When I run my code here it states that I'm missing the assert equal function which I have. What else do I need?

Programming Assignments Programming 21- Unit Tests Programming 21- Unit Tests First Last BlockPy: #21.3) Be Polite Create a function named make polite that takes in a string named message and returns it with ", please added to the end. Test the function by calling it on the following messages: "Pet the dog" and "Walk the dog". Make sure you unit test the function a suitable number of times! Console: Pet the dog, please Walk the dog, please Feedback: Algorithm Error View Trace Unused Variable The variable assert equal was given a value, but was never used after that. Evaluate Run Blocks Split Text S Reset Import datasets Upload History 1 from cisc108 import assert equal 2 def make polite (message): message += ", please" 4 return message 5 print (make polite ("Pet the dog")) 6 print(make polite ("Walk the dog"))