public void Two_Telehones_Should_Be_Equal()
        {
            // Arrange
            Telephone telephone1 = new Telephone("Kucni", "123");
            Telephone telephone2 = new Telephone("Kucni", "123");

            // Act
            var areEqual = telephone1.Equals(telephone2);

            // Assert
            Assert.IsTrue(areEqual);
        }