Mock method in abstract class that inherit abstract class

Question

I have a service that extends abstract class in my spring-boot project

public class TestService extends AbstractTest1Service {
// some methods
}

public abstract class AbstractTest1Service extends AbstractTest2Service {

    public String doSomething() {
        return writeText();
    }
}


public abstract class AbstractTest2Service {

    String writeText() {
        return "text";
    }
}

Is there any way to mock writeText() method when i want to test TestService :

Answer 1

Your TestService class:

public class TestService extends AbstractTest1Service {
    AbstractTest2Service abstractTest2Service;

    public String doSomething() {
        abstractTest2Service.writeText();
        System.out.println("Passed!");
        return "All Checked";
    }
}

---

Your TestServiceTest class should be like:

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.InjectMocks;
import org.mockito.Mock;
import org.mockito.runners.MockitoJUnitRunner;

@RunWith(MockitoJUnitRunner.class)
public class TestServiceTest {
    @InjectMocks
    TestService testService;

    @Mock
    AbstractTest2Service abstractTest2Service;

    @Test
    public void testService(){
        Assert.assertEquals("All Checked",testService.doSomething());
    }
}

Note: Do not use @Spy instead of @Mock , Spy will try to check the actual implementation of the abstract class methods which is not there , so your test will be ignored. Just use @Mock .

Using @Spy will give error:

Cannot instantiate a @Spy for ' abstractTest2Service ' field. You haven't provided the instance for spying at field declaration so I tried to construct the instance. However, I failed because: the type ' AbstractTest2Service is an abstract class.