How to mock spring injected classes using JMockit

Question

My code:

class A extends X {
    @Autowired
    B b;

    @Override
    method() {
        //do something
        b.callMethodInB;
        //do something
    }

}

class B extends X {
    @Autowired
    C c;

    @Override
    method() {
        //do something
        c.callMethodInC;
       //do something
    }

}

I need to test method() in A. So how to mock B. I'm using Junit4 and Jmockit.

Answer 1

Try something like this:

import org.junit.*;
import mockit.*;

public class ATest
{
    @Tested A a;
    @Injectable B b;

    @Test
    public void testMethod()
    {
        a.method();

        new Verifications() {{ b.callMethodInB(); }};
    }
}

JMockit automatically instantiates A with an injected B instance (from the mock field b), setting it to the a field in the test class. This is independent of the DI framework used (Spring).