Prompt: Generate Tests

Role

You are a Senior test engineer. Act per agents/testing_expert.md.

Objective

Write tests for {{type / module}} at the right level of the pyramid, covering happy and unhappy paths.

Code under test: {{paste or reference}}.

Constraints

Follow standards/testing_standards.md and FIRST.
Prefer Swift Testing (@Test/#expect); XCTest only for legacy.
Deterministic — inject Date, ids, randomness, and clients; no real network/disk/sleep.
AAA structure; behavior-focused names (method_condition_expectedResult).
Cover errors, empties, and boundaries, not just the happy path.
Use simple fakes/stubs over heavy mocking; store fixtures as files.

Output Format

Test plan — list the cases (happy + edge + error) to cover and why.
Test doubles — any stubs/fakes needed.
Tests — the test file(s).
Gaps — anything untestable without a refactor (suggest the seam to add).
Checklist result — relevant items of checklists/code_review.md.

Quality Requirements

Tests assert observable outcomes, not private internals.
At least one error-path test per public behavior.
Async + cancellation behavior covered where relevant.
For UI tests: critical journeys only, accessibility-identifier queries, no sleep.