public static void TestPutIfMatchReturnsNullIfVerbNotPut()
        {
            // setup
            var request = new HttpRequestMessage(HttpMethod.Get, TestUrl);
            var entityTagHandler = new CachingHandler();
            var getRule = entityTagHandler.PutIfMatch();

            // run
            var task = getRule(request);

            // verify
            Assert.IsNull(task);
        }
        public static void PutIfMatchTest(
			string[] values,
			bool existsInStore,
			bool expectReturnNull,
			HttpStatusCode expectedStatus = HttpStatusCode.Unused)
        {
            // setup
            var mocks = new MockRepository();
            var entityTagStore = mocks.StrictMock<IEntityTagStore>();
            var entityTagHandler = new CachingHandler(entityTagStore);
            var request = new HttpRequestMessage(HttpMethod.Put, TestUrl);
            request.Headers.Add(HttpHeaderNames.IfMatch, values);
            TimedEntityTagHeaderValue entityTagHeaderValue = new TimedEntityTagHeaderValue("\"12345678\"");

            if (values.Length > 0) // if
                entityTagStore.Expect(x => x.TryGetValue(Arg<CacheKey>.Matches(etg => etg.ResourceUri == entityTagHandler.UriTrimmer(new Uri(TestUrl))),
                    out Arg<TimedEntityTagHeaderValue>.Out(entityTagHeaderValue).Dummy)).Return(existsInStore);

            mocks.ReplayAll();

            // run
            var matchNoneMatch = entityTagHandler.PutIfMatch();
            // verify
            Task<HttpResponseMessage> resultTask = matchNoneMatch(request);
            Assert.That(expectReturnNull ^ resultTask != null, "result was not as expected");
            if (resultTask != null && expectedStatus != HttpStatusCode.Unused)
            {
                Assert.AreEqual(expectedStatus, resultTask.Result.StatusCode, "Status code");
            }
            mocks.VerifyAll();
        }