SetupRequest only works when calling the Async methods on HttpClient.

[tubenator]

If I set up my code like this:

var handlerMock = new Mock<HttpMessageHandler>();
var httpClient = handlerMock.CreateClient();
httpClient.BaseAddress = new Uri("https://google.com/");

handlerMock
    .SetupAnyRequest()
    .ReturnsResponse(HttpStatusCode.OK, "", "text/plain");

Then this works fine:

await httpClient.SendAsync(new HttpRequestMessage(HttpMethod.Get, "stuff"));

This throws an exception.

httpClient.Send(new HttpRequestMessage(HttpMethod.Get, "stuff"));

The exception is
<System.InvalidOperationException: Handler did not return a response message.

This happens whether I use .SetupAnyRequest() or any .Setup method.