xunit输出

//输出，只能注入

public class MyUnitTest
    {
        private IServiceCollection service;
        private readonly ITestOutputHelper output;
        public MyUnitTest(ITestOutputHelper tempOutput)
        {
            output = tempOutput;// new TestOutputHelper();
            service = new ServiceCollection();
            service.AddmyMiddleware();
            service.BuildServiceProvider();

        }
        [Fact]
        public void test()
        {

        }

        [Fact]
        public void WritLine()
        {
            output.WriteLine("hi");
        }
    }