assertWithMessage(
            rootLocaleFormat("%s must be annotated with @TesterAnnotation.", annotationClass))
        .that(annotationClass.getAnnotation(TesterAnnotation.class))
        .isNotNull();
    Retention retentionPolicy = annotationClass.getAnnotation(Retention.class);
    assertWithMessage(rootLocaleFormat("%s must have a @Retention annotation.", annotationClass))
        .that(retentionPolicy)

    for (int i = 0; i < 11; i++) {
      assertEquals(rootLocaleFormat(format, i), factory.newThread(monitoredRunnable).getName());
    }
  }

  public void testNameFormatWithPercentD_custom() {
    String format = "super-duper-thread-%d";
    ThreadFactory factory = builder.setNameFormat(format).build();
    for (int i = 0; i < 11; i++) {
      assertEquals(rootLocaleFormat(format, i), factory.newThread(monitoredRunnable).getName());

    for (int i = 0; i < 11; i++) {
      assertEquals(rootLocaleFormat(format, i), factory.newThread(monitoredRunnable).getName());
    }
  }

  public void testNameFormatWithPercentD_custom() {
    String format = "super-duper-thread-%d";
    ThreadFactory factory = builder.setNameFormat(format).build();
    for (int i = 0; i < 11; i++) {
      assertEquals(rootLocaleFormat(format, i), factory.newThread(monitoredRunnable).getName());