Junit：对于每个循环 [暂停]

Question

Question: I want to write a test case for For-Each loop?

for(Car car : Cars){
    Engine.set(car)
}

How write a Junit test case for this. Kindly explain for this.

Answer 1

This question is very open ended and the code itself isn't written to be easily tested as Engine.set is a static function. If you are only concerned about the end result then you could do something like this:

@Test
public void sampleEngineTestForStackOverflow() {
    setCarForEngine(); // This function would run the foreach loop in your example

    assertEquals(Engine.getCar(), lastCar)
}

I'm assuming that since you can set a Car to the Engine you would also have a getCar() method. The value of lastCar would be the last Car which was set to the Engine instance. Unfortunately as the question doesn't include other information it's difficult to provide more information other than this.

If you need to verify that the Engine.set method is called multiple times then you would need to use PowerMock to first mock the Engine instance and then you could use Mockito to verify the different Car instances that were set. Alternatively the code could be refactored to not use static instances and you'd have a much easier time with testing.