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

{
  "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