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Tuesday, 27 September 2011

Unit test classes - using a base class

Posted on 11:11 by Unknown
Mai mult ca sigur cu toții am scris teste. 1,2, 3 .. n clase de teste. Într-un anumit moment ajungem sa dorim sa refactorizam codul, iar o parte din logica (setup-ul testelor) sa îl ducem în clasa de baza.
public class Test1: BaseTest
{
    [TestMethod]
    public void Method1Test()
    {
        Console.WriteLine("Method1Test");
    }

    [TestInitialize]
    public void TestInit()
    {
        Console.WriteLine("TestInitialize");
    }
   
    [TestCleanup]
    public void TestCleanup()
    {
        Console.WriteLine("TestCleanup");
    }
   
    [ClassInitialize]
    public static void ClassInit(TestContext testContext)
    {
        Console.WriteLine("ClassInit");
    }      
}
Sa ne uitam acuma la clasa de baza:
public class BaseTest{   
    [TestInitialize]
    public void BaseTestInit()
    {
        Console.WriteLine("BaseTestInitialize");
    }
   
    [TestCleanup]
    public void BaseTestCleanup()
    {
        Console.WriteLine("BaseTestCleanup");
    }
   
    [ClassInitialize]
    public static void BaseClassInit(TestContext testContext)
    {
        Console.WriteLine("BaseClassInit");
    }      
}
Totul pare in regula, in mod normal la rularea testului va asteptati sa ruleze in felul urmator:
  • BaseClassInit
  • ClassInit
  • BaseTestInit
  • TestInit
  • Method1Test
  • TestCleanup
Dar o sa avem parte de o surpriza:
  • ClassInit
  • BaseTestInit
  • TestInit
  • Method1Test
  • TestCleanup
BaseClassInit nu a fost apelat. Chiar dacă ne-am aștepta ca metoda din clasa de baza sa fie apelata, iar în alte framework-uri este suportat (NUnit) acest comportament, M$ nu ne prea ajuta în acest caz.
La aceasta problema eu am văzut 3 posibile soluții, de la caz la caz ele pot sa fie aplicate sau nu:
  1. clasa de teste care mosteneste clasa de baza sa apeleze explicit BaseClassInit. Dar acest lucru ne obliga avem o metoda decorata cu ClassInitialize in fiecare clasa derivata (poate nu ne dorim acest lucru);
  2. in unele situații, putem sa mutam logica din BaseClassInit în constructorul static:
static BaseTest()
{
    Console.WriteLine("BaseClassInit");
}
      3.  prin reflection putem sa facem un hook si sa ne implementam noi acest mecanism. Dar este destul de complex si nu cred ca merita;
Din fericire avem cateva solutii la indemana, dar uneori dupa o refactorizare ne putem trezi ca ne cad testele si sa nu gasim cauza exacta.
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