Contract Test Generator Skill

Generates contract tests for API migrations, supporting consumer-driven contracts, provider verification, and breaking change detection.

Purpose

Enable API contract testing for:

• Consumer contract generation
• Provider verification
• Schema validation
• Breaking change detection
• Mock server generation

Capabilities

1. Consumer Contract Generation

• Generate from API usage
• Extract from tests
• Build from specs
• Support multiple formats

2. Provider Verification

• Verify against contracts
• Test all consumers
• Check compatibility
• Document failures

3. Schema Validation

• Validate request schemas
• Check response schemas
• Verify data types
• Enforce constraints

4. Breaking Change Detection

• Detect field removals
• Find type changes
• Identify required additions
• Flag compatibility issues

5. Mock Server Generation

• Generate from contracts
• Support stub responses
• Handle scenarios
• Enable development isolation

6. Contract Versioning

• Track contract versions
• Manage compatibility
• Support migrations
• Document changes

Tool Integrations

| Tool | Purpose | Integration Method | |------|---------|-------------------| | Pact | Consumer-driven contracts | CLI | | Spring Cloud Contract | Java contracts | CLI | | Dredd | API validation | CLI | | Prism | Mock server | CLI | | WireMock | Mock server | CLI |

Output Schema

json
{
  "generationId": "string",
  "timestamp": "ISO8601",
  "contracts": [
    {
      "consumer": "string",
      "provider": "string",
      "interactions": [
        {
          "description": "string",
          "request": {},
          "response": {}
        }
      ]
    }
  ],
  "verification": {
    "passed": "boolean",
    "results": []
  },
  "artifacts": {
    "contractFiles": [],
    "mockServerConfig": "string"
  }
}

Integration with Migration Processes

• api-modernization: Contract verification
• monolith-to-microservices: Service contracts

Related Skills

• openapi-generator: Spec generation
• api-compatibility-analyzer: Breaking changes

Related Agents

• regression-detector: Regression prevention
• cross-team-integrator: Contract coordination