Testing 🧪 ምርምር!

// ── Functionን Test ማድረግ ──────────────────────────────
function add(a, b) { return a + b; }
function divide(a, b) {
  if (b === 0) throw new Error('በዜሮ ማካፈል አይቻልም!');
  return a / b;
}

// ── Tests ────────────────────────────────────────
describe('Math functions', () => {

  it('add(2, 3) should return 5', () => {
    expect(add(2, 3)).toBe(5);  // ✅ Pass!
  });

  it('add negative numbers', () => {
    expect(add(-1, -2)).toBe(-3); // ✅ Pass!
  });

  it('divide normally', () => {
    expect(divide(10, 2)).toBe(5); // ✅ Pass!
  });

  it('በዜሮ ማካፈል — Error ይፈጥራል', () => {
    expect(() => divide(5, 0))
      .toThrow('በዜሮ ማካፈል አይቻልም!'); // ✅
  });
});

import { render, screen, fireEvent } from '@testing-library/react';
import Counter from './Counter';

describe('Counter Component', () => {

  it('በ 0 ይጀምራል', () => {
    render(<Counter />);
    // Screen ላይ "Count: 0" አለ?
    expect(screen.getByText('Count: 0')).toBeInTheDocument();
  });

  it('+ ቁልፍ ሲጫኑ count ይጨምራል', () => {
    render(<Counter />);
    const btn = screen.getByRole('button', { name: '+' });
    fireEvent.click(btn); // Click ！
    expect(screen.getByText('Count: 1')).toBeInTheDocument();
  });

  it('3 ጊዜ click ሲደረግ = Count: 3', () => {
    render(<Counter />);
    const btn = screen.getByRole('button', { name: '+' });
    fireEvent.click(btn);
    fireEvent.click(btn);
    fireEvent.click(btn);
    expect(screen.getByText('Count: 3')).toBeInTheDocument();
  });
});