如何针对MS Test中的接口的两种不同实现运行一组单元测试？

Question

I have two services which both store data to disk and read it from there. One is using SQL, the other one is pure file based. Both implement my interface IDataStorage .

One layer above is a facade class that does processing to the data before passing it on to the IDataStorage implementation.

I have a set of unit tests for the facade class in Visual Studio 2012.

Problem is that there is currently a

#define USE_SQL_STORAGE

and

#define USE_FILE_STORAGE

in the first line of the test class that decides which concrete IDataStorage implementation gets passed to the facade class. I always test both implementations manually by changing the defined storage.

Is there a way to automate this and have both implementations tested against the same set of tests without having to maintain the same tests twice ?

Answer 1

Found it out myself.

The solution is to create an abstract base test class:

[TestClass]
public abstract class BaseTest
{
public abstract IDataStorage GetService();


[TestInitialize]
public virtual void Init()
{
this.service = GetService();
}
}

and then have two implementations of the bas class:

[TestClass]
public SQLiteTest : BaseTest
{
public override IDataStorage GetService()
{
return new SQLiteStorage();
}
}

[TestClass]
public FileTest : BaseTest
{
public override IDataStorage GetService()
{
return new FileStorage();
}
}

Then the two concrete implementations will show in the list of test cases but not the abstract base.