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testing-test-contract

Generate reusable contract test suites for Swift protocols.

4|1|Updated Apr 2, 2026
Search Tags:#tdd#protocol#swift#unit-testing#contract-testing#generate#tests
One-click install
npx skills add https://github.com/AutisticAF/claude-code-apple-dev-plugin --skill testing-test-contract
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: testing-test-contract
Source: https://github.com/AutisticAF/claude-code-apple-dev-plugin/tree/main/skills/testing-test-contract
Command: npx skills add https://github.com/AutisticAF/claude-code-apple-dev-plugin --skill testing-test-contract

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Provide a repeatable way to define behavioral contracts as test suites so every implementation of a protocol can be verified to satisfy the same expectations, preventing regressions and implementation drift.

Core Features & Use Cases

  • Reusable Generic Test Suites: Generates parameterizable contract tests that can be applied to multiple concrete implementations (in-memory, database, cloud, mocks).
  • Behavioral & Invariant Checks: Encodes expected method behaviors, edge cases, error conditions, and invariants (for example count consistency, retrieval semantics, and update behavior).
  • Test Organization Patterns: Supports per-implementation suites or a single parameterized suite to run the same assertions across implementations, useful for swapping persistence layers, validating AI-generated code, or ensuring mock parity.

Quick Start

Generate a contract test suite for the DataStore protocol that verifies save, fetch, delete, fetchAll behaviors and invariants.

Frequently Asked Questions about testing-test-contract

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I write contract tests for Swift protocols to verify multiple implementations?▼

Contract tests for Swift protocols validate behavioral conformance by generating reusable, parameterized test suites. These suites assert method behaviors, invariants, and edge cases across any concrete implementation, ensuring all variations satisfy the same expectations.

What is the best way to ensure mock implementations match real Swift data stores?▼

Contract testing ensures mock implementations match real Swift data stores by running identical parameterized assertions across both. This validates behavioral conformance, retrieval semantics, and error handling, preventing implementation drift and mock parity issues.

How do I test Swift protocol invariants and edge cases across different persistence layers?▼

Testing Swift protocol invariants across persistence layers uses parameterized contract test modules. You pass concrete implementations into generic test suites that automatically assert count consistency, update behaviors, and error conditions for each layer.

Can I use contract testing to validate AI-generated Swift code against a protocol?▼

Yes, contract testing validates AI-generated Swift code by parameterizing generic test suites with the AI implementation. The suite asserts method behaviors, invariants, and concurrency to verify the generated code conforms to the expected protocol contract.

Does contract testing require external dependencies to generate test suites for Swift protocols?▼

No, this contract testing approach requires no external dependencies to generate test suites for Swift protocols. It produces reusable, generic test modules parameterized by your concrete implementations to validate behavioral conformance natively.

What edge cases and error handling should contract tests cover for Swift network clients?▼

Contract tests for Swift network clients should cover method behaviors, retrieval semantics, error conditions, concurrency, and invariants. Generated suites assert these edge cases parameterized by the implementation to ensure consistent behavioral conformance.

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