使用 Moq 和 xUnit 进行单元测试失败 - InvalidOperationException

如何解决使用 Moq 和 xUnit 进行单元测试失败 - InvalidOperationException

我按照这篇文章使用 Moq 和 Xunit 设置了一个简单的集成测试：https://docs.microsoft.com/en-us/aspnet/core/mvc/controllers/testing?view=aspnetcore-3.1

运行测试时出现以下错误：

system.invalidOperationException : Can't load type x.IntegrationTests.Startup in 'x.IntegrationTests,Version=1.0.0.0,Culture=neutral,PublicKeyToken=null'

HomeControllerTests.cs

public class HomeControllerTests
    {
        [Fact]
        public void test()
        {
            Assert.True(true);
        }
    }

csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>

    <IsPackable>false</IsPackable>
  </PropertyGroup>

  <ItemGroup>
    <packagereference Include="Microsoft.AspNetCore.TestHost" Version="3.1.0" />
    <packagereference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
    <packagereference Include="Moq" Version="4.15.2" />
    <packagereference Include="xunit" Version="2.4.1" />
    <packagereference Include="xunit.runner.visualstudio" Version="2.4.3">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </packagereference>
    <packagereference Include="coverlet.collector" Version="1.3.0">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </packagereference>
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\x\x.csproj" />
  </ItemGroup>

  <ItemGroup>
    <None Update="xunit.runner.json">
      <copyToOutputDirectory>Always</copyToOutputDirectory>
    </None>
  </ItemGroup>

</Project>