Mastering React Test-Driven Development

Best practices for your unit tests

Great unit tests are:

• Independent: Each test should test just one thing, and invoke only one unit. There are many techniques that we can employ to achieve this goal. To take just two examples: collaborators are often (but not always) mocked, and example data should be the minimum set of data required to correctly describe the test.

You may have heard of the 'great TDD debate' of classicist vs mockist TDD, sometimes called Detroit school and London school. The idea is that the classicist will not use mocks and stubs, and the mockist will mock all collaborators. I think this is a false dichotomy. Both techniques are important, and you have seen both in use in this book. I would encourage you to not limit ...