rerun flaky tests

Author: rmorshea

requirements/test.txt

@@ -1,6 +1,7 @@
 pytest==5.2.2
 pytest-asyncio
 pytest-cov
+pytest-rerunfailures
 mypy>=0.750
 black
 flake8

scripts/test.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -e
 
-pytest src/py/tests --headless --cov=idom --cov-fail-under=82
+pytest src/py/tests --headless --cov=idom --cov-fail-under=82 --reruns 3
 black --verbose --check src/py
 flake8 src/py
 mypy src/py/idom