@Test
public void testAgentActionNumber4() {
VacuumEnvironment tve = new VacuumEnvironment(
VacuumEnvironment.LocationState.Clean,
VacuumEnvironment.LocationState.Clean);
tve.addAgent(agent, VacuumEnvironment.LOCATION_B);
Assert.assertEquals(VacuumEnvironment.LOCATION_B,
tve.getAgentLocation(agent));
Assert.assertEquals(1, tve.getAgents().size());
tve.step(); // moves to location A