[WIP] Monkeypatch tests (#448)

* Parameterize test_internals.py

* Create test_spotify_tools.py

* Monkeypatch pafy.download

* Monkeypatch YouTube search page

* Replace globals with fixtures

* Add missing urllib import, re-ordering and rename test_with_metadata.py

* Avoid creating temp directory in current working directory during test

* Update CHANGES.md

spotdl/handle.py

@@ -1,14 +1,14 @@
-import appdirs
-from spotdl import internals
 from logzero import logger as log
+import appdirs
 
 import logging
 import yaml
 import argparse
 import mimetypes
-
 import os
 
+from spotdl import internals
+
 
 _LOG_LEVELS_STR = ["INFO", "WARNING", "ERROR", "DEBUG"]