public async System.Threading.Tasks.Task TestIfCallToApiWillBe2001Async()
        {
            // Arrange.
            var responseData    = File.ReadAllText("Sample Data\\input.json");
            var messageResponse = FakeHttpMessageHandler.GetStringHttpResponseMessage(responseData);
            var options         = new HttpMessageOptions
            {
                HttpMethod          = HttpMethod.Get,
                RequestUri          = "https://www.rijksmuseum.nl/api/nl/collection?key=secret&format=json&type=schilderij&toppieces=True",
                HttpResponseMessage = messageResponse
            };
            var messageHandler = new FakeHttpMessageHandler(options);
            var service        = new ObjectNumberRepository(messageHandler);

            // Act.
            var results = (await service.ReadApiAsync("secret"));

            // Assert.
            options.NumberOfTimesCalled.ShouldBe(0);
            results.ShouldNotBeNull();
        }