How to log to Visual Studio IDE output window

[suntong]

Just a simple noob question,

How to log to Visual Studio IDE output window?

I have a NUnit test, and I want to log some info to Visual Studio IDE output window during test execution. I've traced NUnit's own logging (to Visual Studio IDE output) to this project, but I can't make it works myself. E.g., I tried, among many other things,

Microsoft.VisualStudio.TestTools.UnitTesting.Logging.Logger.LogMessage("My own IDE output window log message");

but none is working for me.

Or, what IMessageLogger I should use (that is for Visual Studio IDE output), when initializing my own logger like the following?

https://github.com/nunit/nunit3-vs-adapter/blob/d8943d87ecccc097224494f905df287d79f097b3/src/NUnitTestAdapter/NUnitTestAdapter.cs#L121

Please help. Thanks!

[pvlakshm]

Not sure I understand ...
If you use Console.Writeline you should see the emitted text in the Visual Studio Test Explorer's Output link.

Or, you can use a TextWriter ...

    System.IO.TextWriter t = TestContext.Out;
    t.WriteLine("using TextWriter");

Here too you should see the emitted text in the Visual Studio Test Explorer's Output link.

[suntong]

First, I want to log some info to Visual Studio IDE output window, check this out:

Second, I want to log them during test execution, not debugging.

NUnit's own logging is able to do it, logging to Visual Studio IDE output, but I'm not clear how. Hence the questions in OP.

This is during NUnit's unit test, where there is no console to write to. Console.WriteLine() does not write to Visual Studio IDE's output window. I just double-checked it.

Neither is the TextWriter, I just tried the above sample code but it is not logging to Visual Studio IDE output either:

Thx.

[acesiddhu]

@suntong there is only one way today (and we don't want any other message to flow in test output window because it will have too many messages in the window which will confuse users
The only way (and I suggest we use that only for debugging) is Console.Error.WriteLine("test");

Normal Console.WriteLine("") messages wont flow to test window output. but they will flow to output of test case

[suntong]

That looks like a normal Unit test instead of a NUnit test, which is easy to write to (using Debug.WriteLine) because of that "Output" link. A NUnit test doesn't have that:

That's why I need to write to the Visual Studio IDE output window as posted above:

[acesiddhu]

it is a nunit test

using NUnit.Framework;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace nunit
{
public class Class1
{
[Test]
public void Test1()
{
// Console.Error.WriteLine("test"); // this prints in output window
Console.WriteLine("test"); // this shows in test window output as image attached in my previous reply
}
}
}

[suntong]

Gotya! Thanks a lot for helping!!!