Rationale
As a best practice, tests should always be isolated and create their own data. Accessing the org data for unit tests, using the annotation @IsTest(seeAllData=true), should be avoided.
Scope
Apex test classes
Apex test methods
Test data isolation
Ensure that test methods create their own data and don't access actual data in your org.
Written by Lorenzo Frattini. Updated over a week ago
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