Add a test.sh script that runs all tests

Author: lhchavez

test.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+yarn test
+
+# TODO: Rename all directories so that they are valid Python module names,
+# which should make it possible to run unittest in Discovery mode.
+find Python -name '*.py' -print0 | xargs -0 -n 1 python3