I thought some more about the syntax of my Rhino Mock DSL. It can feel unnatural putting all the mock expectation code before the call to the object being tested. I came up with this working prototype instead:

[Test]
def Get_data_objects_for_nonexistent_company_throws():
    with_mocks:
        database = mocks.CreateMock[of IDatabase]()
        userProvider = StubUserProvider("andrew", "bad corp")
        userProvider.MakeCurrent()

        execute:
            uds = UserDataService(database, userProvider)
            expect_throw FaultException[of GetDataObjectsFault]:
                uds.GetDataObjects()
            assert thrown_exception.Detail.Type.Equals(GetDataObjectsFaultType.InvalidCompany)

        assuming:
            database.GetUserID("andrew", "bad corp")
            returned 1
        assuming:
            database.GetCompanyID("bad corp")
            returned 0 # returning 0 from database implies nonexistent company.

The with_mocks method sets up the mock repository and a Store object. The execute and assumption methods then put their blocks into the Store. At the end of with_mocks I iterate through assumptions calling each to set up the Rhino Mock expectations. Following that is: mocks.ReplayAll(), call to the "execute" block, then mocks.VerifyAll().

The other clever bit in there is the expect_throw method. This runs the block inside a try...except and fails if no exception (or wrong exception type) is thrown. It puts the exception object into field that is readable using thrown_exception. This means we can then test assertions about the exception contents. I had to cheat a bit and declare thrown_exception as "duck" in Boo i.e. it is late bound. This is so we can access members on the actual object despite not really knowing about it at compile time.

I like the readability now. The outline is:

• Initialize mocks and data objects
• Call the object being tested
• Assert about the result
• State the assumptions about how dependencies are used

The key bit, I feel, is that the call to the object being tested is not buried down at the bottom of the method.

How does everyone else feel about this modified approach?

Wednesday, July 04, 2007 10:41:55 AM (GMT Standard Time, UTC+00:00)      Comments [0]  .net | boo | dsl | mock_objects | programming | rhino_mocksTracked by:
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