public List<File> getReportDataFiles(long testId, String key) {
		File reportFolder = config.getHome().getPerfTestReportDirectory(String.valueOf(testId));
		FileFilter fileFilter = new WildcardFileFilter(key + "*.data");
		File[] files = reportFolder.listFiles(fileFilter);
		return Arrays.stream(requireNonNull(files))
			.sorted(Comparator.comparing(o -> FilenameUtils.getBaseName(o.getName())))
			.collect(toList());
	}
Get files respectively if there are multiple tests.

@param testId test id
@param key    report key
@return return file list
ngrinder-controller/src/main/java/org/ngrinder/perftest/service/PerfTestService.java