For some test data, use can use the mortgage calculator 
on this web page:

http://www.bankrate.com/calculators/mortgages/mortgage-calculator.aspx


Here are a few test cases 
(the same results you get from the web page above)

Amount   years   interest rate (%)    monthly payment
145000   30       4.50                 734.69
 75000   15       8.72                 748.26          
245100   20       7.13                1919.43
 97025   10       3.82                 974.05
100000   17      12.00                1151.22