Exception : mockito wanted but not invoked, Actually there were zero interactions with this mock

Question

I have interface

Interface MyInterface {   myMethodToBeVerified (String, String); } 

And implementation of interface is

class MyClassToBeTested implements MyInterface {    myMethodToBeVerified(String, String) {     …….    } } 

I have another class

class MyClass {     MyInterface myObj = new MyClassToBeTested();     public void abc(){          myObj.myMethodToBeVerified (new String(“a”), new String(“b”));     } } 

I am trying to write JUnit for MyClass. I have done

class MyClassTest {     MyClass myClass = new MyClass();        @Mock     MyInterface myInterface;      testAbc(){          myClass.abc();          verify(myInterface).myMethodToBeVerified(new String(“a”), new String(“b”));     } } 

But I am getting mockito wanted but not invoked, Actually there were zero interactions with this mock at verify call.

can anyone suggest some solutions.

Answer 1

You need to inject mock inside the class you're testing. At the moment you're interacting with the real object, not with the mock one. You can fix the code in a following way:

void testAbc(){      myClass.myObj = myInteface;      myClass.abc();      verify(myInterface).myMethodToBeVerified(new String("a"), new String("b")); } 

although it would be a wiser choice to extract all initialization code into @Before

@Before void setUp(){      myClass = new myClass();      myClass.myObj = myInteface; }  @Test void testAbc(){      myClass.abc();      verify(myInterface).myMethodToBeVerified(new String("a"), new String("b")); } 

Answer 2

Your class MyClass creates a new MyClassToBeTested, instead of using your mock. My article on the Mockito wiki describes two ways of dealing with this.