Currency

interface CurrencyMap {
  [key: string]: {
    title: string;
    symbol: string;
  };
}
 
class Currency {
  private value: string;
  private currencyMap: CurrencyMap = {
    EUR: {
      title: "Euro",
      symbol: "€",
    },
    CHF: {
      title: "Swiss Franc",
      symbol: "Fr",
    },
    USD: {
      title: "US Dollar",
      symbol: "$",
    },
    DKK: {
      title: "Danish krone",
      symbol: "kr",
    },
    NOK: {
      title: "Norwegian krone",
      symbol: "kr",
    },
    SEK: {
      title: "Swedish krona",
      symbol: "kr",
    },
    GBP: {
      title: "British Pound",
      symbol: "£",
    },
  };
 
  constructor(value: string) {
    if (!this.currencyMap[value]) {
      throw new Error(`Currency ${value} is not supported`);
    }
    this.value = value;
  }
 
  getValue(): string {
    return this.value;
  }
 
  getTitle(): string {
    return this.currencyMap[this.value].title;
  }
 
  getSymbol(): string {
    return this.currencyMap[this.value].symbol;
  }
}
 
// Example usage
const currency = new Currency("EUR");
console.log(currency.getTitle()); // Euro
console.log(currency.getSymbol()); // €

import { Currency } from "./Currency";
 
describe("Currency", () => {
  it("should throw if invalid currency", () => {
    expect(() => {
      new Currency("INVALID");
    }).toThrow("Currency INVALID is not supported");
  });
 
  it("should create a valid currency instance", () => {
    const currency = new Currency("USD");
    expect(currency.getValue()).toBe("USD");
    expect(currency.getTitle()).toBe("US Dollar");
    expect(currency.getSymbol()).toBe("$");
  });
});