Mobile App Testing
Table of Contents
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 | React Native Testing with Jest & Detox |
| iOS Testing with XCTest | iOS Testing with XCTest |
| Android Testing with Espresso | Android Testing with Espresso |
| Performance Testing | 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