Use ITestOutputHelper with LambdaTale

[asbjornu]

In order to write output in tests with Xunit, test classes should take a dependence on ITestOutputHelper in their constructor and use its WriteLine() method within tests. With LambdaTale, I can't get this to work. Given the following class:

public class OutputScenarios
{
    private readonly ITestOutputHelper _testOutputHelper;

    public OutputScenarios(ITestOutputHelper testOutputHelper)
    {
        _testOutputHelper = testOutputHelper;
    }

    [Scenario]
    public void WriteToOutputScenario()
    {
        _testOutputHelper.WriteLine("Test");
    }
}

I get the following exception when executing the scenario:

System.InvalidOperationException: There is no currently active test.

What am I missing?

[asbjornu]

Seems like I just forgot to wrap the logging in an actual test. Rewriting it as such worked once I managed to get Rider to run the test from a fresh build and not a stale one:

public class OutputScenarios
{
    private readonly ITestOutputHelper _testOutputHelper;

    public OutputScenarios(ITestOutputHelper testOutputHelper)
    {
        _testOutputHelper = testOutputHelper;
    }

    [Scenario]
    public void WriteToOutputScenario()
    {
        "Write to the ITestOutputHelper".x(() =>
        {
            _testOutputHelper.WriteLine("Test");
        });
    }
}