Unlock 30% off on Manual Testing Annual Plans this Holiday Season.

Copied to Clipboard!

How to use _assert_raises_context_manager method in Testify

Best Python code snippet using Testify_python

assertions.py

Source:assertions.py

...105    ...     raise Exception106    >>> assert_raises(Exception, raise_exception, 1, kwarg=234)107    """108    if (len(args) == 1) and not kwargs:109        return _assert_raises_context_manager(args[0])110    else:111        return _assert_raises(*args, **kwargs)112def assert_raises_such_that(exception_class, exception_test=lambda e: e, callable_obj=None, *args, **kwargs):113    """114    Assert that an exception is raised such that expection_test(exception)115    passes, either in a with statement via a context manager or while calling116    a given callable on given arguments.117    Arguments:118        exception_class - class corresponding to the expected exception119        exception_test - a callable which takes an exception instance and120            asserts things about it121        callable_obj, *args, **kwargs - optional, a callable object and122            arguments to pass into it which when used are expected to raise the123            exception; if not provided, this function returns a context manager124            which will check that the assertion is raised within the context125            (the body of the with statement).126    As a context manager:127    >>> says_whatever = lambda e: assert_equal(str(e), "whatever")128    >>> with assert_raises_such_that(Exception, says_whatever):129    ...     raise Exception("whatever")130    Pass in a callable:131    >>> says_whatever = lambda e: assert_equal(str(e), "whatever")132    >>> def raise_exception(arg, kwarg=None):133    ...     raise Exception("whatever")134    >>> assert_raises_such_that(Exception, says_whatever, raise_exception, 1, kwarg=234)135    """136    if callable_obj is None:137        return _assert_raises_context_manager(exception_class, exception_test)138    else:139        with _assert_raises_context_manager(exception_class, exception_test):140            callable_obj(*args, **kwargs)141def assert_raises_exactly(exception_class, *args):142    """143    Assert that a particular exception_class is raised with particular arguments.144    Use this assertion when the exception message is important.145    """146    def test_exception(exception):147        # We want to know the exact exception type, not that it has some superclass.148        assert_is(type(exception), exception_class)149        assert_equal(exception.args, args)150    return assert_raises_such_that(exception_class, test_exception)151def assert_raises_and_contains(expected_exception_class, strings, callable_obj, *args, **kwargs):152    """Assert an exception is raised by passing in a callable and its153    arguments and that the string representation of the exception154    contains the case-insensitive list of passed in strings.155    Args156        strings -- can be a string or an iterable of strings157    """158    try:159        callable_obj(*args, **kwargs)160    except expected_exception_class as e:161        message = str(e).lower()162        try:163            is_string = isinstance(strings, basestring)164        except NameError:165            is_string = isinstance(strings, str)166        if is_string:167            strings = [strings]168        for string in strings:169            assert_in(string.lower(), message)170    else:171        assert_not_reached("No exception was raised (expected %s)" % expected_exception_class)172@contextlib.contextmanager173def _assert_raises_context_manager(exception_class, exception_test=lambda e: e):174    """Builds a context manager for testing that code raises an assertion.175    Args:176        exception_class - a subclass of Exception177        exception_test - optional, a function to apply to the exception (to178            test something about it)179    """180    try:181        yield182    except exception_class as e:183        exception_test(e)184    else:185        assert_not_reached("No exception was raised (expected %r)" %186                           exception_class)187def _assert_raises(exception_class, callable, *args, **kwargs):188    with _assert_raises_context_manager(exception_class):189        callable(*args, **kwargs)190def _diff_message(lhs, rhs):191    """If `lhs` and `rhs` are strings, return the a formatted message192    describing their differences. If they're not strings, describe the193    differences in their `repr()`s.194    NOTE: Only works well for strings not containing newlines.195    """196    lhs = _to_characters(lhs)197    rhs = _to_characters(rhs)198    message = u'Diff:\nl: %s\nr: %s' % stringdiffer.highlight(lhs, rhs)199    # Python2 exceptions require bytes.200    if six.PY2:201        return message.encode('UTF-8')202    else:...

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.