如何模拟MediatR对Web API Controller执行xUnit测试

dotnet add package MediatR
dotnet add package xunit
dotnet add package Microsoft.AspNetCore.Mvc.Testing

public class MyControllerTests
{
    [Fact]
    public async Task MyController_GetData_ReturnsExpectedResult()
    {
        // 测试代码
    }
}

public async Task MyController_GetData_ReturnsExpectedResult()
{
    // 创建Mock的Mediator实例
    var mediatorMock = new Mock<IMediator>();

    // 设置Mediator的行为
    mediatorMock.Setup(m => m.Send(It.IsAny<GetDataQuery>(), default(CancellationToken)))
                .ReturnsAsync(new GetDataResponse { Data = "Test Data" });

    // 创建Controller实例，并将Mock的Mediator传递给它
    var controller = new MyController(mediatorMock.Object);

    // 调用Controller的方法
    var result = await controller.GetData();

    // 断言结果是否符合预期
    Assert.Equal("Test Data", result.Value);
}

public async Task MyController_GetData_ReturnsExpectedResult()
{
    // 创建WebApplicationFactory实例
    var factory = new WebApplicationFactory<Startup>();

    // 创建HttpClient
    var client = factory.CreateClient();

    // 调用API并获取响应
    var response = await client.GetAsync("/api/mycontroller");

    // 确保响应成功
    response.EnsureSuccessStatusCode();

    // 读取响应内容
    var content = await response.Content.ReadAsStringAsync();

    // 断言结果是否符合预期
    Assert.Equal("Test Data", content);
}