gnomeExtensions: Add unit tests and development instructions

#!/usr/bin/env nix-shell

#!nix-shell -I nixpkgs=../../../.. -i python3 -p python3

### After making change:

### - Format the script by running: nix run nixpkgs#black pkgs/desktops/gnome/extensions/update-extensions.py

### - Run the unit test by running: python3 -m unittest pkgs/desktops/gnome/extensions/update-extensions.py

### - Run the type checking by running: nix run nixpkgs#mypy pkgs/desktops/gnome/extensions/update-extensions.py

import base64

import json

import logging

import argparse

import unittest

import subprocess

import urllib.error

import urllib.request

if __name__ == "__main__":

    main()

class FindCollisions(unittest.TestCase):

    extensions = [

        {

            "pname": "foo",

            "uuid": "foo_38_to_40@doe.example",

            "shell_version_map": {

                "38": {},

                "40": {},

            },

        },

        {

            "pname": "bar",

            "uuid": "bar_42_to_45@chulsoo.example",

            "shell_version_map": {

                "42": {},

                "43": {},

                "44": {},

                "45": {},

            },

        },

        {

            "pname": "bar",

            "uuid": "bar_44_to_47@younghee.example",

            "shell_version_map": {

                "44": {},

                "45": {},

                "46": {},

                "47": {},

            },

        },

    ]

    def test_no_collision(self) -> None:

        self.assertEqual(

            {},

            find_collisions(self.extensions, ["40", "41", "42"]),

        )

    def test_collision(self) -> None:

        self.assertEqual(

            {

                "bar": [

                    "bar_42_to_45@chulsoo.example",

                    "bar_44_to_47@younghee.example",

                ],

            },

            find_collisions(self.extensions, ["45", "46", "47"]),

        )