如何在对模拟静态方法的顺序调用中返回多个答案

Question

我有一个返回值的函数 java.net.InetAddress.getLocalHost().getHostName()我已经为我的函数编写了一个测试，如下所示：@PrepareForTest({InetAddress.class, ClassUnderTest.class})@Testpublic void testFunc() throws Exception, UnknownHostException {  final ClassUnderTest classUnderTest = new ClassUnderTest();  PowerMockito.mockStatic(InetAddress.class);   final InetAddress inetAddress = PowerMockito.mock(InetAddress.class);  PowerMockito.doReturn("testHost", "anotherHost").when(inetAddress, method(InetAddress.class, "getHostName")).withNoArguments();  PowerMockito.doReturn(inetAddress).when(InetAddress.class);  InetAddress.getLocalHost();  Assert.assertEquals("testHost", classUnderTest.printHostname());  Assert.assertEquals("anotherHost", classUnderTest.printHostname());  }printHostName简直就是return java.net.InetAddress.getLocalHost().getHostName();我将如何调用getHostName返回anotherHost第二个断言？我试过做：((PowerMockitoStubber)PowerMockito.doReturn("testHost", "anotherHost")).when(inetAddress, method(InetAddress.class, "getHostName")).withNoArguments();PowerMockito.doReturn("testHost", "anotherHost").when(inetAddress, method(InetAddress.class, "getHostName")).withNoArguments();我在这里尝试使用doAnswer解决方案：Using Mockito with multiple calls to the same method with the same arguments但没有效果，因为testHost两次仍然返回。

Answer 1

我尝试了您的代码，它按您的预期工作。我创建了被测方法，例如：

public String printHostname() throws Exception {

    return InetAddress.getLocalHost().getHostName();

}

和测试类：

@RunWith(PowerMockRunner.class)

public class ClassUnderTestTest {

    @PrepareForTest({InetAddress.class, ClassUnderTest.class})

    @Test

    public void testFunc() throws Exception {

        final ClassUnderTest classUnderTest = new ClassUnderTest();

        PowerMockito.mockStatic(InetAddress.class);

        final InetAddress inetAddress = PowerMockito.mock(InetAddress.class);

        PowerMockito.doReturn("testHost", "anotherHost")

                .when(inetAddress, PowerMockito.method(InetAddress.class, "getHostName"))

                .withNoArguments();

        PowerMockito.doReturn(inetAddress).when(InetAddress.class);

        InetAddress.getLocalHost();

        Assert.assertEquals("testHost", classUnderTest.printHostname());

        Assert.assertEquals("anotherHost", classUnderTest.printHostname());

    }

}