-ve cases means giving manual interuption 
Eg. If Perform Backup process from USB to HDD during the process Remove the 
USB.
+ve cases means should check the basic or expected A+B should produce C 
make sure A+B is not produced D.

Hai this is sunithayagnamurthy


+ve testing means to test the functionality testing.the
functionality is working or not as per the customer requirement

For ex: we will take yahoomail: first we login with valid
user name & password It should login into and click to the
in box .it should display all the newmessges  & old messges
This is the functionality testing
 -ve testing means it test cosmotic bugs alertmessges and etc.
       for ex: enter valid userid & inavalid password.
    it should display the alert message.this is the
newgitive testing
If any mistake is thr plaz excuse

We can  test the application for Negative testing  by 
giving the  invalid inputs...
for example in order to testing pin for ATM it only accepts 
4 lettered PIN...try giving 3 lettered  or 5-lettered....  
all zeroes and so on........the process of doing this is 
called negative testing

Positive test case and negative test case

For example the user tests the login screen using valid 
user name and valid password .it is called positive test 
case
The user tests the login screen using invalid user name and 
invalid password .it is called negative test case

actualResult and expected result both are same that is 
called +ve testcase.
actualResult and expected result both are different that is 
called -ve testcase.