passingtest.ts

export class Calculator() {
  public add(firstAddend: number, secondAddend: number): number {
    return firstAddend + secondAddend;
  }
}

// ✅test passes, we're all happy
describe('Calculator', () => {
    it('sums up two numbers properly', () => {
      calculator = new Calculator();
      expect(calculator.add(2,2)).to.equal(4);
    });
});