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)
// 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)
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)
@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