What is the difference between negative and positive testing?

Positive testing verifies that the system works as expected with correct input data and conditions. Negative testing verifies that the system correctly handles incorrect input data and conditions, preventing failures or undesirable behavior.

Main differences:

Aspect	Positive Testing	Negative Testing
Purpose	Confirming functionality (Happy Path)	Checking error resilience
Input Data	Correct, valid data	Incorrect, invalid data
Expected Result	Successful execution, obtaining the expected result	Error message, proper handling of incorrect data
Test Examples	Entering valid values, performing standard operations	Entering invalid characters, exceeding limits, missing mandatory data

Example:

Imagine an input field "Age".

• Positive test: Enter numbers from 1 to 120. Expect successful saving of the value.
• Negative test: Enter letters, negative numbers, numbers greater than 120. Expect an error message or input rejection.