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Unit test classes - using a base class

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.

Comments

  1. Mi se pare normal ceea ce se întîmplă acolo. În momentul în care iterezi cu reflection prin clasa derivată o să vezi (în mod natural) doar metodele clasei derivate. Nu e M$ de vină, lucrurile sunt la fel implementate și în Java.

    ReplyDelete
  2. http://www.nunit.org/index.php?p=fixtureSetup&r=2.5.7
    La NUnit, nu este nevoie ca metoda sa fie statica, din aceasta cauza problema se rezolva destul de simplu.

    ReplyDelete

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