4 AL/BC testing patterns from an external BC testing expert's blog (Luc van Vugt, fluxxus.nl)

[Michael Dieringer (MichaelDieringer)]

Summary

Fourth batch from CURABIS ApS, this time mined from a source outside CURABIS itself: Luc van Vugt's fluxxus.nl, a long-running blog by a BC/NAV developer who authored a book on automated testing and ATDD in Business Central. The blog runs 2009–2023 and is mostly legacy classic-client/C-AL content; these 4 are the patterns that survived a full read-through, are still current in modern AL, and cleared BCQuality's admission test.

• Confirm() + StrSubstNo: a [ConfirmHandler]'s Question parameter receives the raw, unsubstituted template when Confirm is called with its own placeholder-substitution overload — the production code must build the string with StrSubstNo first for a handler-side assertion to see the real message.
• Table Relation Test's OnAfterRemoveTableRelation exclusion hook — verified directly against BCApps source (codeunit 134926 "Table Relation Test", src/Layers/W1/Tests/Misc/TableRelationTest.Codeunit.al) rather than taken on the blog's word alone.
• Shared/lazy Initialize() fixture data needs an explicit Commit(), or it rolls back with the first test that creates it and silently vanishes for every test after.
• Assert.IsFalse for a boolean check, not asserterror wrapped around Assert.IsTrue — asserterror verifies that an error was raised, not the value under test.

Two other candidates found during mining were rejected: a TestPermissions::InheritFromTestCodeunit enum-value restriction (too thin/overlapping the existing permission-tests rule) and a suite-wide fixture-injection event pattern from 2018/2020 NAV content that no longer exists anywhere in current BCApps source (verified absent, not proposed).

Test plan

• CI frontmatter/format validation passes
• Domain-owning reviewers confirm placement and accuracy per file

🤖 Generated with Claude Code

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