Why the mockito is not compatible with jacoco?

[Nymph-fan]

Hello:
I'm glad to use mockito ,but when I use jacoco to count the coverage of unit test. The coverage always be 0.Is there any way to solve it?

[TimvdLippe]

Mockito should be compatible with jacoco. What is the version you are loading and could you create a minimal reproducible gist?

[Nymph-fan]

Thanks for reply. In maven configuration I use

<dependency>
    <groupId>org.mockito</groupId>
    <artifactId>mockito-all</artifactId>
    <version>1.9.0</version>
    <scope>test</scope>
 </dependency>

the source code is

public HelloWorld() {
}
public String testMethod1() {
    return "Hello World";
}
public int addMethod(int a, int b) {
    return a + b;
}

the test code is

@Test
public void testMethod1(){
    HelloWorld mock=mock(HelloWorld.class);
    when(mock.testMethod1()).thenReturn("Hello World");
    String resutlt=mock.testMethod1();
    Assert.assertEquals(resutlt,"Hello World");
}

then I use jacoco-maven-plugin to Statistical coverage，but the result of coverage is zero

---

EDITED by @bric3 : reformatted with proper markdown

[TimvdLippe]

Version 1.9.0 is quite old. Could you upgrade to a more recent version, preferably 2.7.12 or if you can not, 1.10.19. Also you are using mockito-all which is deprecated. Please use mockito-core instead.

[bric3]

@Nymph-fan Note this may depend on the jacoco version as well.

[Nymph-fan]

@bric3 @TimvdLippe I update mockito-core version to 1.10.19, jacoco-maven-plugin to 0.7.7。But the coverage is still 0. So I think jacoco can't count the coverage of unit test through mock frame or method

[bric3]

@Nymph-fan I cannot say what's wrong, however we don't support mockito 1.x anymore, the mock generation engine was CGLIB and may have issues regarding coverage. Mockito 2.x now uses ByteBuddy instead.

[TimvdLippe]

Since 1.x is not supported anymore and we have not received any issues with Mockito 2.x + Jacoco, I am going to close this issue. If you do encounter any issues with 2.x, please reopen. Thank you for your time!

[HanumanGokavarapu]

Even with mockito2.x+jacoco we are not getting coverage ,Coudl you please provide sample projecst

[Helias-Criouet]

For me the issue was in the Jacoco gradle task. The classDirectories needed to point to the ${buildDir}/intermediates/classes folder.

[linusjf]

I'm using Mockito 2.0.2-beta and no jacoco coverage is counted via the Maven Surefire plugin.
Same with mockito core 3.3.3.

Update:

Able to do it by using spy() to create a copy of object. That actually invokes the method on the original object.

https://www.baeldung.com/mockito-void-methods