How to write a code that can compute and display the loss and accuracy of the trained model on the test set?

I’m rather quite embarrassed recently for flooding this forum
thread with mostly novice questions. I’m still a newbie, still
struggling to figure out how the code works in TensorFlow. Pardon
me for doing that. Is there any template code where I can compute
and display the loss and accuracy of the trained model on the test
set?