How to Fix 'Field is Not Writable' Error (Easily)

🌟 Hello Salesforce Developers! Welcome back to our channel, where we simplify Salesforce development for you. I'm Simon, a Salesforce Developer at Smoothstack, and today, I'm excited to share a common yet critical challenge in Apex testing - handling the 'Field is not writable' error.
🔍 What You'll Learn:
Understanding the 'Field is not writable' error in Apex testing
Step-by-step guide to mocking read-only fields
Crafting effective Apex test classes
Enhancing your testing strategies in Salesforce
👨‍💻 Who am I?
I'm Simon, a seasoned Salesforce Developer passionate about sharing my knowledge and helping fellow developers overcome complex challenges in Salesforce.
🛠️ Tutorial Outline:
Decoding the 'Field is not writable' error
Why mocking read-only fields is essential in Apex tests
The Power of JSON: A Solution to Mock Read-Only Fields
Practical demonstration and tips for efficient testing
🚀 By the end of this tutorial, you'll be equipped with the skills to mock read-only fields in your Apex test classes confidently, ensuring robust and error-free testing.
💬 If you find this tutorial helpful, please like, share, and subscribe for more Salesforce development insights from me. Don't forget to hit the notification bell for our latest updates. Have questions or need more clarification? Drop a comment below, and I'll be happy to assist. Happy coding, Salesforce enthusiasts!
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[@TimPaduraru]

I think they changed the JSON.deserialize function since then. the new sytanx for API 60:
Case mockCase = (Case)JSON.deserialize('{....}', Case.class);

[@KseniyaTsimashenka]

I've got this error: "Variable does not exist: TestRecordUtility"