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)
        .isNotNull();

  final <T> T isSubtype(T sub) {
    Type returnType = method.getGenericReturnType();
    Type paramType = getOnlyParameterType();
    TestSubtype spec = method.getAnnotation(TestSubtype.class);
    assertWithMessage("%s is subtype of %s", paramType, returnType)
        .that(TypeToken.of(paramType).isSubtypeOf(returnType))
        .isTrue();

  final <T> T isSubtype(T sub) {
    Type returnType = method.getGenericReturnType();
    Type paramType = getOnlyParameterType();
    TestSubtype spec = method.getAnnotation(TestSubtype.class);
    assertWithMessage("%s is subtype of %s", paramType, returnType)
        .that(TypeToken.of(paramType).isSubtypeOf(returnType))
        .isTrue();

        if (methodName.equals("getAnnotatedBounds")
            || methodName.equals("isAnnotationPresent")
            // Each of these prefixes is shared by a family of methods:
            || methodName.startsWith("getAnnotation")
            || methodName.startsWith("getDeclaredAnnotation")) {
          throw new UnsupportedOperationException(
              "Annotation methods are not supported on synthetic TypeVariables created during type"

        if (methodName.equals("getAnnotatedBounds")
            || methodName.equals("isAnnotationPresent")
            // Each of these prefixes is shared by a family of methods:
            || methodName.startsWith("getAnnotation")
            || methodName.startsWith("getDeclaredAnnotation")) {
          throw new UnsupportedOperationException(
              "Annotation methods are not supported on synthetic TypeVariables created during type"

    protected void extractAnnotations(final PDDocument doc, final StringWriter writer) {
        for (final PDPage page : doc.getPages()) {
            try {
                for (final PDAnnotation annotation : page.getAnnotations()) {
                    if (annotation instanceof final PDAnnotationFileAttachment annotationFileAttachment) {
                        final PDFileSpecification fileSpec = annotationFileAttachment.getFile();