[C#.NET] 單元測試的異常測試
除了正常的方法應該被測試到之外，程式裡的每一條分支也應該被測試到，這當然包含異常(Exception)，比如說我寫了一個方法
/// <summary>
/// 字串加密
/// </summary>
/// <param name="SourceString">原始字串</param>
/// <returns>返回 Base64 格式字串</returns>
public string EncryptStringToBase64String(string SourceString)
{
if (string.IsNullOrEmpty(SourceString))
throw new NotSupportedException("SourceString");
byte[] dataByteArray = this.EncryptStringToBytes(SourceString);
string encryptString = Convert.ToBase64String(dataByteArray);
return encryptString;
}
這裡有兩條分支，一條是正常的分支一條是例外的分支，正常的分支我們
正常的分支我這樣寫：
public void EncryptStringToBase64StringTest()
{
AbsEncryptCryptoServiceBase target = CreateAbsDesEncryptCryptoServiceBase();
string SourceString =
@"http://webhd.xuite.net/_oops/fgriasa/cn8
http://webhd.xuite.net/_oops/fgriasa/u4g
http://webhd.xuite.net/_oops/fgriasa/t64
http://webhd.xuite.net/_oops/fgriasa/o76
http://webhd.xuite.net/_oops/fgriasa/2c6
http://webhd.xuite.net/_oops/fgriasa/cqg
http://webhd.xuite.net/_oops/fgriasa/1dt
http://webhd.xuite.net/_oops/fgriasa/xaz
http://webhd.xuite.net/_oops/fgriasa/tkh
http://webhd.xuite.net/_oops/fgriasa/iqf
http://webhd.xuite.net/_oops/fgriasa/sye
http://webhd.xuite.net/_oops/fgriasa/8s4
http://webhd.xuite.net/_oops/fgriasa/zgi
解壓密碼
aiml.fgriasa.by.P2P101.FDZONE.ORG
在主場背水一戰的曼菲斯灰熊隊，面對快艇的第五戰，在第一節就以36-22取得大幅領先，不過快艇步步為營，在第三節最多曾經落後24分之後，逐步收復失土，第四節頗有重演第一戰大逆轉的味道。不過保羅(Chris Paul)此時手傷退場，快艇無力反擊，終場就以80-92敗下陣來，灰熊成功扳回一城，將系列賽延長到在洛杉磯的第六戰。
「我們已經陷入背水一戰的處境。」灰熊中鋒蓋索(Marc Gasol)表示：「我們現在還是如此，我們還沒有完成任何事情，而我們希望能夠打回洛杉磯，然後再打出一場偉大的戰役。」";
string expected = "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";
var encrypt = target.EncryptStringToBase64String(SourceString);
var base64Bytes = Convert.FromBase64String(encrypt);
var salt = saltDecode(base64Bytes);
var actual = Convert.ToBase64String(salt.ToArray());
Assert.AreEqual(expected, actual);
}
觀察一下涵蓋率，有一條例外的分支沒測到
別忘了，例外的分支也要測試，以確保結果如我們所期望，我們在測試方法裡定義 ExpectedException 類別，用它來補捉我們所期待的例外。
[ExpectedException(typeof(NotSupportedException))]
public void InvaildEncryptStringToBase64StringTest()
{
AbsEncryptCryptoServiceBase target = CreateAbsDesEncryptCryptoServiceBase();
string SourceString = "";
var encrypt = target.EncryptStringToBase64String(SourceString);
}
執行結果
測試涵蓋也覆蓋到 throw
若有謬誤，煩請告知，新手發帖請多包涵
Microsoft MVP Award 2010~2017 C# 第四季
Microsoft MVP Award 2018~2022 .NET
