Unit testing in Linqpad

linqpadtest.cs

public interface IRunner { void Execute(); }

// Add any unit tests by implementing IRunner and Linqpad will run it
public class UserTest_1 : IRunner
{
	public void Execute()
	{
		Debug.WriteLine("Beginning test");
		
		var x = 4 + 5;
		
		Debug.Assert(x == 9, "Test failed!");
	}
}

// Linqpad main method
void Main()
{
	var tests = typeof(UserQuery)
		.GetNestedTypes()
		.Where(type => typeof(IRunner)
		.IsAssignableFrom(type) && !type.IsInterface);
		
	foreach(var t in tests){
		(Activator.CreateInstance(t) as IRunner).Execute();
	}
}