Fully vet the setup.py requirements and installed code during cibuild

script/cibuild

@@ -1,4 +1,5 @@
 #!/bin/sh
+
 set -e
 
 cd "$(dirname "$0")/.."
@@ -27,4 +28,15 @@ echo "## tests/coverage ########################################################
 script/coverage
 echo "## validate setup.py build #####################################################"
 python setup.py build
+echo "## validate setup.py install ###################################################"
+deactivate
+TMP_DIR=$(mktemp -d -t ci-XXXXXXXXXX)
+python3 -m venv $TMP_DIR
+source "$TMP_DIR/bin/activate"
+python setup.py install
+octodns-sync --help
+echo "## validate tests can run against installed code ###############################"
+pip install .[dev]
+cd $TMP_DIR
+pytest --disable-network
 echo "## complete ####################################################################"