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How to use assert_warns_such_that method in Testify

Best Python code snippet using Testify_python

assertions_test.py

Source:assertions_test.py

...705        Test that assert_warns_such_that (used as a context manager)706        fails when the warnings_test method raises an exception.707        """708        with assertions.assert_raises(RuntimeError):709            with assertions.assert_warns_such_that(self._raise_exception):710                self._create_user_warning()711    def test_passes_when_warnings_test_returns_true(self):712        """713        Test that assert_warns_such_that (used as a context manager)714        passes when the warnings_test method returns True.715        This should happen if warnings is populated correctly.716        """717        def one_user_warning_caught(warnings):718            assert_equal([UserWarning], [w.category for w in warnings])719        with assertions.assert_warns_such_that(one_user_warning_caught):720            self._create_user_warning()721    def test_fails_when_warnings_test_raises_exception_with_callable(self):722        """723        Test that assert_warns_such_that (when given a callable object)724        fails when the warnings_test method raises an exception.725        """726        with assertions.assert_raises(RuntimeError):727            assertions.assert_warns_such_that(self._raise_exception,728                                              self._create_user_warning)729    def test_passes_when_warnings_test_returns_true_with_callable(self):730        """731        Test that assert_warns_such_that (when given a callable object)732        passes when the warnings_test method returns True.733        This should happen if warnings is populated correctly.734        """735        def create_multiple_warnings(warnings_count):736            for _ in range(warnings_count):737                self._create_user_warning()738        def three_warnings_caught(warnings):739            assert_equal(len(warnings), 3)740        assertions.assert_warns_such_that(three_warnings_caught,741                                          create_multiple_warnings, 3)742class DocTest(DocTestCase):743    module = assertions744if __name__ == '__main__':745    run()...

assertions.py

Source:assertions.py

...601        return _assert_warns_context_manager(warning_class=warning_class)602    else:603        with _assert_warns_context_manager(warning_class=warning_class):604            callable(*args, **kwargs)605def assert_warns_such_that(warnings_test, callable=None, *args, **kwargs):606    """607    Assert that the given warnings_test function returns True when608    called with a full list of warnings that were generated by either609    a code block (when this is used as a context manager in a `with` statement)610    or the given callable (when called with the appropriate args and kwargs).611    As a context manager:612    >>> def two_warnings_thrown(warnings):613    ...     assert len(warnings) == 2614    >>> with assert_warns_such_that(two_warnings_thrown):615    ...     warnings.warn('Hey!')616    ...     warnings.warn('Seriously!')617    Passing in a callable:618    >>> def throw_warnings(count):619    ...     for n in range(count):620    ...         warnings.warn('Warning #%i' % n)621    >>> assert_warns_such_that(two_warnings_thrown, throw_warnings, 2)622    """623    if callable is None:624        return _assert_warns_context_manager(warnings_test=warnings_test)625    else:626        with _assert_warns_context_manager(warnings_test=warnings_test):627            callable(*args, **kwargs)628def _to_characters(x):629    """Return characters that represent the object `x`, come hell or high water."""630    if isinstance(x, six.text_type):631        return x632    try:633        return six.text_type(x, 'UTF-8')634    except UnicodeDecodeError:635        return six.text_type(x, 'latin1')...

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