/mobile-app-testing

name: mobile-app-testing
description: >
  Comprehensive mobile app testing strategies for iOS and Android. Covers unit
  tests, UI tests, integration tests, performance testing, and test automation
  with Detox, Appium, and XCTest.

Mobile App Testing

Table of Contents

• [Overview](#overview)
• [When to Use](#when-to-use)
• [Quick Start](#quick-start)
• [Reference Guides](#reference-guides)
• [Best Practices](#best-practices)

Overview

Implement comprehensive testing strategies for mobile applications including unit tests, UI tests, integration tests, and performance testing.

When to Use

• Creating reliable mobile applications with test coverage
• Automating UI testing across iOS and Android
• Performance testing and optimization
• Integration testing with backend services
• Regression testing before releases

Quick Start

Minimal working example:

// Unit test with Jest
import { calculate } from "../utils/math";

describe("Math utilities", () => {
  test("should add two numbers", () => {
    expect(calculate.add(2, 3)).toBe(5);
  });

  test("should handle negative numbers", () => {
    expect(calculate.add(-2, 3)).toBe(1);
  });
});

// Component unit test
import React from "react";
import { render, screen } from "@testing-library/react-native";
import { UserProfile } from "../components/UserProfile";

describe("UserProfile Component", () => {
  test("renders user name correctly", () => {
    const mockUser = { id: "1", name: "John Doe", email: "john@example.com" };
    render(<UserProfile user={mockUser} />);

    expect(screen.getByText("John Doe")).toBeTruthy();
  });
// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the `references/` directory:

| Guide | Contents | |---|---| | [React Native Testing with Jest & Detox](references/react-native-testing-with-jest-detox.md) | React Native Testing with Jest & Detox | | [iOS Testing with XCTest](references/ios-testing-with-xctest.md) | iOS Testing with XCTest | | [Android Testing with Espresso](references/android-testing-with-espresso.md) | Android Testing with Espresso | | [Performance Testing](references/performance-testing.md) | Performance Testing |

Best Practices

✅ DO

• Write tests for business logic first
• Use dependency injection for testability
• Mock external API calls
• Test both success and failure paths
• Automate UI testing for critical flows
• Run tests on real devices
• Measure performance on target devices
• Keep tests isolated and independent
• Use meaningful test names
• Maintain >80% code coverage

❌ DON'T

• Skip testing UI-critical flows
• Use hardcoded test data
• Ignore performance regressions
• Test implementation details
• Make tests flaky or unreliable
• Skip testing on actual devices
• Ignore accessibility testing
• Create interdependent tests
• Test without mocking APIs
• Deploy untested code