* <p>For testing fun, also includes a landmine method that EventBus tests are required not
 * to call ({@link #methodWithoutAnnotation(String)}).
 *
 * @author Cliff Biffle
 */
@NullUnmarked
public class StringCatcher {
  private final List<String> events = new ArrayList<>();

  @Subscribe
  public void hereHaveAString(@Nullable String string) {
    events.add(string);
  }

 * <p>For testing fun, also includes a landmine method that EventBus tests are required not
 * to call ({@link #methodWithoutAnnotation(String)}).
 *
 * @author Cliff Biffle
 */
@NullUnmarked
public class StringCatcher {
  private final List<String> events = new ArrayList<>();

  @Subscribe
  public void hereHaveAString(@Nullable String string) {
    events.add(string);
  }

  }

  public void testMissingSubscribe() {
    bus.register(new Object());
  }

  public void testUnregister() {
    StringCatcher catcher1 = new StringCatcher();
    StringCatcher catcher2 = new StringCatcher();
    assertThrows(IllegalArgumentException.class, () -> bus.unregister(catcher1));

    bus.register(catcher1);
    bus.post(EVENT);
    bus.register(catcher2);