public void ConvertHigherDigits_ReturnNumber()
{
NumberToWord n2w;
n2w = new NumberToWord("0");
Assert.AreEqual("one hundred twenty-three", n2w.ConvertHundred("123"));
Assert.AreEqual("one hundred", n2w.ConvertHundred("100"));
Assert.AreEqual("one hundred one", n2w.ConvertHundred("101"));
Assert.AreEqual("one hundred ten", n2w.ConvertHundred("110"));
Assert.AreEqual("one", n2w.ConvertHundred("1"));
Assert.AreEqual("ten", n2w.ConvertHundred("10"));
}