我正在努力学习JUnit。在处理一个特定的问题时,我决定使用JUnitParams参数提供程序。我正在编写的测试方法的每一组参数都应该包含两个输入值和一个测试方法调用结果的列表:
private static final Object[] getConstraints() {
return new Object[]{
new Object[]{15, Equipment.WHITEBOARD, Arrays.asList(new Classroom[]{classroomA, classroomB})},
new Object[]{15, Equipment.PROJECTOR, Arrays.asList(new Classroom[]{classroomB})},
new Object[]{15, Equipment.MICROPHONE, Arrays.asList(new Classroom[]{classroomA})},
new Object[]{30, Equipment.WHITEBOARD, Arrays.asList(new Classroom[]{classroomB})},
new Object[]{30, Equipment.PROJECTOR, Arrays.asList(new Classroom[]{classroomB})},
new Object[]{30, Equipment.MICROPHONE, Arrays.asList(new Classroom[]{})},
new Object[]{45, Equipment.WHITEBOARD, Arrays.asList(new Classroom[]{})},
new Object[]{45, Equipment.PROJECTOR, Arrays.asList(new Classroom[]{})},
new Object[]{45, Equipment.MICROPHONE, Arrays.asList(new Classroom[]{})},
};
}
classroomA
和classroomB
实际上是在每次测试执行之前准备的Mockito存根:
@Before
public void setUp() {
classroomA = mock(Classroom.class);
classroomB = mock(Classroom.class);
classrooms = Arrays.asList(new Classroom[]{classroomA, classroomB});
when(classroomA.getName()).thenReturn("A");
when(classroomA.getCapacity()).thenReturn(20);
when(classroomA.getEquipment()).thenReturn(Arrays.asList(new Equipment[]{Equipment.WHITEBOARD, Equipment.MICROPHONE}));
when(classroomB.getName()).thenReturn("B");
when(classroomB.getCapacity()).thenReturn(40);
when(classroomB.getEquipment()).thenReturn(Arrays.asList(new Equipment[]{Equipment.WHITEBOARD, Equipment.PROJECTOR}));
bookingSystem = new BookingSystem(classrooms);
}
当我尝试使用前面提到的Classroom
对象列表时,就会出现问题:
@Test
@Parameters(method = "getConstraints")
public void shouldBookClassroomMeetingConstraints(int capacity, Equipment equipment, List<Classroom>
suitableClassrooms) {
Assert.assertTrue("Should book a classroom that has a minimum capacity of " + capacity + " and has " +
equipment,
suitableClassrooms.contains(bookingSystem.book(capacity, equipment, ANY_DAY_OF_WEEK, ANY_HOUR)));
}
调试显示,在第一次运行时,suitableClassrooms
包含2个对象,但进一步检查显示,所有元素都为null——我准备的存根不在那里。显然,测试不会通过或失败在它们应该通过或失败的地方。
在Mockito中使用JUnitParams有限制吗?或者我用错了吗?使用它们的正确方法是什么?
也有可能这是一种错误的单元测试技术。如果是这种情况,那么编写测试以验证方法调用的结果是否在给定数组中的正确方法是什么?
您的测试不起作用,因为JUnitParamsRunner
运行程序在调用@Before
方法之前甚至在@BeforeClass
之前收集测试参数(即调用getConstraints
方法)。所以CCD_ 9和CCD_。这就是为什么suitableClassrooms
由空元素组成的原因。
解决方案是在getConstraints()
方法中初始化classroomA
和classroomB
。
此外,我相信你可以在这里摆脱莫基托。Classroom
看起来像POJO,没有必要嘲笑POJO。在这种情况下,您只需要创建Classroom
实例并用必要的数据填充它。
您需要让类知道您正在使用Mockito运行测试用例。在类级别添加以下内容,它应该会起作用。
@RunWith(MockitoJUnitRunner.class)