Attempting to drag an item from your inventory into the shipyard inventory results in the warning window message
"Cannot move item from this inventory in test sector!"
Dragging items out has no problems.
Shift click moves items into and out without issue.
Procedure:
1. place shipyard and open it by pressing r
2. try to drag any item into the shipyard inventory
Notice the item will not be accepted into the shipyard with the warning window informing you are in a test sector.