You can also use the test credit card number:
Test MasterCard Number for Verification and Validation : 5105105105105100
Test Visa Card Number for Verification and Validation:
4111111111111111
Test American Express Number for Verification:
378282246310005
Test Diner's Club Number for Verification and Validation:
38520000023237
Test Discover Card Number for Verification and Validation:
6011111111111117
Test JCB Card Number for Verification and Validation:
3530111333300000