public static Set<String> getFilesDigest(File baseDir, List<File> files) {
		return files
			.stream()
			.map(file -> getFileDigest(baseDir, file))
			.collect(toSet());
	}
Make file digest to {relative path from base directory}:{md5 checksum of file} format.

@param baseDir  Base directory for calculate relative path.
@param file     Target file.
ngrinder-core/src/main/java/net/grinder/util/FileUtils.java