Configure tests as a module.

.gitignore

@@ -1 +1,2 @@
 /.env
+/config/.ipynb_checkpoints/

.idea/straw2analysis.iml

@@ -2,7 +2,7 @@
 <module type="PYTHON_MODULE" version="4">
   <component name="NewModuleRootManager">
     <content url="file://$MODULE_DIR$" />
-    <orderEntry type="inheritedJdk" />
+    <orderEntry type="jdk" jdkName="Python 3.9 (straw2analysis)" jdkType="Python SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
 </module>

test/__init__.py

@@ -0,0 +1,4 @@
+from unittest import main
+
+if __name__ == "__main__":
+    main(module="test", verbosity=2)

test/test_config.py

@@ -1,5 +1,6 @@
-import unittest
 import os
+import unittest
+
 from dotenv import load_dotenv
 
 load_dotenv()