@Subscribe
  public void hereHaveAString(String string) {
    events.add(string);
  }
A simple EventHandler mock that records Strings.

For testing fun, also includes a landmine method that Bus tests are
required <em>not</em> to call ({@link #methodWithoutAnnotation(String)}).

@author Cliff Biffle
otto/src/test/java/com/squareup/otto/StringCatcher.java