Testing of CAPTCHA

What is a CAPTCHA?

CAPTCHA is distorted text .It is challenge response test and that response need to be generated by human.Captcha comes in many shape and size.

Full form of CAPTCHA:  Completely Automated Public Turing Test To Tell Computers and Humans Apart.

Why Captcha is important for any web site?
1. Captcha gives protection for the website registration.

2. Captcha Protect and prevent from spam comment.

3. Captcha Prevent the bots illegal access to any website.

4. Captcha satisfy main issue like security and accessibility.

5. In online poll Captcha allows human only to vote.

6. Using Captcha it is possible to protect emails from worm and spam by insuring the sender is human not bots.

How to test Captcha?
1. Every refresh of a webpage should display new Captcha.

2. Captcha image of text should be distorted text.

3. Captcha need to be Combination of alpha-numeric character, upper and lower case.

4. There should be client side validation which displays the error message when submitting form without entering the Captcha.

5.Check the Captcha entry it should be case sensitive.

6.Captcha need to be refreshed for wrong entry.

7.Need to be done server side validation for Captcha.

8.Need to be test audio support if the website is supported for blind end-user.