def test_next_available_with_all_connected_attribute(self):
        sequence_manager = pm.ls(type=pm.nt.SequenceManager)[0]
        # connect new sequences
        seq1 = pm.createNode('sequence')
        seq2 = pm.createNode('sequence')
        seq3 = pm.createNode('sequence')

        seq1.message >> sequence_manager.sequences[0]
        seq2.message >> sequence_manager.sequences[1]
        seq3.message >> sequence_manager.sequences[2]

        attr = sequence_manager.sequences.next_available
        self.assertIsInstance(
            attr,
            pm.general.Attribute
        )
        self.assertEqual(
            3,
            sequence_manager.sequences.next_available.index()
        )
testing if the next available attribute will be returned when no
dataset/ETHPy150Open eoyilmaz/anima/tests/extension/maya.py/AttributeExtensionsTester.test_next_available_with_all_connected_attribute