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Nishad BashaNishad Basha 

negative test class in salesforce

bob_buzzardbob_buzzard
Care to give us any more clues, or was this just a general statement?
Nishad BashaNishad Basha
give the examples of above scenario
bob_buzzardbob_buzzard
The developer's guide is a good place to start:

https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_testing_example.htm#negative_test_case