1. A method, comprising: mapping, by a processing device, multiple tiers of a PaaS system to a consolidated environment executable on a virtual machine (VM), wherein networking stacks of the VM maintain a separation between the multiple tiers in the consolidated environment; and providing, by the processing device, the e consolidated environment as a development instance of the PaaS system for execution on the VM, the consolidated environment facilitating testing of code changes to the PaaS system.