Set Up the Test Framework
Let’s add some tests to the word counter project. We’ll start by installing a test framework that runs our tests and reports the test results. We’ll use Jest[15] because it offers an excellent out-of-the-box experience, but you can apply the techniques you’ll learn to other test frameworks.
Navigate to the word counter project directory and install Jest as a development dependency:
| | $ npm i --save-dev jest |
Since your code uses JSX, you also need to transpile the code when you run the tests. A Jest plugin called babel-jest ensures Jest transpiles the test code with the Babel configuration it finds in the package root. Install the babel-jest plugin as a development dependency:
| | $ npm i --save-dev ... |
Get React for Real now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
