How to pass nodeSelector for deployment config

Hi,

I'm playing a bit with OpenShift - testing it really and let's say I want to configure node independency within the same cluster in a way that live pods are hosted on live nodes, test pods can share live nodes (if resources allow) based on the label. It's not the live example etc, I'm testing on my own VMs at the moment some use cases.
So let's say in the 'potential' cluster I could have 10 nodes whereas 4 out of 10 would have a label 'environment=test'. What I want is to configure deployment and build config that all the builds and pod placements for the desired project will only be deployed to the nodes with label 'environment=test'. Is this achievable at all? I only found solution to configure builds to happen on selected node and deployment for pod to happen by specifying a node hostname so not really something I need.

Thanks!