如何在单元测试中使用环境变量(.net核心)

<ItemGroup>
  <DotNetCliToolReference Include="Microsoft.Extensions.SecretManager.Tools" Version="2.0.0" />
</ItemGroup>

dotnet restore
dotnet tool install --global dotnet-user-secrets

dotnet user-secrets init
dotnet user-secrets set "MyKey" "MyValue"

private readonly IConfiguration _configuration;

public MyUnitTest()
{
    var configBuilder = new ConfigurationBuilder()
        .AddUserSecrets<MyUnitTest>();

    _configuration = configBuilder.Build();
}

[Fact]
public void MyUnitTest()
{
    var myValue = _configuration["MyKey"];

    // 进行断言和测试逻辑
    // ...
}