = MockResults(['baz.html', 'qux.html', 'taco.html'], failure_limit=3)
        self.assertEquals(failures.unexpected_failures_observed(unbounded_results), set(['baz.html', 'qux.html', 'taco.html']))
        unbounded_results_with_existing_failure = MockResults(['foo.html', 'baz.html', 'qux.html', 'taco.html'], failure_limit=4)
        self.assertEquals(failures.unexpected_failures_observed(unbounded_results_with_existing_failure), set(['baz.html', 'qux.html', 'taco.html']))

    def test_unexpected_failures_observed_when_tree_is_hosed(self):
        failures = ExpectedFailures()
        failures.grow_expected_failures(MockResults(['foo.html', 'banana.html'], failure_limit=2))
        self.assertEquals(failures.unexpected_failures_observed(MockResults(['foo.html', 'bar.html'])), None)
        self.assertEquals(failures.unexpected_failures_observed(MockResults(['baz.html'])), None)
        unbounded_results = MockResults(['baz.html', 'qux.html', 'taco.html'], failure_limit=3)
        self.assertEquals(failures.unexpected_failures_observed(unbounded_results), None)
        unbounded_results_with_existing_failure = MockResults(['foo.html', 'baz.html', 'qux.html', 'taco.html'], failure_limit=4)
        self.assertEquals(failures.unexpected_failures_observed(unbounded_results_with_existing_failure), None)
