tests: add go-get safety check whilst vgo stuff is in flux

Author: myitcv

_scripts/run_tests.sh

@@ -83,3 +83,8 @@ immutableVet ./...
 # we need to explicitly test the generated test files
 go test myitcv.io/react/cmd/stateGen/_testFiles/
 
+# off the back of https://github.com/myitcv/react/issues/116#issuecomment-380280847
+# ensure that we can go get myitcv.io/react/... in a totally clean environment
+cd `mktemp -d`
+export GOPATH=$PWD
+go get myitcv.io/react/...