how-to-mock-httpcllient.cs

  Mock<HttpMessageHandler> handler = new Mock<HttpMessageHandler>();
            var factory = handler.CreateClientFactory(); // it comes from Moq.Contrib.HttpClient

            Mock.Get(factory).Setup(x => x.CreateClient("matrics"))
                .Returns(() =>
                {
                    var client = handler.CreateClient();
                    client.BaseAddress = new Uri("https://code4it.dev");
                    return client;
                });
                
                            handler.SetupAnyRequest().ReturnsResponse("validContent");