Uncle Bob's Agile Development Corner
ObserverEvolving into a pattern, Part 1
by Robert C. Martin
Listing 1. ClockDriverTest.java.
public class ClockDriverTest extends TestCase
public ClockDriverTest(String name)
public void testTimeChange()
MockTimeSource source = new MockTimeSource();
MockTimeSink sink = new MockTimeSink();
ClockDriver driver = new ClockDriver(source,sink);
Robert C. Martin is president of Object Mentor Inc., a firm that offers high-level, OO software design consulting, training, and development services. He is the author of Designing Object Oriented C++ Applications Using the Booch Method. He can be contacted at firstname.lastname@example.org.