---
id: change/bcquality/62
type: change
title: "#62 Add testing knowledge: UI handlers, table relations, asserterror, fixtures (P1+P2)"
summary: "Adds three testing knowledge articles to BCQuality under microsoft/knowledge/testing: UI handlers in tests, pairing asserterror with expected error checks, and using library codeunits for test fixtures. Each article has a markdown page plus good and bad AL examples."
tier: official
language: en
tags:
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  - main
system: development
review:
  state: reviewed
  by: opus
  at: "2026-10-08T02:13:37.791Z"
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evidence:
  - kind: code
    url: https://github.com/microsoft/BCQuality/pull/62
    title: "microsoft/BCQuality#62: Add testing knowledge: UI handlers, table relations, asserterror, fixtures (P1+P2)"
    date: "2026-07-09"
    commit: 3aa3581f9563b64e6fa370cc722dbca23775f225
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number: 62
repo: microsoft/BCQuality
source_id: bcquality-prs
url: https://github.com/microsoft/BCQuality/pull/62
kind: pr
base_branch: main
major: null
merged_at: "2026-07-09T08:24:51Z"
author: JesperSchulz
author_type: User
community_contribution: false
labels: []
change_class: code
change_kind: feature
behavior_change: false
breaking: false
files:
  count: 9
  additions: 277
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  - path: microsoft/knowledge/testing/asserterror-needs-expectederror-and-code.md
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  - path: microsoft/knowledge/testing/ui-handlers-in-tests.bad.al
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  - path: microsoft/knowledge/testing/use-library-codeunits-for-test-fixtures.good.al
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  - path: microsoft/knowledge/testing/use-library-codeunits-for-test-fixtures.md
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---

# #62 Add testing knowledge: UI handlers, table relations, asserterror, fixtures (P1+P2)

> Adds three testing knowledge articles to BCQuality under microsoft/knowledge/testing: UI handlers in tests, pairing asserterror with expected error checks, and using library codeunits for test fixtures. Each article has a markdown page plus good and bad AL examples.

[Pull request](https://github.com/microsoft/BCQuality/pull/62) · merged into `main` on 2026-07-09 by JesperSchulz · 9 files (+277 -0), 9 AL · feature · tier official · reviewed (checked by Opus)

## What changed

- New article on UI handlers needed for UI calls in tests
- New article on pairing asserterror with Assert.ExpectedError and ExpectedErrorCode
- New article on using library codeunits instead of hand-rolled Init/Insert fixtures
- Each article ships as a markdown file with good and bad AL samples
- Content targets BC-specific test mechanics that LLMs tend to get wrong

## AL objects touched

- `microsoft/knowledge/testing/asserterror-needs-expectederror-and-code.bad.al`: added, not in the BC? snapshot yet
- `microsoft/knowledge/testing/asserterror-needs-expectederror-and-code.good.al`: added, not in the BC? snapshot yet
- `microsoft/knowledge/testing/asserterror-needs-expectederror-and-code.md`: added, not in the BC? snapshot yet
- `microsoft/knowledge/testing/ui-handlers-in-tests.bad.al`: added, not in the BC? snapshot yet
- `microsoft/knowledge/testing/ui-handlers-in-tests.good.al`: added, not in the BC? snapshot yet
- `microsoft/knowledge/testing/ui-handlers-in-tests.md`: added, not in the BC? snapshot yet
- `microsoft/knowledge/testing/use-library-codeunits-for-test-fixtures.bad.al`: added, not in the BC? snapshot yet
- `microsoft/knowledge/testing/use-library-codeunits-for-test-fixtures.good.al`: added, not in the BC? snapshot yet
- `microsoft/knowledge/testing/use-library-codeunits-for-test-fixtures.md`: added, not in the BC? snapshot yet

## Context

- Systems: development

Source: metadata of a merged pull request in microsoft/BCQuality (bcquality): title, labels, changed paths and counts, with a summary in our words. No source text and no description beyond one short quote (D10, D61).