public void NumbersThatContainsNumber()
{
//Arrange
ContactInfo contactInfo = new ContactInfo();
PhoneNumber phoneNumber1 = new PhoneNumber("000000000");
PhoneNumber phoneNumber2 = new PhoneNumber("123123132");
PhoneNumber phoneNumber3 = new PhoneNumber("456456465456");
contactInfo.AddPhoneNumber(phoneNumber1);
contactInfo.AddPhoneNumber(phoneNumber2);
contactInfo.AddPhoneNumber(phoneNumber3);
//Act
PhoneNumber[] result = contactInfo.FindPhoneNumberContaning("12");
//Assert
Assert.True(result.Length == 1);
Assert.Equal(phoneNumber2, result[0]);
}