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

mobile-app-testing

Mobile App Testing

Table of Contents

Overview

When to Use