### Question:
ImageControllerUtils { public byte[] getDefaultImage() { return imageService.getDefaultImage(); } ImageControllerUtils(ImageService imageService, JSONUtils jsonUtils); ResponseEntity<String> prepareResponse(
            MultipartFile file,
            HttpHeaders responseHeaders,
            Map<String, String> responseContent); String getResponceJSONString(Map<String, String> responseContent); void prepareResponse(byte[] bytes,
                                HttpServletResponse response,
                                Map<String, String> responseContent); void prepareNormalResponse(byte[] bytes, Map<String, String> responseContent); String convertImageToIcoInString64(byte[] imageBytes); byte[] getDefaultImage(); ImageService getImageService(); static final String STATUS; static final String SRC_PREFIX; static final String SRC_IMAGE; }### Answer:
@Test public void getDefaultImageShouldReturnDefaultImageOfImageService() { when(imageService.getDefaultImage()).thenReturn(validAvatar); byte[] image = imageControllerUtils.getDefaultImage(); assertEquals(validAvatar, image); }