Hi Martin I was asking myself these very same questions about a year ago. What really helped me get my head around unit testing was to read Misko Hevery's guide to testable code: http://bit.ly/GNymAe. While the examples are in Java, the same principles apply: embrace the Single Responsibility Principle (SRP), leverage Dependency Injection (DI), and isolate logic using Mock Objects.
I test-drove an example of a UserAuthenticator class using these ideas here: http://bit.ly/GNmDeQ. I tried to emulate your dependencies as much as possible (UserRepository class). It uses Jasmine for the unit tests. You can use jasmine-node (https://github.com/mhevery/jasmine-node) to run these locally. -Rehan On Friday, March 23, 2012 3:35:03 PM UTC-7, Martin Lundberg wrote: > > Hi! > > I'm having problems getting up and running with testing my node.js code. > > I've got a file called auth.js with a function that looks like: > authenticate(email, password, callback). The authenticate function tries to > fetch a user with the given e-mail using a collaborator UserRepository > object. It runs a function like: user = users.get({ email: email }, > function(user) { ... }) where users is the UserRepository object. If it > gets a user and the password is correct it calls the callback function > like: callback(null, user) but if it don't get a user or if the password is > incorrect it calls the callback sending an error as the first parameter. > > When writing unit tests the authenticate method (and all the other > functions in auth.js) I don't want to use the real UserRepository (which in > turn uses a database library like node-mysql) object and a real database. I > believe I should create a stub and define return values so I can see that > authenticate returns correct values when it gets a user and when it don't. > The problems is that I've read a lot of tutorials and articles about > mocking and testing but I still don't understand how I should do this in a > good way. > > I hope the text isn't too confusing. I would really appreciate some > guiding in this area so I can get started testing my apps in a good way. > > Regards, > > Martin Lundberg > > -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en
