It would seem like I have finished the calculator project for the Front-end libraries certificate. When I test it manually, my calculator produces all of the correct answers.
10.5 - 5.5 = 5
For some reason, however, 5/16 unit tests still return assertion errors despite the manual use of my calculator producing the correct answer in all 5 of those cases.
What could be going wrong? For reference, here is my GitHub repo for this project.