Apex Test Class
Production deployments require Apex test classes to run and pass; skipping or gaming coverage is one of the most common release-day surprises.
Definition
An Apex test class is a class annotated @isTest containing test methods that exercise other Apex code; Salesforce requires at least 75% org-wide test coverage, with no individual trigger left uncovered, before metadata containing Apex can deploy to production, though sandboxes and scratch orgs don't enforce it the same way. Test methods run against a fresh, isolated copy of the org's data by default, not real records, unless a method is explicitly marked @isTest(SeeAllData=true), which is why tests that silently depend on org data pass locally but fail in a clean CI pipeline. Coverage percentage alone doesn't guarantee a test is meaningful: assertion-free tests that only exist to hit the 75% threshold pass the deploy gate while testing nothing, a common way “green” pipelines still ship broken logic. Our CI/CD pipeline guide covers running Apex tests as part of a build.
How it works in Serpent
Serpent runs Apex tests as part of preflight before a deployment ships, not after, so a coverage or assertion failure blocks the release instead of surfacing in production. Test results and logs stay attached to the task that triggered them, so failures are traceable to the change that caused them. See release management in Serpent for how preflight checks work.
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