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I'm new to Unit testing. I want to test React project. As I started with React documentation which refers to enzyme as test utility which is kind of ambiguous to me.
What is the difference between Jest and enzyme?
enzyme assertion library or task runner?karma with Jasmine?react-redux project?
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Jest is a test framework that has a runner and assertions. Enzyme is a test util library for manipulating and asserting React components, it works with Jest or Karma or Mocha or other test frameworks.
Many people choose to use Jest and Enzyme together to test their React web applications. They use Jest as a test runner and assertion library, then use Enzyme to build the tests for their UI. This results in slimmer, cleaner testing code that's also easier to debug when a test breaks.
Both Jest and Enzyme are specifically designed to test React applications, Jest can be used with any other Javascript app but Enzyme only works with React. Jest can be used without Enzyme to render components and test with snapshots, Enzyme simply adds additional functionality.
Jest is a framework which includes a task runner, assertion library, and mocking support. This means it can execute different unit test cases, write its result in console or log files, create mocks, or verify all the assertions. In short, it will execute the test.
Enzyme, on other hand, is a library that provides a simple interface for writing unit tests. For this purpose, it wraps packages such as React TestUtils, JSDOM and CheerIO. React TestUtils has methods to render a React component into a document and to simulate an event. JSDOM is a JavaScript implementation of the DOM (Document object model). The DOM represents the tree structure of UI components. CheerIO implements a subset of jQuery core and is used to query the DOM.
Enzyme is not a test runner. It doesn't have its own assertion library. It just provides a collection of APIs for unit testing. That's why it could be integrated with Jest or any other task runner.
Yes, you can use karma with jasmine.
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Aaron's comment answers your first question.
Enzyme provides unit testing utility functions for React components, such as allowing shallow rendering. The Enzyme docs say you can use it with any test runner or assertion library - see http://airbnb.io/enzyme/.
Yes, you can use karma with jasmine.
As far as the best way to test a react-redux project, that's a separate question and I suggest you search Stack Overflow. :)
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