@BeforeClass
	public static void init() {
		testdataDirectory = TestUtil.directoriesToFile("resources", "testdata");		
		if(!testdataDirectory.exists() || !testdataDirectory.isDirectory() || testdataDirectory.listFiles().length == 0) {
			throw new IllegalStateException("Test data directory \"" + testdataDirectory.getAbsolutePath() + " does not exist, is not a directory or is empty");
		}
	}