Testing Classes using java.util.Date with JMockit

A great article on LShift Ltd's blog discusses using JMockit to mock out System.currentTimeMillis():

@MockClass(realClass = System.class)
public class MockSystem {
    private Calendar now = null;

    public MockSystem(Calendar now) {
        this.now = now;
    }

    @Mock
    public long currentTimeMillis() {
        return now.getTimeInMillis();
    }
}