Add test script

.circleci/config.yml

@@ -10,5 +10,4 @@ jobs:
             - run: python -m venv env
             - run: env/bin/pip install -e .
             - run: env/bin/pip install -r dev-requirements.txt
-            - run: env/bin/python setup.py test
-            - run: env/bin/black tests ipc_unix
+            - run: ./scripts/test.sh

scripts/test.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+
+set -e
+
+export PATH=env/bin:${PATH}
+
+python setup.py test
+
+black tests ipc_unix