Trying to test to see if an object is an instance of an interface class.

[Snake006]

I am currently trying to use Junit to test a whole bunch of stuff. I almost have full line coverage but I am getting hung up on testing an if statement that consists of whether or not an object is an instance of another class. This class happens to be an interface, and even the object is an interface. Weird I know but I just want to know how to get into that if statement. I realize testing interfaces might be a waste of time but I still really want to know how. Here is an example of what I am trying to test:

if(x instance of y){  //where x and y are both interface objects
doSomething();
}

[Snake006]

Is there some way I can force the object x to be an instance of class y for testing purposes?

[jim829]

You don't have to force anything. Just assign the instances like you normally would. Then for any instance x, use the following method

if (x.getClass().isInstance(obj o)) {
  // do something
}

Check the Class API for detailed documentation.

Regards,
Jim