@Test @Category(IntegrationTest.class) public void getThumbnail() { BoxAPIConnection api = new BoxAPIConnection(TestConfig.getAccessToken()); BoxFolder rootFolder = BoxFolder.getRootFolder(api); String fileName = "[getPreviewLink] Test File.txt"; String fileContent = "Test file"; byte[] fileBytes = fileContent.getBytes(StandardCharsets.UTF_8); InputStream uploadStream = new ByteArrayInputStream(fileBytes); BoxFile uploadedFile = rootFolder.uploadFile(uploadStream, fileName).getResource(); byte[] thumbnail = uploadedFile.getThumbnail(BoxFile.ThumbnailFileType.PNG, 256, 256, 256, 256); assertThat(thumbnail, is(notNullValue())); assertNotEquals(thumbnail.length, 0); uploadedFile.delete(); }