Business Definition: This is a term in software quality assurance, used to describe a test scenario where the tester inputs data values that should be invalid, i.e., using 11 characters in a field where only 10 characters is allowed, to see if the application responds the way it should when experiencing invalid data inputs. Negative testing is also referred to as failure testing or error path testing. Technical Definition: A method of testing an application or system that ensures that the plot of an application is according to the requirements and can handle the unwanted input and user behavior. Invalid data is inserted to compare the output against the given input. Negative testing is also known as failure testing or error path testing.