CODEWITHSUNDEEP
javaunit-testingjunitjacoco
Manisha Murali
Manisha Murali

Reputation: 49

How to include the Catch block in code coverage : JaCoCo and Junit

I'm quite new to Junit and JaCoCo. I'm trying to add test case for the catch block. But my JaCoCo code coverage is still asking me to cover the catch block in code coverage. Following is my method and testcase.

public Student addStudent(Student Stu) throws CustomException {
    try {
        // My Business Logic
        return Student;
    } catch (Exception e) {
        throw new CustomException("Exception while Adding Student ", e);
    }
}

@SneakyThrows
@Test
public void cautionRunTimeException(){
    when(studentService.addStudent(student)).thenThrow(RuntimeException.class);
    assertThrows(RuntimeException.class,()-> studentService.addStudent(student));
    verify(studentService).addStudent(student);
}

enter image description here

Please share me the correct way for the code coverage of catch block.

Note: JaCoCo version: 0.8.5, Junit version; junit5, Java version: 11

Upvotes: 0

Views: 3378

Answers (1)

Petr Aleksandrov
Petr Aleksandrov

Reputation: 1524

Your cautionRunTimeException test doesn't make much sense because currently the whole studentService#addStudent method is mocked. So ()-> studentService.addStudent(student) call doesn't execute real method in studentService.

If you want to test studentService it mustn't be mocked. You rather need to mock part of My Business Logic section to throw the exception.

Just an example:

    public Student addStudent(Student stu) throws CustomException {
        try {
            Student savedStudent = myBusinessLogic.addStudent(stu);
            return student;
        } catch (Exception e) {
            throw new CustomException("Exception while Adding Student ", e);
        }
    }

    @SneakyThrows
    @Test
    public void cautionCustomException(){
        when(myBusinessLogic.addStudent(student)).thenThrow(RuntimeException.class);
        assertThrows(CustomException.class, ()-> studentService.addStudent(student));
    }

Upvotes: 2

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