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The data loader is used to insert, update, or delete large amounts of data at once. This is great for bulk testing parts of your code...

Unit tests are class methods that verify whether a particular piece of code is working properly. Unit test methods take no arguments,...

Save the csv file as a static resource. In the test class, use the method: List<sObject> ls = Test.loadData(<ObjectType>.sObjectType,'<na...

Create test data Call the Apex class method in the test method Verify results using System.asserts or assertequals

create unit tests run unit tests run only code marked as tests check the test result check code coverage that should be minimum 75...

Six Tips to Great Unit Tests https://developer.salesforce.com/blogs/developer-relations/2016/07/six-tips-great-unit-tests.html Tests run...