✅ Unit Testing HttpClient

private string myApiUrl = "https://www.some-api.com";
private IHttpClientFactory _httpClientFactory;
private Mock<HttpMessageHandler> _httpClientMock;

[SetUp]
public void SetUp()
{
  _httpClientMock = new Mock<HttpMessageHandler>();
  _httpClientMock.SetupRequest(HttpMethod.Post, $"{myApiUrl}/example").ReturnsResponse("Example response");

  var httpClientFactoryMock = new Mock<IHttpClientFactory>();
  httpClientFactoryMock.Setup(c => c.CreateClient("exampleApi")).Returns(new HttpClient(_httpClientMock.Object)
  {
      BaseAddress = new Uri(myApiUrl)
  });
  
  _httpClientFactory = httpClientFactoryMock.Object;
}

System.InvalidOperationException: Handler did not return a response message.