You often come across the requirement to add a button in the list view for some objects ( In this example, I am talking about the Account list view). Guided Practice (We-do): To add a button in the list view, perform the steps below: Navigate to Setup | Object Manager
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IsTest Annotation in Salesforce
Use the isTest annotation to define classes or individual methods that only contain code used for testing your application. The isTest annotation is similar to creating methods declared as test Method. Note:– Classes defined with the isTest annotation don’t count against your organization limit of 3 MB for all Apex