public void TestGetAllProviders()
        {
            var operationController = new OperationController(new ArmRepository(new MockHttpClientWrapper()))
            {
                Request = new HttpRequestMessage {
                    RequestUri = new Uri("https://localhost:44300/api/providers")
                },
                Configuration = new HttpConfiguration()
            };

            var response = operationController.GetAllProviders().Result;

            Assert.Equal(HttpStatusCode.OK, response.StatusCode);

            Assert.NotNull(response.Content);
            var objectContent = response.Content as ObjectContent;

            Assert.NotNull(objectContent);
            var providers = objectContent.Value as HashSet <string>;

            Assert.NotNull(providers);
            Assert.Equal(11, providers.Count);
        }