[Angular] Unit Test

describe('KRWCashCalculator', () => {
  let calculator: ICashCalculator;
  beforeEach(() => {
    calculator = new KRWCashCalculator();
  });

  // setAmount 함수 테스트
  [
    { initialAmount: 10000, amount: 10000 },
    { initialAmount: 100000, amount: 100000 },
  ].forEach(({ initialAmount, amount }) => {
    it(`setAmount 검증 (초기 금액: ${initialAmount}) => calculator.amount: ${amount}원`, () => {
      calculator.setAmount(initialAmount);
      expect(calculator.amount).toBe(amount);
    });
  });

  // plus 버튼 테스트
  [
    { initialAmount: 12000, nextAmount: 15000, nextBonus: 2000 },
    { initialAmount: 15000, nextAmount: 20000, nextBonus: 3000 },
    { initialAmount: 20000, nextAmount: 22000, nextBonus: 3000 },
    { initialAmount: 50000, nextAmount: 55000, nextBonus: 8000 },
    { initialAmount: 55000, nextAmount: 60000, nextBonus: 9000 },
    { initialAmount: 100000, nextAmount: 110000, nextBonus: 16500 },
    { initialAmount: 990000, nextAmount: 1000000, nextBonus: 150000 },
  ].forEach(({ initialAmount, nextAmount, nextBonus }) => {
    it(`plus 검증 (초기 금액: ${initialAmount}) => ${nextAmount}원  (+${nextBonus}원 적립)`, () => {
      calculator.setAmount(initialAmount);
      calculator.plus();
      expect(calculator.amount).toBe(nextAmount);
      expect(calculator.bonus).toBe(nextBonus);
    });
  });

  // minus 버튼 테스트
  [
    { initialAmount: 15000, prevAmount: 12000, prevBonus: 1500 },
    { initialAmount: 20000, prevAmount: 15000, prevBonus: 2000 },
    { initialAmount: 22000, prevAmount: 20000, prevBonus: 3000 },
    { initialAmount: 55000, prevAmount: 50000, prevBonus: 7500 },
    { initialAmount: 60000, prevAmount: 55000, prevBonus: 8000 },
    { initialAmount: 110000, prevAmount: 100000, prevBonus: 15000 },
    { initialAmount: 1000000, prevAmount: 990000, prevBonus: 148500 },
  ].forEach(({ initialAmount, prevAmount, prevBonus }) => {
    it(`minus 검증 (초기 금액: ${initialAmount}) => ${prevAmount}원  (+${prevBonus}원 적립)`, () => {
      calculator.setAmount(initialAmount);
      calculator.minus();
      expect(calculator.amount).toBe(prevAmount);
      expect(calculator.bonus).toBe(prevBonus);
    });
  });

  // get bonus() 테스트
  [
    { initialAmount: 12000, bonus: 1500 },
    { initialAmount: 15000, bonus: 2000 },
    { initialAmount: 20000, bonus: 3000 },
    { initialAmount: 55000, bonus: 8000 },
    { initialAmount: 95000, bonus: 14000 },
    { initialAmount: 1000000, bonus: 150000 },
  ].forEach(({ initialAmount, bonus }) => {
    it(`bonus 검증 (초기 금액: ${initialAmount}) => +${bonus}원 적립`, () => {
      calculator.setAmount(initialAmount);
      expect(calculator.bonus).toBe(bonus);
    });
  });
});