def METHOD_NAME(b, create_tx, alice):
    create_tx.metadata = {'a': 1}
    signed_tx = create_tx.sign([alice.private_key])
    validate(signed_tx)
    create_tx._id = None
    create_tx.fulfillment = None
    create_tx.metadata = None
    signed_tx = create_tx.sign([alice.private_key])
    validate(signed_tx)
    create_tx._id = None
    create_tx.fulfillment = None
    create_tx.metadata = {}
    signed_tx = create_tx.sign([alice.private_key])
    validate_raises(signed_tx)