Summary: Units responded to a commercial fire alarm at a metal warehouse facility, reported as 4-2-South Level Homeowner, possibly located at or near East South Oklahoma in Collin County, Texas. Initial reports indicated smoke or flames visible from the structure, but no audible alarms were present. Upon investigation, it was determined that the building was still under construction and a fire alarm test had been performed the previous week. The alarm system was reset, no hazards were found, and all units were cleared to return to service.