In this concluding chapter, we've covered the basics of developing unit tests for a Node application. Unit testing is of course a large topic, but with this information you can take the steps required to improve your application quality.
Specifically we've covered:
Considerations for testing asynchronous code (what if the expected callback is never called?)
Using the assert module to implement quick test cases
The Vows test framework
Some questions about when to implement a mock object, and when not to do so
Creating a test database to hold test data
Separating the individual units to test in isolation from the rest of the application
Creating a mock data model, that can also be useful when prototyping the application
Testing route functions with all dependencies mocked out
Using test case failures to debug and improve the application
Making it easy to run the tests
For this to be a complete test suite, it has to do much more than what we've shown here, for example:
More tests for the Notes module...