Repozytorium Web Developera

Archiwum z lat 2013-2018, treści mogą być nieaktualne.

Testowanie JavaScript

Przydatne linki


Jest is testing platform. It has builtin features like test runner, test framework, assertion lib and mock lib. So in that way it is similar to Karma + Mocha + Chai + Sinon.


Karma is a test runner.


Mocha is testing framework. It provides methods like describe, it, etc.


Chai is an assertion library. There is also library chai-as-promised which enables possibility to test asynchronus code.


Sinon and Sinon-Chai is a library for mocking.


Enzyme is library which allows testing React components. It provides bindings for Chai and Jest.


Spies: Creates fake functions which we can use to track executions. This means we can tell/ find out whether the function has been executed/ how many times its been called etc. We can also use spies on existing functions and get the same capability, to track those functions executions. We'll see this in action a bit later.
Stubs: Enables us to replace functions. This gives us more control. We can return whatever we want or have our functions work in a way that suites us to be able to test multiple scenarios.
Mocks: They are fake methods, that have pre-programmed behavior and pre-programmed expectations.