如何在TypeMoq中返回HTTP错误响应

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

public class MyHttpClientTests
{
    [Fact]
    public async Task TestHttpClientError()
    {
        // 创建一个Mock对象
        var httpClientMock = new Mock<HttpClient>();

        // 设置模拟对象的行为，返回HTTP错误响应
        httpClientMock
            .Setup(x => x.SendAsync(
                It.IsAny<HttpRequestMessage>(),
                It.IsAny<CancellationToken>()))
            .ReturnsAsync(new HttpResponseMessage
            {
                StatusCode = HttpStatusCode.BadRequest,
                Content = new StringContent("Bad Request")
            });

        // 使用模拟对象进行测试
        var myHttpClient = new MyHttpClient(httpClientMock.Object);
        var response = await myHttpClient.SendRequestAsync();

        // 验证返回的HTTP错误响应
        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
        Assert.Equal("Bad Request", await response.Content.ReadAsStringAsync());
    }
}

public class MyHttpClient
{
    private readonly HttpClient _httpClient;

    public MyHttpClient(HttpClient httpClient)
    {
        _httpClient = httpClient;
    }

    public async Task<HttpResponseMessage> SendRequestAsync()
    {
        // 发送HTTP请求
        var request = new HttpRequestMessage(HttpMethod.Get, "https://example.com");
        var response = await _httpClient.SendAsync(request);

        return response;
    }
}