public void convertToWordsTestForZero()
{
IConvertNumToWords c1 = ConvertNumToWords.ConvertNumToWords.GetInstance();
string actual = c1.convertToWords(0);
Assert.AreEqual("Zero", actual);
}
public void convertToWordsTestForDoubleDigits()
{
IConvertNumToWords c1 = ConvertNumToWords.ConvertNumToWords.GetInstance();
string actual = c1.convertToWords(11);
Assert.AreEqual("eleven", actual);
}
public void TestForMultipleInstances()
{
IConvertNumToWords c1 = ConvertNumToWords.ConvertNumToWords.GetInstance();
IConvertNumToWords c2 = ConvertNumToWords.ConvertNumToWords.GetInstance();
Assert.IsTrue(c1 == c2);
}
public void convertToWordsTestForNineDigits()
{
IConvertNumToWords c1 = ConvertNumToWords.ConvertNumToWords.GetInstance();
string actual = c1.convertToWords(111111111);
string expected = "eleven crore eleven lakh eleven thousand one hundred and eleven";
Assert.AreEqual(expected, actual);
}
public void convertToWordsTestForNegativeInput()
{
IConvertNumToWords c1 = ConvertNumToWords.ConvertNumToWords.GetInstance();
string actual = c1.convertToWords(-9);
string expected = string.Empty;
Assert.AreEqual(expected, actual);
}
public void convertToWordsTestForMaxLimit()
{
IConvertNumToWords c1 = ConvertNumToWords.ConvertNumToWords.GetInstance();
string actual = c1.convertToWords(999999999);
string expected = "ninety nine crore ninety nine lakh ninety nine thousand nine hundred and ninety nine";
Assert.AreEqual(expected, actual);
}
// checks if instance is available or not - follows singleton design pattern
public static IConvertNumToWords GetInstance()
{
//The block inside the lock ensures that only one thread enters this block at any given time.
lock (padlock){
if (_instance == null)
{
_instance = new ConvertNumToWords();
return(_instance);
}
return(_instance);
}
}
static void Main()
{
// long handles upto 9 digit no
// change to unsigned long long int to
// handle more digit number
Console.WriteLine("Please Enter a positive number");
long num = long.Parse(Console.ReadLine());
//singleton pattern
IConvertNumToWords c1 = ConvertNumToWords.GetInstance();
//Console.WriteLine(c1.convertToWords(n1));
Console.WriteLine(c1.convertToWords(num));
//Implemenet using extension methods for long type
// Console.WriteLine(n1.convertToWords());
// convert given number in words
Console.WriteLine("Press any key to exist.");
Console.ReadLine();
}
