Lately, my team has been looking for better ways to create and maintain mocks in our TypeScript project. In particular, we wanted an easy way to mock out modules that we built using Sinon.JS.
Lately, I’ve been using Sinon.JS for mocking in my unit tests. By using mocks for dependencies inside functions, I can write unit tests that are resilient to a changing codebase. Functions with mocks can also be developed without worrying about the chain of dependencies that could affect the logic inside the functions.
When using Node.js, you should never mix promises and callbacks. It’s a recipe for confusion. The problem is pretty obvious in hindsight, but it sure threw me for a loop the first time I ran into it.
Having fast tests is important. Slow running tests slow down development, especially if you’re practicing TDD. If tests are too slow to run, some developers may avoid running them altogether. Slow tests will also slow down CI builds, increasing the length of your feedback loop. While it takes more development time, doing maintenance on your […]