private static void checkTestingDirs() { assertThat(BASE_TESTING_DIR).exists().isDirectory(); assertThat(INPUT_DIR).exists().isDirectory(); assertThat(BATCH_RESIZE_OUTPUT_DIR).exists().isDirectory(); assertThat(BATCH_FILTER_OUTPUT_DIR).exists().isDirectory(); assertThat(Files.fileNamesIn(BATCH_RESIZE_OUTPUT_DIR.getPath(), false)).isEmpty(); assertThat(Files.fileNamesIn(BATCH_FILTER_OUTPUT_DIR.getPath(), false)).isEmpty(); }