I am trying to use PowerMockito in order to test a static method in my service. I have the following test method:

@PrepareForTest(LoggingUtils.class)
@RunWith(PowerMockRunner.class)
public class SiteServiceImplTest {

    @Test
    public void test() {

        // code omitted

        PowerMockito.mockStatic(LoggingUtils.class);

        Page<SiteDTO> result = siteService.findAll(request, sort);

        PowerMockito.verifyStatic(LoggingUtils.class, Mockito.times(1));
    }
}

But when I run this test, it throws the following error:

org.mockito.exceptions.misusing.NotAMockException: Argument passed to verify() is of type Class and is not a mock! Make sure you place the parenthesis correctly! See the examples of correct verifications:
verify(mock).someMethod();
verify(mock, times(10)).someMethod();
verify(mock, atLeastOnce()).someMethod();

So, how can I use PowerMockito and test my static method?

The static method is as following:

LoggingUtils.info("The ...);

CodePudding user response：

Verification of a static method is done in two steps:

1. First call PowerMockito.verifyStatic(Static.class) to start verifying behavior and then
2. Call the static method of the Static.class to verify.

For example:

PowerMockito.verifyStatic(Static.class); // 1
Static.firstStaticMethod(param); // 2

See documentation

Your test should look:

@RunWith(PowerMockRunner.class)
@PrepareForTest(LoggingUtils.class)
public class ServiceTest {
    @Test
    public void test() {
        // mock all the static methods in a class called "LoggingUtils"
        PowerMockito.mockStatic(LoggingUtils.class);

        // execute your test
        ServiceSite siteService = new ServiceSite();
        siteService.find();

        // Different from Mockito, always use PowerMockito.verifyStatic(Class) first
        // to start verifying behavior
        PowerMockito.verifyStatic(LoggingUtils.class, Mockito.times(1));
        // IMPORTANT:  Call the static method you want to verify
        LoggingUtils.info(anyString());
    }
}

public class ServiceSite {
    SiteDTO find() {
        LoggingUtils.info("123");
        return new SiteDTO();
    }
}