Minecraft Test Map (15w38b) is a release file of the Minecraft map QMAGNET's Test Map for Resource Packs and Map Makers, made for Minecraft 1.9-Snapshot. It was published on September 26, 2015 and is 10.4 MB in size. For the full description, screenshots and every other version, visit the QMAGNET's Test Map for Resource Packs and Map Makers map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.