Yes, I believe it is and I think it is dangerous, and confusing to people new to the concepts of testing. I've mentioned a point similar to this on here before, but with the announcement of Rails "integration" test, I'm worried that somebody somewhere is getting their types of tests worryingly mixed up. Lets start with what we had in the beginning...unit tests (for models) and "functional" tests (for controllers). This was wrong from the start, because Rails' idea of functional tests were in fact just UNIT tests for controllers (or specifically, single actions in a controller). A unit test being, a test that tests a small unit functionality at the code level - it makes sure that that unit of code does what it is supposed to do. In a Rails app, a unit might be a single Model or it might be a single action on a controller. So what is functional testing? Functional testing is another name for ACCEPTANCE testing. What is ACCEPTANCE testing? I will quote from this article: http://www-128.ibm.com/developerworks/java/library... Acceptance testing, also known as black-box and functional testing, is a way > of testing and verifying that an application works according to functional, > non-functional, and other important stakeholder requirements. Acceptance > tests complement unit and integration tests, which are usually written using > xUnit frameworks. Acceptance tests can also be written using a programming > language, but Selenium and similar tools like Fitnesse also support tests > written using a tool-specific document format. > Further more, there are some important rules regarding acceptance tests: > > The key point here is that acceptance tests make sure that the system works end-to-end and complies with its core requirements. In Extreme Programming terms, this is often a "user story". A user story is considered complete when all acceptance tests pass. Unlike unit tests, which should ideally be running with a 100% pass rate, acceptance tests start at 0% and finish at 100% when the story is fully implemented. From the extremeprogramming.org website: Acceptance tests are black box system tests. Each acceptance test represents > some expected result from the system. Customers are responsible for > verifying the correctness of the acceptance tests and reviewing test scores > to decide which failed tests are of highest priority. Acceptance tests are > also used as regression tests prior to a production release. > A user story is not considered complete until it has passed its acceptance > tests. This means that new acceptance tests must be created each iteration > or the development team will report zero progress. > So now, we have the announcement of Integration Tests for Rails. Integrations should be tests to ensure that multiple units work together correctly. But Rails integration tests look just like acceptance/functional tests though (much like FIT or Selenium in driven mode)! How confusing for the testing newbie! The reason I bring this up is because I really believe the Rails developers should look at clarifying and renaming their tests to get the semantics correct. How can you expect testing newbies to start testing their apps when the framework they are using can't even get the names of their tests correct? So what do I propose: - Rails' existing "functional" tests should be correctly referred to as unit tests, which is all they are. For organisational purposes I can see the advantage of breaking up your model and controller unit tests as the unit testing strategy for these two different types of object are usually different. - Rails' new "integration" tests are renamed to functional or acceptance tests, which is what they really are. They should be seen as a built-in alternative to using a browser-based acceptance testing tool like Watir or Selenium. In fact, Rails' new built-in Integration tests could be compared to something like Selenium in "driven" mode instead of test-runner mode. Personally, I feel that for web apps Selenium in test-runner mode is more appropriate, but thats just my preference. - Integration tests are left to the user to put together if they feel they need to use them. Their typical usage would be if there are several models that need to work together to produce results. To support the above the tests folder would probably look something like this: unit/models unit/controllers acceptance/ integration/ fixtures/ I'd like to hear people's thoughts on the above.
on 2006-03-05 21:05
on 2006-03-05 22:40
Luke R. wrote: > The reason I bring this up is because I really believe the Rails > developers > should look at clarifying and renaming their tests to get the semantics > correct. How can you expect testing newbies to start testing their apps > when > the framework they are using can't even get the names of their tests > correct? So what do I propose: > > - Rails' existing "functional" tests should be correctly referred to > as unit tests, which is all they are. For organisational purposes I > can see > the advantage of breaking up your model and controller unit tests as > the > unit testing strategy for these two different types of object are > usually > different. > - Rails' new "integration" tests are renamed to functional or > acceptance tests, which is what they really are. They should be seen > as a > built-in alternative to using a browser-based acceptance testing tool > like > Watir or Selenium. In fact, Rails' new built-in Integration tests > could be > compared to something like Selenium in "driven" mode instead of > test-runner > mode. Personally, I feel that for web apps Selenium in test-runner > mode is > more appropriate, but thats just my preference. > - Integration tests are left to the user to put together if they feel > they need to use them. Their typical usage would be if there are > several > models that need to work together to produce results. > > To support the above the tests folder would probably look something like > this: > > unit/models > unit/controllers > acceptance/ > integration/ > fixtures/ > > I'd like to hear people's thoughts on the above. Hi, As for your suggestion to stop referring to controller unit tests as "functional" tests I couldn't agree more. However, renaming the new integration tests to "acceptance" would not be a good idea as far as I'm concerned. As you wrote, acceptance tests complement unit and integration tests - they check if stakekolder requirements are met. Unit test check how components work in isolation, integration tests check cooperation between components. So I suppose even if "integration" might not be the best word it seems better than "acceptance", since what the new tests actually bring in is the ability to test cooperation between controllers. The fact that this makes it possible to test scenarios does not make it "acceptance tests" I guess :) -- Agnieszka F.
on 2006-03-08 06:06
I agree with what you said, Luke, although I don't yet have a good understanding of Watir and Selenium, which I've been meaning to check out. I don't mean to hijack this thread, but I have to share this as an example of what Luke was touching upon. Speaking of testing vocabulary; today at work our group of developers were overruled as unit testing is now to be known as developer testing in our organization. We watched in amazement as management declared unit testing to mean non-automated scripted testing, otherwise known as functional testing. Talk about going against standard industry concepts! Peter