Here you will find the beta version of Black Mesa Research Facility map
Here is the reproduction of Black Mesa Research Facility that has for goal to reproduce some parts of the base in Half-Life 1/Half-Life Black Mesa
Map done for 0.4 (or more recent) version of the mod
You will be able to test a lot of units and structures. Do not hesitate to open the map in the Worldbuilder to see where find Half-Life elements (structures, units, etc...). You can use this map to make your own scenarios.
You will find too on this map a beta version of the Tram System that pass through the base
Extract and place the folder HALF-LIFE BLACK MESA MAP in C:\Users\Documents\Command & Conquer Generals - H Hour Data\Maps