TestAverageMethod()

gistfile1.cs

void TestAverageMethod(Func<int, int, int> method)
{
    string methodName = method.Method.Name;

    List<string> failureText = new List<string>();
    int passCount = 0;
    int testCount = 0;

    Action<int, int, int> test = (a, b, expected) =>
        {
            testCount++;
            try
            {
                int actual = method(a, b);
                if (actual != expected)
                    failureText.Add(String.Format("{0}({1}, {2}) returns {3}, but should return {4}", methodName, a, b, actual, expected));
                else
                    passCount++;
            }
            catch (Exception ex)
            {
                failureText.Add(String.Format("{0}({1}, {2}) threw {3}", methodName, a, b, ex.GetType().FullName));
            }
        };

    Console.WriteLine("Results for {0}():", methodName);


    // low value tests
    passCount = 0;
    testCount = 0;

    for (int a = -5; a <= 5; a++)
    {
        for (int b = -5; b <= 5; b++)
        {
            int expected = (a + b) / 2;
            test(a, b, expected);
        }
    }

    Console.WriteLine("  Near Zero: {0} of {1} passed.", passCount, testCount);


    // end of range tests
    passCount = 0;
    testCount = 0;

    test(Int32.MaxValue, Int32.MaxValue, Int32.MaxValue);
    test(Int32.MinValue, Int32.MinValue, Int32.MinValue);
    test(Int32.MaxValue, Int32.MaxValue - 2, Int32.MaxValue - 1);

    Console.WriteLine("  End of Range: {0} of {1} passed.", passCount, testCount);

        
    // write out any failures
    if (failureText.Count > 0)
    {
        Console.WriteLine("  Failed Values:");
        foreach (string text in failureText)
            Console.WriteLine("  - {0}", text);
    }
}