Copied! This is the exact case in point I Utilized in an previously section to mention functionality composition. It fundamentally permits substituting print() using a customized function of precisely the same interface. To examine if it prints the appropriate message, you have to intercept it by injecting a mocked operate: https://get-social-now.com/story3885122/the-smart-trick-of-print-server-that-no-one-is-discussing