dotnet test / dotnet vstest and console output on success. https://github.com/xunit/xunit/issues/1141

UnitTest1.cs

public class UnitTest1 
{ 
    public UnitTest1(ITestOutputHelper output) 
    { 
        var listener = new TestTraceListener(output); 
        Trace.Listeners.Add(listener); 
        _output = listener; 
    } 

    class TestTraceListener : TraceListener 
    { 
        ITestOutputHelper _output; 
        public TestTraceListener(ITestOutputHelper output) { _output = output; } 
        public override void Write(string message)  
        { 
            Console.WriteLine(message); // success message when you want show
            _output.WriteLine(message);  
        } 
        public override void WriteLine(string message)  
        { 
            Console.WriteLine(message); // success message when you want show
            _output.WriteLine(message);
        } 
    } 
    private readonly TestTraceListener _output;
    
    // Your Test
    [Theory("hoge")]
    public async ValueTask Test1(string actual)
    {
        _output.WriteLine("Any message you want to show on `dotnet test`");
        Assert.Equal("hoge", actual)
    }
}