# Integration E2e Testing

> Applies integration and E2E implementation, mock-boundary, and review rules. Use when: writing integration or E2E tests or reviewing their quality.

- Skill: `shinpr/integration-e2e-testing` (Agent Skill, multi-file: 3 files)
- Install (CLI): `npx skillmds@latest add shinpr/integration-e2e-testing`
- Raw SKILL.md: https://api.skillmd.com/api/skills/shinpr/integration-e2e-testing/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Integrations & APIs
- Author: shinpr (https://skillmd.com/u/shinpr)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/shinpr/integration-e2e-testing

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# Integration and E2E Test Implementation and Review Rules

## Implementation Rules

### Behavior Verification

| Step Type | Verification Target |
|-----------|---------------------|
| Trigger | Reproduce in test setup (Arrange) |
| Process | Intermediate state or function call |
| Observable Result | Final output value (return value, error message, log output) |

**Pass Criteria**: Test passes if "observable result" is verified as return value or mock call argument

### Integration Test Mock Boundaries

| Judgment Criteria | Mock | Actual |
|-------------------|------|--------|
| Part of test target? | No → Can mock | Yes → Actual required |
| External network communication? | Yes → Mock required | No → Actual recommended |

### E2E Test Execution Conditions

- Execute only after all components are implemented
- Do not use mocks (full system integration required)

## Review Criteria

### Skeleton and Implementation Consistency

| Check | Failure Condition |
|-------|-------------------|
| Behavior Verification | No assertion for "observable result" |
| Verification Item Coverage | Listed verification items not included in assertions |
| Mock Boundary | Internal components mocked in integration test |

### Implementation Quality

| Check | Failure Condition |
|-------|-------------------|
| AAA Structure | Arrange/Act/Assert separation unclear |
| Independence | State sharing between tests, execution order dependency |
| Reproducibility | Depends on date/random, results vary |
| Readability | Test name and verification content don't match |