How to use the cryptoconditions.Ed25519Sha256.from_uri function in cryptoconditions

def test_validate_inputs_of_transfer_tx_with_invalid_params(
        transfer_tx, cond_uri, utx, user2_pub, user_priv, ffill_uri):
    from bigchaindb.common.transaction import Output
    from cryptoconditions import Ed25519Sha256

    invalid_out = Output(Ed25519Sha256.from_uri(ffill_uri), ['invalid'])
    assert transfer_tx.inputs_valid([invalid_out]) is False
    invalid_out = utx.outputs[0]
    invalid_out.public_key = 'invalid'
    assert transfer_tx.inputs_valid([invalid_out]) is True

    with raises(TypeError):
        assert transfer_tx.inputs_valid(None) is False
    with raises(AttributeError):
        transfer_tx.inputs_valid('not a list')
    with raises(ValueError):
        transfer_tx.inputs_valid([])
    with raises(TypeError):
        transfer_tx.operation = "Operation that doesn't exist"
        transfer_tx.inputs_valid([utx.outputs[0]])