Licensing SQL Server 2012 Standard Edition for development and test severs [closed]

Question

Is there an economic way to license SQL Server standard edition on a test server?

Given the following environment:

• live: SQL Server 2012 Standard Edition
• test: SQL Server 2012 Developer edition
• dev: SQL Server 2012 Developer edition

The problem with this scenario is that a developer could code using a feature that works in developer edition, but is not available when deployed to the live server. The client would be the first to discover the problem!

Thoughts:

• Host test database on live server?
  • Doesn't give the live/test isolation I would like
  • Uses live server resource (buffers, CPU, etc.)
  • (Could disconnect test database when not in use to minimise this)
• Run a second database instance on the live server
  • Still poor live/test isolation
  • More processes using server RAM/CPU