A test map is better. You can boost the buildspeed, and set the buildtimemultipliers for the buildings, and set all building prereq's to POWER, and set the conyard to be radar, spysat, and an uber oil derrick. Park some battle labs and tech buildings around for spy/engineer stuff. Plenty of money, you 'tech up' only as you need to build what you want. Being able to build everything easily let's you do whatever test your unit/weapon/warhead/artwork/whatever needs without wasting time. And since costs are not screwed with, you also see how easy (or hard) that it is to promote a unit in battle. Keeping the mods confined to the test map means you never take the chance of forgetting to change things back in your mod.
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