mobile-app-testing

# Mobile App Testing Implement comprehensive testing strategies for mobile applications. ## Testing Pyramid | Level | Tools | Coverage | |-------|-------|----------| | Unit | Jest, XCTest, JUnit | 70% | | Integration | Detox, Espresso | 20% | | E2E | Appium, Detox | 10% | ## React Native (Jest + Detox) ```javascript // Unit test describe('CartService', () => { it('calculates total correctly', () => { const cart = new CartService(); cart.addItem({ price: 10, quantity: 2 }); expect(cart.getTotal()).toBe(20); }); }); // E2E test (Detox) describe('Login flow', () => { beforeEach(async () => { await device.reloadReactNative(); }); it('should login successfully', async () => { await element(by.id('email-input')).typeText('user@example.com'); await element(by.id('password-input')).typeText('password123'); await element(by.id('login-button')).tap(); await expect(element(by.id('dashboard'))).toBeVisible(); }); }); ``` ## iOS (XCTest) ```swift func testLoginSuccess() { let app = XCUIApplication() app.launch() app.textFields["email"].tap() app.textFields["email"].typeText("user@example.com") app.secureTextFields["password"].typeText("password123") app.buttons["Login"].tap() XCTAssertTrue(app.staticTexts["Welcome"].exists) } ``` ## Android (Espresso) ```kotlin @Test fun loginSuccess() { onView(withId(R.id.email)).perform(typeText("user@example.com")) onView(withId(R.id.password)).perform(typeText("password123")) onView(withId(R.id.loginButton)).perform(click()) onView(withId(R.id.dashboard)).check(matches(isDisplayed())) } ``` ## Best Practices - Test business logic first (unit tests) - Mock external dependencies - Test both success and failure paths - Automate critical user flows - Maintain >80% code coverage - Test on real devices periodically ## Avoid - Testing implementation details - Hardcoded test data - Interdependent tests - Skipping error case testing