java - 我的模拟方法在每次调用时返回相同的实例，如何让它返回一个新实例？

Question

private mockedObject cpMock;

@Test
public void test() {

    Manager managerTest = new Manager(cpMock, size);

    Instance instance = new Instance(size);
    when(cpMock.requestInstance()).thenReturn(instance);

}

Answer 1

thenReturn 有一个重载，它有一个 var-arg 参数:

when(cpMock.requestInstance())
   .thenReturn(instance, instance1, instance2, instance3);

根据它的 javadocs，它将按顺序返回这些对象。从第 4 次调用开始，将返回 instance3(最后一个值):

Sets consecutive return values to be returned when the method is called. E.g: when(mock.someMethod()).thenReturn(1, 2, 3);
Last return value in the sequence (in example: 3) determines the behavior of further consecutive calls.