Value Objects
Phone Number

Phone Number

class PhoneNumber {
  private number: string;
 
  constructor(number: string) {
    if (!this.isValidPhoneNumber(number)) {
      throw new Error(
        "Invalid phone number. Please provide a valid phone number."
      );
    }
    this.number = number;
  }
 
  equals(other: PhoneNumber): boolean {
    return this.number === other.number;
  }
 
  toString(): string {
    return this.number;
  }
 
  private isValidPhoneNumber(number: string): boolean {
    // This is a basic phone number validation. You can adapt it to your specific requirements.
    const phoneRegex = /^\d{10}$/; // For a 10-digit phone number
    return phoneRegex.test(number);
  }
}
 
// Example usage:
const validPhoneNumber = new PhoneNumber("1234567890");
const invalidPhoneNumber = new PhoneNumber("invalid_phone_number");
console.log(validPhoneNumber.toString()); // Output: "1234567890"
console.log(invalidPhoneNumber.toString()); // Throws an error for an invalid phone number

Specs

// Import the PhoneNumber class (assuming it's in a separate file)
import { PhoneNumber } from "./phoneNumber";
 
describe("PhoneNumber", () => {
  describe("constructor", () => {
    it("should create a PhoneNumber instance with a valid phone number", () => {
      expect(() => new PhoneNumber("1234567890")).not.toThrow();
    });
 
    it("should throw an error for an invalid phone number", () => {
      expect(() => new PhoneNumber("invalid_phone_number")).toThrow();
    });
  });
 
  describe("equals", () => {
    it("should return true when comparing two PhoneNumber instances with the same number", () => {
      const phoneNumber1 = new PhoneNumber("1234567890");
      const phoneNumber2 = new PhoneNumber("1234567890");
      expect(phoneNumber1.equals(phoneNumber2)).toBe(true);
    });
 
    it("should return false when comparing two PhoneNumber instances with different numbers", () => {
      const phoneNumber1 = new PhoneNumber("1234567890");
      const phoneNumber2 = new PhoneNumber("9876543210");
      expect(phoneNumber1.equals(phoneNumber2)).toBe(false);
    });
  });
 
  describe("toString", () => {
    it("should return the string representation of the PhoneNumber", () => {
      const phoneNumber = new PhoneNumber("1234567890");
      expect(phoneNumber.toString()).toBe("1234567890");
    });
  });
});
MoneyTemperature