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exunit-code-review

Reviews ExUnit test code for proper patterns, boundary mocking with Mox, and test adapter usage. Use when reviewing _test.exs files or test helper configurations.

한국어 요약은 준비 중입니다. 원문 설명을 표시하고 있습니다.

설치 방법 보기

포함된 파일(5)

  • SKILL.md3.4 KB
  • references/exunit-patterns.md3.2 KB
  • references/integration-tests.md4.1 KB
  • references/mox-boundaries.md3.3 KB
  • references/test-adapters.md3.8 KB

SKILL.md(원문)

설치하기 전에 에이전트에게 전달되는 지시 내용을 확인할 수 있습니다.

ExUnit Code Review

Quick Reference

Issue TypeReference
Async tests, setup, describe, tagsreferences/exunit-patterns.md
Behavior-based mocking, expectationsreferences/mox-boundaries.md
Bypass, Swoosh, Oban testingreferences/test-adapters.md
What to mock vs real, Ecto sandboxreferences/integration-tests.md

Mock Boundary Philosophy

Mock at external boundaries:

  • HTTP clients, external APIs, third-party services
  • Slow resources: file system, email, job queues
  • Non-deterministic: DateTime.utc_now(), :rand

DO NOT mock internal code:

  • Contexts, schemas, GenServers
  • Internal modules, PubSub
  • Anything you wrote

Review Checklist

Test Structure

  • Tests are async: true unless sharing database state
  • Describe-blocks group related tests
  • Setup extracts common test data
  • Tests have clear arrange/act/assert structure

Mocking

  • Mox used for external boundaries (HTTP, APIs)
  • Behaviors defined for mockable interfaces
  • No mocking of internal modules
  • verify_on_exit! in setup for strict mocking

Test Adapters

  • Bypass for HTTP endpoint mocking
  • Swoosh.TestAdapter for email testing
  • Oban.Testing for background job assertions

Database

  • Ecto.Adapters.SQL.Sandbox for isolation
  • Async tests don't share database state
  • Fixtures/factories used consistently

Valid Patterns (Do NOT Flag)

  • Mock in unit test, real in integration - Different test levels have different needs
  • Not mocking database in integration tests - Database is internal
  • Simple inline test data - Not everything needs factories
  • Testing private functions via public API - Correct approach

Context-Sensitive Rules

IssueFlag ONLY IF
Not asyncTest actually needs shared state
Missing mockExternal call exists AND no mock/bypass
Mock internalModule being mocked is internal code

Gates (sequence)

Complete in order. Do not emit a finding until the prior step passes for that issue.

  1. Evidence from the file — Open the test module (or helper) and tie the claim to concrete lines.

    • Pass when: Each prospective finding includes [FILE:LINE] and a one-line factual description of what is on that line (or an adjacent line you name), not a generic style complaint.
  2. ExUnit false-positive veto — Check this skill’s Valid Patterns and Context-Sensitive Rules for the case.

    • Pass when: You can state “not covered by Do NOT Flag / Flag ONLY IF” in one sentence, or you drop the finding.
  3. Cross-protocol verification — Apply review-verification-protocol (e.g. read full function/block, search usages before “unused” claims) to that same finding.

    • Pass when: At least one protocol check relevant to the claim type is satisfied and would appear in your rationale if challenged.

Before Submitting Findings

Use [FILE:LINE] ISSUE_TITLE per finding after Gates (sequence) and the linked protocol are satisfied.

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