The Salesforce Developers Blog “Month of Testing: Why We Test”1 reveals that the IBM System Science Institute discovered that it costs nearly seven times as much to fix a bug in production compared to during the testing phase of the application lifecycle. So, the more bugs we catch during predeployment testing, the better! Apex unit tests provide their own test data to achieve the 75% coverage required before Apex classes can be deployed to production. To perform end-to-end testing of your application or customization, you will need some additional test data. That same test data needs to be added to each scratch ...
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