tests: run tests concurrently

README.md

@@ -24,3 +24,16 @@ With the "/generate-invite" command,
 you can also generate an invite link for the bot
 so you can publish it.
 
+## Contribute
+
+Pull Requests are very welcome!
+
+To run the tests and lint checks:
+
+```
+python3 -m venv venv
+. venv/bin/activate
+pip install -e .[dev]
+tox
+```
+

setup.cfg

@@ -33,6 +33,7 @@ console_scripts =
 [options.extras_require]
 dev =
     pytest
+    pytest-xdist
     tox
     black
 
@@ -50,8 +51,9 @@ commands =
 [testenv]
 deps =
     pytest
+    pytest-xdist
 commands =
-    pytest tests
+    pytest -n2 tests
 
 [flake8]
 max_line_length = 120