Add unit tests

.gitpod.yml

@@ -0,0 +1,12 @@
+# This configuration file was automatically generated by Gitpod.
+# Please adjust to your needs (see https://www.gitpod.io/docs/config-gitpod-file)
+# and commit this file to your remote git repository to share the goodness with others.
+
+tasks:
+  - init: |-
+      make
+      virtualenv -p /usr/bin/python3 venv
+      source venv/bin/activate
+      pip install -r requirements.txt
+
+