Node.js Test Frameworks
So far working on my own start-up has been interesting. Plans and approaches change as we learn more and talk to more people. Exactly what we’re building have also changed during the course of the last several months, but I’m happy to say that we’re closer to launch now. With this post I want to highlight the role of some test frameworks used with Node.js that got us here.
I believe that testing is essential in any environment, and I’m surprised there is still debate about it. Everybody thinks coding without source control is ridiculous. I think coding without consciously decide whether to test is equally ridiculous. It should be part of your arsenal to shipping code fast. Bring it out when it makes sense.
When I wrote the APIs that our mobile app calls, I made sure to seek out the testing frameworks available for Node.js. This is a core part of what the company would be based on, so it made sense. I first started with Vows.js and that worked fine for a while. However, I ran into issues when trying to cascade some of the tests. Aside from that issue though, I really liked the test framework.
Later at the suggestion of my co-founder Geoff Flarity, I checked out Mocha. It’s another test framework but I found Mocha works much better than Vows.js. Furthermore, it’s so cool to be able to pick out report style you want to use. I can nest my tests just fine unlike Vows.js. With Mocha, I also use Should.js to make assertions.
By trying to write tests for my code, it forced me to separate authentication from actual business logic. It also forced me to separate web server logic from core business logic. The separation of web server logic from business logic means that I’m able to reuse code in my command line scripts with no effort at all. It also means that testing anything is effortless. I’m able to set up the simulation environment by piecing together components without being tied up in a giant ball of mud. The separation of authentication from business logic is one that made even more impact.
During one of the founder meetings we’d hold at my co-founder Kaz Nejatian’s house, we made a strategic decision on what we’d build exactly. The decision made there meant that the way I was doing authentication from the mobile app needed to change. The Node.js APIs would also need changing. However, because I already have tests in place and already forced myself to separate authentication, making the switch wasn’t a big deal. Because the tests are in place I’m able to adapt to changes in the business faster and don’t waste time on getting things to work properly again.
I can already see how I will benefit even more from the componentized design arising from trying to write test. Based on feedback from talking to some VCs, we’re once again going to be tweaking the authentication piece a bit to test out a different business model. This would be in parallel with our old plan, but in the span of couple months tests have already proven to be useful. As we learn more about how to sell and what people want, I expect even more changes to come and we’ll need to react rapidly. I know the code is ready. Bring it on!