public void CommaFormat()
{
string num1 = "1";
string num1result = Formatting.CommaInteger(num1);
Assert.AreEqual("1", num1result);
string num2 = "12";
string num2result = Formatting.CommaInteger(num2);
Assert.AreEqual("12", num2result);
string num3 = "123";
string num3result = Formatting.CommaInteger(num3);
Assert.AreEqual("123", num3result);
string num4 = "1234";
string num4result = Formatting.CommaInteger(num4);
Assert.AreEqual("1,234", num4result);
string num5 = "12345";
string num5result = Formatting.CommaInteger(num5);
Assert.AreEqual("12,345", num5result);
string num6 = "123456";
string num6result = Formatting.CommaInteger(num6);
Assert.AreEqual("123,456", num6result);
string num7 = "1234567";
string num7result = Formatting.CommaInteger(num7);
Assert.AreEqual("1,234,567", num7result);
string num8 = "123456789123456";
string num8result = Formatting.CommaInteger(num8);
Assert.AreEqual("123,456,789,123,456", num8result);
}