### Question:
SharedKeyLiteAuthentication implements HttpRequestFilter { public HttpRequest filter(HttpRequest request) throws HttpException { request = this.isSAS ? filterSAS(request, this.credential) : filterKey(request); utils.logRequest(signatureLog, request, "<<"); return request; } @Inject  SharedKeyLiteAuthentication(SignatureWire signatureWire,
         @org.jclouds.location.Provider Supplier<Credentials> creds, @TimeStamp Provider<String> timeStampProvider,
         Crypto crypto, HttpUtils utils, @Named("sasAuth") boolean sasAuthentication); HttpRequest filter(HttpRequest request); HttpRequest filterSAS(HttpRequest request, String credential); HttpRequest filterKey(HttpRequest request); String[] cutUri(URI uri); String createStringToSign(HttpRequest request); String calculateSignature(String toSign); String signString(String toSign);  }### Answer:
@Test(threadPoolSize = 3, dataProvider = "dataProvider", timeOut = 3000) void testIdempotent(HttpRequest request) { request = filter.filter(request); String signature = request.getFirstHeaderOrNull(HttpHeaders.AUTHORIZATION); String date = request.getFirstHeaderOrNull(HttpHeaders.DATE); int iterations = 1; while (request.getFirstHeaderOrNull(HttpHeaders.DATE).equals(date)) { date = request.getFirstHeaderOrNull(HttpHeaders.DATE); iterations++; assertEquals(signature, request.getFirstHeaderOrNull(HttpHeaders.AUTHORIZATION)); request = filter.filter(request); } System.out.printf("%s: %d iterations before the timestamp updated %n", Thread.currentThread().getName(), iterations); }
@Test(dataProvider = "auth-sas-data") void testFilter(HttpRequest request, SharedKeyLiteAuthentication filter, String expected) { request = filter.filter(request); assertEquals(request.getEndpoint().toString(), expected); }