你是如何扩展你的Assert类的

Question

我喜欢扩展我的Assert.AreEqual到许多不同的类,当然已知的是CollectionAssert,但我可以想到更多如:ImageAssert,XmlAssert等.

您是否创建了自己的Assert类？你想创造什么样的新品？

Answer 1

这是我的解决方案：

using MyStuff;

using A = Microsoft.VisualStudio.TestTools.UnitTesting.Assert;

namespace Mytestproj.Tests
{
    public static class Assert
    {
        public static void AreEqual(object expected, object actual)
        {
            A.AreEqual(expected, actual);
        }

        // my extension
        public static void AreEqual(MyEnum expected, int actual)
        {
            A.AreEqual((int)expected, actual);
        }

        public static void IsTrue(bool o)
        {
            A.IsTrue(o);
        }

        public static void IsFalse(bool o)
        {
            A.IsFalse(o);
        }

        public static void AreNotEqual(object notExpected, object actual)
        {
            A.AreNotEqual(notExpected, actual);
        }

        public static void IsNotNull(object o)
        {
            A.IsNotNull(o);
        }

        public static void IsNull(object o)
        {
            A.IsNull(o);
        }
    }
}

Answer 2

正如我上面所写的（在我的问题中） ，我刚刚向ImageAssert添加了一个实现，我很高兴听到更多此类示例

[TestMethod]
public void CompareImagesSize()
{
 Image expected = Bitmap.FromFile(@"C:\ShaniData\Projects2008\TddSamples\Output\ExpectedImage.png");
 Image actual = Bitmap.FromFile(@"C:\ShaniData\Projects2008\TddSamples\Output\RhinoDiagram.png");

 Bitmap expectedBitmap = new Bitmap(expected);
 Bitmap actualBitmap = new Bitmap(actual);

 ImageAssert.HasTheSameSize(expectedBitmap, actualBitmap);
}

[TestMethod]
public void CompareTwoSameImagesButWithDifferenExtension()
{
 Image expected = Bitmap.FromFile(@"C:\ShaniData\Projects2008\TddSamples\Output\Image2.png");
 Image actual = Bitmap.FromFile(@"C:\ShaniData\Projects2008\TddSamples\Output\Image1.jpg");

 Bitmap expectedBitmap = new Bitmap(expected);
 Bitmap actualBitmap = new Bitmap(actual);

 ImageAssert.AreEqual(expectedBitmap, actualBitmap);
}

public class ImageAssert
{
    //public static void MoreMethods(Bitmap expected, Bitmap actual)
    //{
    //    //Compare image extensions
    //    //Compare Thumbnail...
    //}

    public static void HasTheSameSize(Bitmap expected, Bitmap actual)
    {
        if ((expected.Height != actual.Height)
            || (expected.Width != actual.Width))
            HandleFail("ImageAssert.HasTheSameSize", String.Empty);
    }

    public static void AreEqual(Bitmap expected, Bitmap actual)
    {
        for (int i = 0; i < expected.Width; i++)
        {
            for (int j = 0; j < expected.Height; j++)
            {
                Color expectedBit = expected.GetPixel(i, j);
                Color actualBit = actual.GetPixel(i, j);
                if (!expectedBit.Equals(actualBit))
                {
                    HandleFail("ImageAssert.AreEqual", String.Empty, i, j);
                    return;
                }
            }
        }
    }

    internal static void HandleFail(string assertionName, string message, params object[] parameters)
    {
        throw new AssertFailedException(String.Format(assertionName));
    }
}