How to create an NUnit test project that is also a self-running console app .exe

  1. Create your NUnit Test project as a Windows Console Application, not as a Class Library.
  2. Then make your main Program look like this:
    [TestFixture]
    public class Program
    {
        static void Main(string[] args)
        {
            NUnit.ConsoleRunner.Runner.Main(
                new[]{Assembly.GetExecutingAssembly().Location }
                );
        }
    
        [TestCase("Aa - Bb")]
        public void WhenValidatingForename_should_accept_valid_characters(string validInput)
        {
            var result= new ClassUnderTest().Validate(validInput);
            Assert.IsTrue(result);
        }
    
        [TestCase("X<")]
        public void WhenValidatingForename_should_reject_invalid_characters(string invalidInput)
        {
            var result= new ClassUnderTest().Validate(invalidInput);
            Assert.IsFalse(result);
        }
    }
  3. Then, add a reference not only to nunit.framework.dll but also to nunit-console-runner.dll

You now have a self-running executable that runs all your tests, but still behaves in the usual way in a build script, or when running tests inside Visual Studio with TestRunner or Resharper or similar.
NB You may need to check if your build scripts are hard-coded to expect a Test project to be a .dll.

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