using System.Collections.Generic;
using NUnit.Framework;

namespace TddPresentation
{
	[TestFixture]
	public class PasswordCheckerTest
	{
		private PasswordChecker _checker;

		private static IEnumerable<string> _badPasswords = new[]
		                                                   	{
		                                                   		"", " ", "1234567", "1234567"
		                                                   	};
		private static IEnumerable<string> GetBadPasswords()
		{
			return _badPasswords;
		}

		[SetUp]
		public void SetUp()
		{
			_checker = new PasswordChecker();
		}

		[Test]
		[TestCaseSource("GetBadPasswords")]
		//[TestCaseSource("_badPasswords")] // also shows black
		public void Returns_false_for_any_string_with_length_less_than_eight_characters(string password)
		{
			Assert.That(_checker.Check(password), Is.False);
		}
	}

	public class PasswordChecker
	{
		public bool Check(string password)
		{
			return IsNotNullEmptyOrWhiteSpace(password)
			       && HasLengthGreaterThanOrEqualToEight(password);
		}

		private static bool HasLengthGreaterThanOrEqualToEight(string password)
		{
			return password.Length >= 8;
		}

		private static bool IsNotNullEmptyOrWhiteSpace(string password)
		{
			return !string.IsNullOrWhiteSpace(password);
		}
	}
}