@Test
  public void testSelectWorkItemsByMakeAndYear() throws ParseException {
    Manufacturer ford = new Manufacturer("ford");
    Manufacturer toyota = new Manufacturer("toyota");
    Car focus = new Car(2008, ford, "Focus", "4 cylinder");
    Car f150 = new Car(2010, ford, "F-150", "High HP");
    Car camry = new Car(2011, toyota, "Camry", "Sedan");
    Provider tiresPlus = new Provider("Tires Plus", "Bellevue");

    WorkItem workItem1 = buildWorkItem("01/01/2012", focus, tiresPlus);
    WorkItem workItem2 = buildWorkItem("12/31/2012", f150, tiresPlus);
    WorkItem workItem3 = buildWorkItem("01/01/2013", camry, tiresPlus);
    WorkItem workItem4 = buildWorkItem("12/31/2013", f150, tiresPlus);
    WorkItem workItem5 = buildWorkItem("12/01/2013", focus, tiresPlus);
    List<WorkItem> allWorkItems =
        Arrays.asList(workItem1, workItem2, workItem3, workItem4, workItem5);

    Collection<WorkItem> results =
        service.selectWorkItemsByMakeAndYear("ford", "2013", allWorkItems);
    assertThat(results, containsInAnyOrder(workItem3, workItem5));

    results = service.selectWorkItemsByMakeAndYear("ford", "2012", allWorkItems);
    assertThat(results, containsInAnyOrder(workItem1, workItem2));

    results = service.selectWorkItemsByMakeAndYear("chevy", "2013", allWorkItems);
    assertThat(results, empty());

    results = service.selectWorkItemsByMakeAndYear("ford", "2014", allWorkItems);
    assertThat(results, empty());
  }