'Test raises with a single exception which gets raised.'

@pytest.mark.parametrize('exception,    value,    expected', [(ValueError, 'a', True), ((ValueError, TypeError), 'a', True), ((ValueError, TypeError), None, True), (ValueError, '1', False), ((ValueError, TypeError), 1, False)])
def test_raises_int(self, exception, value, expected):

    assert (utils.raises(exception, int, value) == expected)
