Mockito 3 Answerer CALLS REAL METHODS

Methods that cannot be mocked, legacy code, unstubbed methods, or scenarios where we do need to call the real method, Mockito provides CALLS_REAL_METHODS. It's a way to create a partial mock object that calls real methods.

If CALLS_REAL_METHODS is not used then un-stubbed methods will use Nice Mock and return null.

package com.example.mokito3.sujan;

public class AppleService {
    public String saveApple(String apple) {
        String appleString = "i love " + apple + " apple";
        System.out.println("appleString = " + appleString);
        return appleString;
    }
}

package com.example.mokito3.sujan;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.junit.jupiter.MockitoExtension;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Answers.CALLS_REAL_METHODS;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;

@ExtendWith(MockitoExtension.class)
public class AppleServiceTest {
    @Mock(answer = CALLS_REAL_METHODS)
    private AppleService appleService;

    @Test
    void saveAppleWithStaticMockTest() {
        AppleService appleService = mock(AppleService.class, Mockito.CALLS_REAL_METHODS);
        String apple = appleService.saveApple("Macintosh");
        verify(appleService).saveApple("Macintosh");
        assertEquals("i love Macintosh apple", apple);
    }

    @Test
    void saveAppleWithAnnotationMockTest() {
        String apple = appleService.saveApple("Macintosh");
        verify(appleService).saveApple("Macintosh");
        assertEquals("i love Macintosh apple", apple);
    }
}

plugins {
    id 'java'
}

group 'org.example'
version '1.0-SNAPSHOT'

repositories { jcenter() }
dependencies {
    testImplementation('org.junit.jupiter:junit-jupiter:5.6.2')
    testCompile 'org.mockito:mockito-junit-jupiter:3.4.4'
}
test {
    useJUnitPlatform()
}

CALLS_REAL_METHODS only works for methods that are not stubbed, if methods are stubbed then they will return the stubbed response.

Mockito#when has precedence over Mockito#CALLS_REAL_METHODS

package com.example.mokito3.sujan;

public class AppleService {
    public String saveApple(String apple) {
        String appleString = "i love " + apple + " apple";
        System.out.println("appleString = " + appleString);
        return appleString;
    }
}

package com.example.mokito3.sujan;

import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.mockito.Mock;
import org.mockito.Mockito;
import org.mockito.junit.jupiter.MockitoExtension;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.mockito.Answers.CALLS_REAL_METHODS;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

@ExtendWith(MockitoExtension.class)
public class AppleServiceTest {
    @Mock(answer = CALLS_REAL_METHODS)
    private AppleService appleService;

    @Test
    void saveAppleWithStaticMockTest() {
        AppleService appleService = mock(AppleService.class, Mockito.CALLS_REAL_METHODS);
        when(appleService.saveApple("Macintosh")).thenReturn("i have apple");
        String apple = appleService.saveApple("Macintosh");
        verify(appleService).saveApple("Macintosh");
        assertEquals("i have apple", apple);
    }

    @Test
    void saveAppleWithAnnotationMockTest() {
        when(appleService.saveApple("Macintosh")).thenReturn("i have apple");
        String apple = appleService.saveApple("Macintosh");
        verify(appleService).saveApple("Macintosh");
        assertEquals("i have apple", apple);
    }
}

plugins {
    id 'java'
}

group 'org.example'
version '1.0-SNAPSHOT'

repositories { jcenter() }
dependencies {
    testImplementation('org.junit.jupiter:junit-jupiter:5.6.2')
    testCompile 'org.mockito:mockito-junit-jupiter:3.4.4'
}
test {
    useJUnitPlatform()
}

Mockito 3 Answerer CALLS REAL METHODS

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