Run NUnit test fixture programmatically

I often want to perform a quick test, and code it up in LINQPad.

So I have a Main() entry point. Can I make NUnit "run" a fixture programmatically from there?

using NUnit.Framework;

public class Runner
{

  public static void Main()
  {
    //what do I do here?
  }

  [TestFixture]
  public class Foo
  {

    [Test]
    public void TestSomething()
    {
      // test something
    }

  }

}