unit-test-ios

Create XCTest-based unit tests for iOS apps with Swift or Objective-C.

Updated Mar 18, 2026

Search Tags:#swift #ios #unit-test #mocking #xctest #objective-c #testing-patterns

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npx skills add https://github.com/sunzhk/shared-skills --skill unit-test-ios

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Skill: unit-test-ios
Source: https://github.com/sunzhk/shared-skills/tree/main/unit-test-guide-skills/unit-test-ios
Command: npx skills add https://github.com/sunzhk/shared-skills --skill unit-test-ios

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

iOS teams struggle to establish consistent, maintainable unit tests that cover business logic, state changes, and asynchronous flows. This Skill provides a structured XCTest/Swift Testing based approach to unit testing for iOS apps, including guidance on test structure, mocks, and coverage strategies.

Core Features & Use Cases

Establishes a baseline XCTest/Swift Testing approach for iOS apps (Swift/ObjC) aligned with Apple guidance.
Recommends test pyramid, asynchronous testing patterns, and dependency isolation via protocols.
Use Case: When implementing a new feature, create unit tests that validate business rules, state transitions, and error handling with deterministic substitutes.

Quick Start

Create a baseline XCTest file and add a sample test for a simple use case.

Frequently Asked Questions about unit-test-ios

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

FAQPage Schema

How do I write unit tests for iOS apps using XCTest?▼

XCTest unit testing for iOS apps involves creating structured test cases that validate business rules, state transitions, and error handling. You establish a baseline XCTest file aligned with Apple guidance to ensure deterministic test execution.

What is the best way to isolate dependencies for deterministic iOS unit tests?▼

Dependency isolation for deterministic iOS unit tests is achieved by using protocols as substitutes. This mocking pattern allows you to simulate state changes and error handling without relying on external systems or unpredictable asynchronous flows.

Does this iOS unit testing guidance work with both Swift and Objective-C?▼

Yes, the XCTest-based unit testing guidance applies to iOS apps using both Swift and Objective-C. It covers framework selection and test structure tailored for both languages to maintain consistent testing patterns across your project.

How do I handle asynchronous testing patterns in XCTest?▼

Asynchronous testing in XCTest uses specific patterns to handle async flows and state changes reliably. The guidance covers these patterns to ensure your tests wait for operations to complete and validate results deterministically.

XCTest vs Swift Testing: which framework should I use for iOS unit tests?▼

Choosing between XCTest and Swift Testing depends on your project needs. This guidance provides framework selection recommendations, comparing both to help you establish the right test pyramid and coverage strategies for your iOS app.