Jest Snapshot Testing: How to Write and Update Snapshots

Learn how to properly handle asynchronous JavaScript when writing tests in Jest! Start FREE Testing: https://accounts.lambdatest.com/register?utm_source=YouTube&utm_medium=Organic&utm_campaign=Dec23&utm_term=Nh7zZKq275M&utm_content=LT_Sign_Up 🎥In this 6th video of the Jest Tutorial Series, join 𝐌𝐚𝐫𝐜𝐨 𝐀 𝐂𝐫𝐮𝐳, founder of automateNow, as he explains snapshot testing in Jest and how it helps you catch unexpected UI changes while eliminating flaky tests. You’ll learn how Jest creates snapshot files, compares test output against stored references, and instantly highlights differences when something changes—making UI testing faster, more reliable, and easier to debug. In this video, Marco covers: ✔️ What snapshot testing is and how it works in Jest ✔️ Creating snapshot tests using toMatchSnapshot() ✔️ How Jest generates and stores snapshot files ✔️ Detecting UI and data changes automatically ✔️ Understanding snapshot test failures with diffs ✔️ Updating snapshots using --updateSnapshot / -u ✔️ Snapshot testing vs visual regression testing ✔️ Real-world UI component example with Jest By the end of this lesson, you’ll know exactly when and how to use snapshot testing in Jest, how to maintain snapshots confidently, and how to prevent flaky UI tests caused by unexpected changes. ⏱️ Video Chapters: 00:00 Introduction 0:40 What is snapshot testing? 1:13 How does it work? 2:20 Snapshot vs visual testing 3:00 UI component to be tested 4:00 Testing snapshots 14:32 Updating snapshots 17:14 Additional resources 18:08 Closing Missed watching the earlier videos? Introduction to Jest (Day 1): https://youtu.be/r4bLSl_j6yw Setting Up Jest (Day 2): https://youtu.be/bm_m0J8L0ko Write Your First Jest Test (Day 3):https://youtu.be/WiwH2VFR6-0 Understanding Jest Matchers (Day 4): https://www.youtube.com/watch?v=GrfiZNcK4nw Write Your First Jest Test (Day5):https://www.youtube.com/watch?v=EAaF1wMcMSw 📘 Learn More: https://www.testmuai.com/jest HOME: https://bit.ly/4uOCPKK BLOG: https://bit.ly/4nlq87I LINKEDIN: https://bit.ly/438HIm2 TWITTER: https://bit.ly/4eOI74s GITHUB: https://bit.ly/4ucseJI NEWSLETTER: https://bit.ly/4dI8Y0S CERTIFICATIONS: https://bit.ly/4tVdw9j