private ExecutableElement writeToParcelMethod(Context context) {
      for (ExecutableElement method : context.abstractMethods()) {
        if (method.getSimpleName().contentEquals("writeToParcel")) {
          return method;
        }
      }
      throw new AssertionError("Did not see abstract method writeToParcel");
    }
Tests that extensions providing their own implemented annotation types or options get picked
up.
value/src/test/java/com/google/auto/value/processor/ExtensionTest.java