We've covered a lot of territory in this chapter, looking at three distinct areas of testing: unit testing, REST API testing, and UI functional tests. Ensuring that an application is well tested is an important step on the road to software success. A team that does not follow good testing practices is often bogged down with fixing regression after regression.
We've talked about the potential simplicity of simply using the assert module for testing. While the test frameworks, such as Mocha, provide great features, we can go a long way with a simple script.
There is a place for test frameworks, such as Mocha, if only to regularize our test cases, and to produce test results reports. We used Mocha and Chai for this, and these tools were quite successful. We even found a couple of bugs with a small test suite.
When starting down the unit testing road, one design consideration is mocking out dependencies. But it's not always a good use of our time to replace every dependency with a mock...