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