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RunAs in tests
Learn RunAs in tests in Apex with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.
RunAs in tests is an atomic Apex topic inside Security & Sharing. The example below uses the actual construct named by the lesson rather than a generic placeholder.
Focus on what RunAs in tests 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
System.runAs(testUser){ System.assertEquals(testUser.Id, UserInfo.getUserId()); }
Change the key input in this Apex example and predict the result first; the named construct should be the reason the behavior changes.