Positive testing and Negative testing: The application tested from positive attitude than it become positive testing in another way the testing with negative attitude than it becomes negative testing.

Example of positive testing is given below:
Employee name requirements is characters, and whenever we check the application by giving alphabet characters on name field than it is positive testing, because we test the application with reasonable input.

Example of negative testing is given below:
Employee name requirements is characters, and whenever we check the application by giving numeric and special characters on name filed than it is negative testing, because we test the application with unreasonable input.

Conclusion: - As per tester point of view both are required simultaneously.