How can I write output from a unit test?

Question

Any call in my unit tests to either Debug.Write(line) or Console.Write(Line) simply gets skipped over while debugging and the output is never print

Answer 1

I get no output when my Test/Test Settings/Default Processor Architecture setting and the assemblies that my test project references are not the same. Otherwise Trace.Writeline() works fine.

Answer 2

In Visual Studio 2017, you can see the output from test explorer.

1) In your test method, Console.WriteLine("something");

2) Run the test.

3) In Test Explorer window, click the Passed Test Method.

4) And click the "Output" link.

And click "Output", you can see the result of Console.Writeline().

Answer 3

It depends on your test runner... for instance, I'm using xUnit, so in case that's what you are using, follow these instructions:

https://xunit.github.io/docs/capturing-output.html

This method groups your output with each specific unit test.

using Xunit;
using Xunit.Abstractions;

public class MyTestClass
{
    private readonly ITestOutputHelper output;

    public MyTestClass(ITestOutputHelper output)
    {
        this.output = output;
    }

    [Fact]
    public void MyTest()
    {
        var temp = "my class!";
        output.WriteLine("This is output from {0}", temp);
    }
}

There's another method listed in the link I provided for writing to your Output window, but I prefer the previous.