-code With Mosh- Mastering Javascript Unit Testing Online

"Thirty bucks."

Jest is currently the industry standard for JavaScript testing, used by giants like Facebook, Twitter, and Airbnb. The course dives deep into Jest, but it doesn't stop at the basics. -Code With Mosh- Mastering JavaScript Unit Testing

Leo turned to Sarah. "I broke the code on purpose. The tests found it in 0.3 seconds." "Thirty bucks

For the first time, Leo simulated a server crash on his laptop without breaking anything. He felt like a wizard. used by giants like Facebook

it('should complete the callback', (done) => function fetchData(callback) setTimeout(() => callback('peanut butter'), 1000);