### Question:
GsonMessageBodyWriter implements MessageBodyWriter<Object> { @Override public boolean isWriteable(Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) { return true; }  @Override boolean isWriteable(Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType); @Override long getSize(Object src, Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType); @Override void writeTo(Object src, Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> stringObjectMultivaluedMap, OutputStream outputStream); void setGson(Gson gson);  }### Answer:
@Test public void testIsWriteable() { assertTrue(provider.isWriteable(MockObject.class, MockObject.class.getGenericSuperclass(), new Annotation[]{}, MediaType.APPLICATION_JSON_TYPE)); }