music_library/backlog/tasks/ml-194 - Add-selective-low-priority-smoke-coverage.md

id, title, status, assignee, created_date, updated_date, labels, dependencies, documentation, priority, ordinal

id	title	status	assignee	created_date	updated_date	labels	dependencies	documentation	priority	ordinal
ML-194	Add selective low-priority smoke coverage	To Do		2026-05-20 17:19	2026-05-20 17:20	testing coverage		docs/architecture.md docs/project-conventions.md docs/production-infrastructure.md .agents/skills/testing/SKILL.md .agents/skills/oban-worker/SKILL.md .agents/skills/ui-framework/SKILL.md	low	37000

Description

Add only low-cost tests for low-coverage wiring where there is a real regression signal. This task should not chase percentages with brittle route enumeration, supervision-shape assertions, or Phoenix framework behavior. Focus on thin bulk worker delegation, timezone/static-asset hook assignment if practical, and browser CSP/header behavior.

Acceptance Criteria

• #1 Bulk cron worker smoke tests verify each all-record/all-artist worker delegates to the corresponding batch flow and enqueues the expected downstream jobs for representative records or artist infos.
• #2 The bulk worker tests avoid duplicating full single-item worker API refresh behavior that is already covered elsewhere.
• #3 A browser pipeline test asserts the Content-Security-Policy header includes the app-specific image, worker, connect, frame-ancestor, and base-uri directives that matter for current features.
• #4 GetTimezone hook coverage verifies a provided connect-param timezone is assigned and missing connect params fall back to MusicLibrary.default_timezone/0, if this can be tested without brittle framework setup.
• #5 StaticAssets hook coverage is added only if it can assert the assigned value through an existing LiveView request without coupling to Phoenix internals.
• #6 No tests are added for Application child ordering, exhaustive route enumeration, or framework-generated static_changed?/1 behavior unless a concrete project regression is identified.

Implementation Plan

1. Read docs/architecture.md, docs/project-conventions.md, docs/production-infrastructure.md, .agents/skills/testing/SKILL.md, and .agents/skills/oban-worker/SKILL.md before editing tests.
2. Add a small parameterized worker smoke test file for the all-record/all-artist workers, asserting the expected downstream enqueue behavior through existing batch flows.
3. Keep worker tests shallow: do not stub or exercise external API refresh behavior already covered by single-item worker tests.
4. Add a browser pipeline/controller test for the CSP header on a representative HTML route, asserting only directives that are project-specific and important to current features.
5. Investigate GetTimezone/StaticAssets hook coverage; add tests only if they can be expressed through stable public LiveView behavior without coupling to Phoenix internals.
6. Explicitly avoid Application child ordering, exhaustive route list, and framework static_changed?/1 tests.
7. Run the targeted worker/controller/hook tests and any affected web test file.