App Testing Basics — Free App Development Tutorial

TL;DR: Learn App Testing Basics in App Development with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

App Testing Basics in App Development

Testing verifies that your app behaves correctly, catches bugs early, and prevents regressions when code changes.

Unit tests check individual functions in isolation; integration tests check how components work together; end-to-end (E2E) tests simulate real user interactions.

Jest is a popular JavaScript testing framework with built-in assertions, mocking, and coverage reporting.

Test-Driven Development (TDD) means writing tests before writing the code they test.

Automated testing is essential for maintaining code quality in teams and CI/CD pipelines.

// Jest unit test example
import { add, formatDate } from './utils';

test('add returns correct sum', () => {
  expect(add(2, 3)).toBe(5);
  expect(add(-1, 1)).toBe(0);
});

test('formatDate formats correctly', () => {
  expect(formatDate('2024-01-15')).toBe('Jan 15, 2024');
});

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