MsTest - executing method before each test in an a

问题:

Is it possible to run specific method before each test in an assembly?

I know about TestInitialize attribute but this attribute has "class scope". If it's defined in a Test class it will be executed before each test from this class.

I want to define a method that will be executed before each test defined in a whole assembly.

回答1:

I am not sure that this feature is possible in MsTest out of box like in other test frameworks (e.g. MbUnit).

If I have to use MsTest, then I am solving this by defining abstract class TestBase with [TestInitialize] attribute and every test which needs this behaviour derives from this base class. In your case, every test class in your assembly must inherit from this base...

And there is probably another solution, you can make your custom test attribute - but I have not tried this yet... :)

回答2:

[TestInitialize()] is what you need.

private string dir;

[TestInitialize()]
public void Startup()
{
    dir = Path.GetTempFileName();
    MakeDirectory(ssDir);
}

[TestCleanup()]
public void Cleanup()
{
    ss = null;
    Directory.SetCurrentDirectory(Path.GetTempPath());

    setAttributesNormal(new DirectoryInfo(ssDir));
    Directory.Delete(ssDir, true);
}


[TestMethod]
public void TestAddFile()
{
    File.WriteAllText(dir + "a", "This is a file");
    ss.AddFile("a");
    ...
}

[TestMethod]
public void TestAddFolder()
{
    ss.CreateFolder("a/");
    ...
}

This gives a new random temporary path for each test, and deletes it when it's done. You can verify this by running it in debug and looking at the dir variable for each test case.

回答3:

You want to use [AssemblyInitialize].

See: MSDN Link

or this question: on stackoverflow

回答4:

Well isn't MSTest instantiating the class for each test? That was my understanding of it. In such a case whatever you call from your constructor is the initialization code (per test by definition).

EDIT: If it doesn't work (which I still think it should because MSTest needs to make sure that individual test method runs are isolated) then TestInitialize is your attribute. By the way the best unit-test comparison is available at Link on Codeplex

回答5:

I think you are looking for the ClassInitialize attribute.