Premise:I saw the “`doctest“` code block in README.md via autocompletion in IntelliJ IDEA and was just wondering what does it entail.

Intuition: It helps directly run doctests.

Problem: As there is not play button on the gutter, I was not able to run the doctests.

I tried to run the doctests from the markdown file in shell using the command:

pytest -m doctest -v README.md

And the tests still didn’t run.

My Readme.md file contents:

>>> print('Hello')

This test should fail since there was no string provided for the match.

Question:

1. What is this code-block-markdown of “`doctest“` really for?
2. How to use it to make my document testable?