Negative Testing is simple testing the application beyond and below of its limits. For ex: 1)We want to enter a name for that negative test can be first we enter numbers.

2) we wnter some ascii characters and we will check

3)First numbers and characters we will check

4) name should have some minimum length below that we will check

here we test if system is doing something which it is not supposed to do ex in password field we try to enter only alphabets were as in requirement it is specified password should have atleast 1 no if it accepts only alphabets then test case is fail otherwise it's pass.

In negative testing you would test to fail.

eg.If you need to test a name field this should accept only alphabets.

So testing with alphabets is positive testing where it will allow you to enter and accepts alphabets. In negative testing you will test the name field for number symbols alphanumerics to see whether it allows to enter or accept it. It should not allow. This is negative testing

This is a type of testing which is done by tester's to make sure that the system works fine for the Inputs which the code dosen't designed for.