bcquality/microsoft/knowledge/testing/given-blocks-must-cover-full-precondition-chain.md
Michael Dieringer 67962727f6 Fix ten focused correctness items plus sample links from Jesper's 2026-09-15 re-review
Six carried-over threads:
- api-page-least-privilege-write-access fixtures: added the mandatory
  EntityName/EntitySetName properties (AL0485).
- pages-must-not-contain-business-logic fixtures: Sales Line has no
  "Total Amount" field; replaced with the real "Line Amount" (field 103).
- test-feature-scenario-tags.good.al and test-one-when-per-test.good.al:
  CreatePriceHeader leaves a price list in Draft status, which price
  calculation ignores. Added Validate(Status, Active) + Modify before the
  sales line that depends on it. Verified Status field/enum against
  PriceListHeader.Table.al and PriceStatus.Enum.al in the BCApps clone.
- exposed-objects-must-be-in-a-permission-set.md: a published codeunit is
  a SOAP endpoint (SOAP is deprecated), not OData - Page/Query are the
  OData object types. Corrected and pointed new integrations at API
  pages/queries instead.
- al-error-handling-review.md: the log-writes-must-survive-rollback cue
  selected on Session.StartSession, which only appears in the compliant
  fix, never in the anti-pattern - the bad fixture could never be
  worklisted. Recued on the actual risk shape (log insert around a
  failed TryFunction/GetLastError* path, then raise/propagate), with
  StartSession as an explicit compliant discriminator instead.
- page-design-must-match-bc-page-type-conventions.md: the enum value is
  NavigatePage, not Navigate; noted the type list is a selected subset,
  not an exhaustive PageType catalogue (PromptDialog, ConfigurationDialog,
  UserControlHost, XmlPort also exist, out of this article's scope).

Four new correctness gaps:
- release-must-update-app-version.md: "the version is the only identity"
  was backwards - id is the app's stable identity, version identifies a
  release/code-state of it.
- defensive-vs-offensive-code-must-match-blast-radius.good.al: the "low
  blast radius" example had no else branch, so a failed Customer.Get()
  left the field at its prior/default value instead of the explicit
  chosen fallback the article claims to demonstrate. Added the else.
- bcpt-scenarios-must-be-app-specific.good.al: InitTest and both measured
  StartScenario/EndScenario sections were empty/comment-only, so the
  "app-specific" fixture measured no actual work. Filled in a real,
  self-contained header+line creation path.
- upgrade-tag-logic-must-not-nest-deeply.good.al: the flattened version
  dropped both safety conditions the bad fixture had (Discount % = 0,
  nonblank posting group), silently changing behavior instead of just
  removing nesting. Extracted the guarded update into a helper with both
  conditions preserved as early exits.

Also converted this PR's remaining plain-backtick "See sample:" sample
references (16 articles) to the READ-convention markdown-link form,
matching the fix already made on #156/#158.

Rebased onto upstream/main (conflicts in al-ui-review.md, al-style-review.md,
al-upgrade-review.md against merged upstream PRs - all additive, both
sides' worklist cues retained).
2026-09-21 22:44:17 +02:00

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2.1 KiB
Markdown

---
bc-version: [all]
domain: testing
keywords: [given, test-setup, posting, report, request-page, precondition, completeness]
technologies: [al]
countries: [w1]
application-area: [all]
---
# Cover the full precondition chain in GIVEN, not just the primary record
## Description
A `[GIVEN]` block is only correct if it sets up every precondition the code under test actually reads, not just the record the scenario is "about." For most master-data tests, creating the primary record is enough. For posting routines and reports it usually is not: an incomplete `[GIVEN]` produces a test that either fails with a setup error unrelated to the scenario, or worse, passes without ever reaching the logic it claims to verify.
## Best Practice
For a posting test, set up the full posting-group chain the document requires (e.g. customer/vendor posting group, gen. business/product posting group, VAT posting setup), the setup records the specific posting path reads, and an explicit date when the path is date-sensitive — a missing link surfaces as an unrelated G/L error, not a meaningful test failure. For a report test that claims to verify filtering or dataset logic, include both a record that should be included and one that should be excluded, plus any request-page parameter or FlowField the report's logic branches on. A report test that only claims to run without error is exempt from the include/exclude pairing, but it must say so in its scenario name or comment — an unlabelled single-record `[GIVEN]` is ambiguous about which claim it is making, and that ambiguity is itself the defect.
See sample: [`given-blocks-must-cover-full-precondition-chain.good.al`](given-blocks-must-cover-full-precondition-chain.good.al).
## Anti Pattern
A posting test whose `[GIVEN]` creates only the sales header, relying on whatever posting groups happen to exist in the test company. A report test whose `[GIVEN]` creates only matching records, so the report "passes" whether or not its filter logic does anything at all.
See sample: [`given-blocks-must-cover-full-precondition-chain.bad.al`](given-blocks-must-cover-full-precondition-chain.bad.al).