Testing, Debugging, and Deployment

Testing, Debugging, and Deployment are critical pillars of the Salesforce Platform Developer I certification, ensuring code quality, reliability, and successful release management. **Testing:** Salesforce enforces a minimum of 75% code coverage for deploying Apex code to production. Developers write unit tests using the @isTest annotation to validate business logic. Test classes should cover positive scenarios, negative scenarios, bulk operations (testing with 200+ records), and user permission testing. Best practices include using Test.startTest() and Test.stopTest() to reset governor limits, creating test data within the test class rather than relying on org data (unless using @isTest(SeeAllData=true)), and utilizing Test.isRunningTest() for conditional logic. Test methods should include System.assert(), System.assertEquals(), and System.assertNotEquals() to verify expected outcomes. **Debugging:** Salesforce provides several tools for debugging. The Debug Log is the primary tool, capturing execution details including database operations, Apex code execution, workflow processes, and callouts. Developers can set log levels (ERROR, WARN, INFO, DEBUG, FINE, FINER, FINEST) for different categories like Apex Code, Database, and Validation. The Developer Console offers real-time log inspection, checkpoint setting, and the Query Editor for SOQL testing. Anonymous Execute allows running code snippets for quick testing. Additionally, the Checkpoints feature lets developers inspect heap snapshots at specific lines of code. **Deployment:** Moving code from sandbox to production requires several approaches. Change Sets allow point-and-click deployment between connected orgs. The Metadata API provides programmatic deployment capabilities. Salesforce CLI (SFDX) enables modern source-driven development with scratch orgs. Managed and Unmanaged Packages facilitate distribution to multiple orgs. Key considerations include ensuring sufficient test coverage, running all tests during deployment, handling dependencies correctly, and understanding deployment order. Developers must also be familiar with sandbox types (Developer, Developer Pro, Partial Copy, Full) and their appropriate use cases in the development lifecycle. Mastering these three areas ensures robust, maintainable applications on the Salesforce platform. Testing, Debugging, and Deployment are critical pillars of the Salesforce Platform Developer I certification, ensuring code quality, reliability, and successful release management. **Testing:** Salesforce enforces a minimum of 75% code coverage for deploying Apex code to production. Developers wri…