using System;
using System.Collections.Generic;

using NUnit.Framework;

namespace MonoTests.Common
{
	delegate void AssertThrowsDelegate ();

	static class AssertExtensions
	{
		public static void Throws<ET> (AssertThrowsDelegate code, string message)
		{
			Throws (typeof (ET), code, message);
		}

		public static void Throws (Type exceptionType, AssertThrowsDelegate code, string message)
		{
			if (code == null)
				Assert.Fail ("No code provided for the test.");

			Exception exception = null;
			try {
				code ();
			} catch (Exception ex) {
				exception = ex;
			}

			if (exceptionType == null) {
				if (exception == null)
					Assert.Fail ("{0}{1}Expected: any exception thrown{1}But was: no exception thrown{1}",
						message, Environment.NewLine);
				return;
			}

			if (exception == null || exception.GetType () != exceptionType)
				Assert.Fail ("{0}{1}Expected: {2}{1}But was: {3}{1}",
				    message,
				    Environment.NewLine,
				    exceptionType,
				    exception == null ? "null" : exception.GetType ().ToString ());
		}

		public static void Throws (AssertThrowsDelegate code, string message)
		{
			Throws (null, code, message);
		}
	}
}