Habits of Highly Effective Negative Testers

1) First check if all the tabs, menus and links are displaying proper pages
2) Put negative numbers into text fields
3) Put ridiculously long strings anywhere you can,
4) Paste inappropriate stuff - like binary files into text boxes
5) Open 13 instances of your app at once
6) Unplug the network or the power in the middle of an important flow
7) Change the system date and time
8) Install on a system way below the minimum specs
9) Use weird characters like ì È Ö
10) Run 10 other apps while you are testing
11) Delete crucial files
12) Don't close other applications before proceeding
13) Press submit button in all the forms for more than one time and see
the application response
14) Try to login with case sensitive passwords
15) Close your Browser while doing any uploading or submitting in the application
16) Test with low bandwidth networks
17) Change the parameter id’s displayed in the URL
18) View for Application icon in browser address bar
19) Check with the displayed error messages through out the application
20) Check whether the user can find on which page he is now (i-e) Application
have to highlight the current page