def assert_union(self, collection1, collection2,
                     failure_message='Expected overlap between collections: "{}" and "{}"'):
        """
        Asserts that the union of two sets has at least one member (collections share at least one member)
        """
        assertion = lambda: len(collection1 or collection2) > 0
        failure_message = unicode(failure_message).format(collection1, collection2)
        self.webdriver_assert(assertion, failure_message)
Asserts that the union of two sets has at least one member (collections share at least one member)