Unit testing with mockito for constructors

Question

I have one class.

Class First {      private Second second;      public First(int num, String str) {         second = new Second(str);         this.num = num;     }      ... // some other methods } 

I want to write unit tests for public methods of class First. I want to avoid execution of constructor of class Second.

I did this:

Second second = Mockito.mock(Second.class); Mockito.when(new Second(any(String.class))).thenReturn(null); First first = new First(null, null); 

It is still calling constructor of class Second. How can i avoid it?

Answer 1

You can use PowerMockito

See the example:

Second second = Mockito.mock(Second.class); whenNew(Second.class).withNoArguments().thenReturn(second); 

But re-factoring is better decision.