SystemExtensions/SystemExtensions.Tests/Utils/MockHttpMessageHandler.cs

using System;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;

namespace SystemExtensionsTests.Utils;

public sealed class MockHttpMessageHandler : HttpMessageHandler
{
    public Func<HttpRequestMessage, HttpResponseMessage> ResponseResolver { get; set; }
    public Func<HttpRequestMessage, Task<HttpResponseMessage>> ResponseResolverAsync { get; set; }

    public MockHttpMessageHandler()
    {
    }

    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        if (this.ResponseResolver is object)
        {
            return Task.FromResult(this.ResponseResolver(request));
        }
        else
        {
            return this.ResponseResolverAsync(request);
        }
    }
}