Now that we are able to process one command (whatever that the command is), it is time to add the option to send a string of commands. The specification can be the following:

public void whenReceiveCommandsThenAllAreExecuted() {
  Location expected = location.copy();
  expected.turnRight();
  expected.forward();
  expected.turnLeft();
  expected.backward();
  ship.receiveCommands("rflb");
  assertEquals(ship.getLocation(), expected);
}

This is a bit longer, but is still not an overly complicated specification. We're passing commands rflb (right, forwards, left, and backwards) and expecting that the Location changes accordingly. As before, we're not verifying the end result (seeing whether the if coordinates have changed), but checking whether we are invoking the correct calls to helper methods.