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Previous: Mocking Next: Test Hooks - Part I

EasyMock

Here's an example of mocking in Java using EasyMock:

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import org.easymock.EasyMock;
import org.testng.annotations.Test;
interface DataLayer {
  void insertReminder(final Reminder reminder);
  Reminder getReminder(final String reminderID);
  void updateReminder(
    final String reminderID, final Reminder reminder);
  void deleteReminder(final String reminderID);
}
class Reminder {
  // Reminder fields go here
}
class Orchestrator {
  private final DataLayer dataLayer;
  public Orchestrator(final DataLayer dataLayer) {
    this.dataLayer = dataLayer;
  }
  public void addReminder(final Reminder reminder) {
    // Validation and pre-processing code goes here
    dataLayer.insertReminder(reminder);
    // ...
  }
}
public class OrchestratorTest {
  @Test
  public void testAddReminder() throws Exception {
    final Reminder reminderToAdd = new Reminder();
    final DataLayer dataLayerMock =
      EasyMock.createStrictMock(DataLayer.class);
    final Orchestrator orchestrator =
      new Orchestrator(dataLayerMock);
    dataLayerMock.insertReminder(reminderToAdd); // expect
    EasyMock.replay(dataLayerMock); // switch to replay state
    orchestrator.addReminder(reminderToAdd);
    // Assert the above mock conditions
    EasyMock.verify(dataLayerMock);
  }
}
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