Bug: utilitiescs-test-hygiene-residuals

[drmoisan]

• Work Mode: full-bug

Summary

Standing residuals issue for low-severity hygiene findings in UtilitiesCS.Test that reviews surface
but that do not each warrant their own issue. Opened with one entry: the pre-existing 1067-line
FolderPredictorTests.cs, which is more than twice the repository's 500-line file cap.

Environment

• OS/version: Windows 11 Pro 10.0.26200, .NET Framework 4.8
• Python version: not applicable
• Command/flags used: file line counts taken during issue 809's [P4-T5] gate
• Data source or fixture: not applicable

Steps to Reproduce

1. Count the lines in UtilitiesCS.Test/OutlookObjects/Folder/FolderPredictorTests.cs.
2. Compare against the 500-line cap in .claude/rules/general-code-change.md, "File Size Limit".

Expected Behavior

No test file exceeds 500 lines. The cap has no test-code exemption; the listed exemptions are
throwaway agent scripts, raw text fixtures for language-processing test data, and Markdown.

Actual Behavior

UtilitiesCS.Test/OutlookObjects/Folder/FolderPredictorTests.cs is 1067 lines.

This is pre-existing and was not introduced by issue 809; that item's line-count gate simply recorded
it. Splitting the file along its existing behavioural groupings is the obvious remedy, but it touches
a file several in-flight items depend on, so it should be sequenced rather than done opportunistically.

Logs / Screenshots

• Attached minimal logs or screenshot
• Snippet: issue 809 evidence/qa-gates/p4-t5-line-counts.md.

Impact / Severity

• Blocker
• High
• Medium
• Low

Low: a maintainability cost, with no behavioural defect. Recorded so it is not rediscovered by every
subsequent review of this assembly.

Source

From: docs/features/potential/2026-09-08-utilitiescs-test-hygiene-residuals.md

[drmoisan]

Item 812's review reached the same finding independently and added one fact worth recording here: this file is not covered by #623, which is scoped to QuickFiler.

UtilitiesCS.Test/OutlookObjects/Folder/FolderPredictorTests.cs at 1067 lines is pre-existing and was untouched by #818, so it remains this record's entry rather than being absorbed by that scope.

Source: run bugs-2026-09-06, item 812 review, 2026-09-08. The line count and the #623 scope claim are child-reported and were not independently re-derived; confirm both before acting.