@Override
    public DocStringType docStringType() {
        return docStringType;
    }
@Test
    void can_define_doc_string_converter() throws NoSuchMethodException {
        Method method = JavaDocStringTypeDefinitionTest.class.getMethod("convert_doc_string_to_string", String.class);
        JavaDocStringTypeDefinition definition = new JavaDocStringTypeDefinition("text/plain", method, lookup);
        registry.defineDocStringType(definition.docStringType());
        assertThat(converter.convert(docString, Object.class), is("some_desired_string"));
    }