An example of a test method that could go into PlaneTester.java:

  public void testSetGetScheduledTime() {
    Plane plane= new Plane("AC222", false, "Ottawa", 15);
    
    // set the take-off time
    plane.setScheduleTime(17);

    // get the take-off time
    assertEquals(17, plane.getScheduledTime());
  }
       
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  An example of a test method that could go into AirportTester.java:
        
  public void testPartiallyOccupied() {
    
    // Create four runways with no planes on them
    Runway eastRunway = new Runway("East");
    Runway westRunway = new Runway("West");
    Runway northRunway = new Runway("North");  
    Runway southRunway = new Runway("South");  
    
    // create an airport with the four unoccupied runways
    Airport airport= new Airport("Pearson", "Toronto", 20,
                    eastRunway, westRunway, northRunway, southRunway,
                    eastRunway);
    
    // confirm that the airport runways are not occupied
    assertEquals(false, airport.partiallyOccupied());
    
    // create a plane
    Plane jet = new Plane("AC222", false, "Ottawa", 15);
    
    // put a plane on one of the runways
    eastRunway.setPlane(jet);
    
    // confirm that the airport runways are now partially occupied
    assertEquals(true, airport.partiallyOccupied()); 
  }