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Sam
Sam

Reputation: 798

How to mock constructor using Mockito

I have a question regarding one of the feature of mockito. On several blogs I have read that mocking constructor is not possible through mockito.

For one of my test case, currently it is done through powermockito but I want to remove it due to some performance issues.

Currently the code looks something like this:

Actual class:

public class TestClass {
    private ClassB classB;

    public TestClass(ClassB classB) {
       this.classB = classB;
    }
}

In my test class, I have code like this:

TestClass testClass = Mockito.mock(TestClass.class);
PowerMockito.whenNew(TestClass.class).withArguments(this.classB)
    .thenReturn(testClass);

So could anyone suggest me, is there any other way possible by which I can achieve the same thing through mockito? Also on some blogs, I found that injection a public method with constructor of the class inside and then mocking that method can do the trick. But wanted to know all other options to analyze.

Thanks

-Sam

Upvotes: 0

Views: 295

Answers (1)

Juanjo Berenguer
Juanjo Berenguer

Reputation: 789

I am not sure if that can help you. 

class MyClass {

            private final MySecondClass clazz;

            MyClass(MySecondClass clazz) {
                this.clazz = clazz;
            }

            public boolean executeDoSomething() {
                return clazz.doSomething();
            }
        }

And in the test you could mock the inner class:

@RunWith(MockitoJUnitRunner.class)
        public class MyClassTest {
            @Test
            public void MyClassTest() {
                MySecondClass mockedPerformer = Mockito.mock(MySecondClass.class);
                MyClass clazz = new MyClass(mockedPerformer);
                clazz.executeDoSomething();
            }
        }

I hope this helps you.

Upvotes: 2

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