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@isTest
Learn @isTest in Apex with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
@isTest is an atomic Apex topic inside Testing & Integration. The example below uses the actual construct named by the lesson rather than a generic placeholder.
Focus on what @isTest changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.
Topic-specific example
@isTest private class CalcTest { @isTest static void adds(){ System.assertEquals(4,2+2); } }
Change the key input in this Apex example and predict the result first; the named construct should be the reason the behavior changes.