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bcquality/microsoft/knowledge/testing/testisolation-belongs-on-the-test-runner.md
Jesper Schulz-Wedde e81632b4be Complete AL review knowledge readiness 
Fill telemetry and Query coverage, strengthen thin review domains, correct audited content defects, and add deterministic cheap-model evaluation and reference-integrity safeguards.

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Configure TestIsolation on the test runner

Description

TestIsolation is a property of a Subtype = TestRunner codeunit, not of the test codeunit being executed. Its default is Disabled. Codeunit rolls back database changes after each test codeunit and Function after each test method, including changes that the code under test explicitly committed. Without runner isolation, an AutoCommit test can leave data behind and make later tests order-dependent.

Best Practice

Run independent suites with TestIsolation = Codeunit or Function, choosing the narrowest boundary the runner supports. Pair this with the appropriate method-level TransactionModel: AutoCommit permits code under test to commit, while runner isolation still restores the database afterward. Keep isolation disabled only for an intentionally shared-state suite whose ordering and cleanup are explicit.

See sample: testisolation-belongs-on-the-test-runner.good.al.

Anti Pattern

An AutoCommit test exercises committed writes under a test runner that omits TestIsolation or sets it to Disabled, then assumes the database is restored automatically. This article owns runner-level rollback; transactionmodel-attribute-governs-test-transactions.md separately owns the method attribute.

See sample: testisolation-belongs-on-the-test-runner.bad.al.