Final answer:
General Francisco Franco tested the new weapons on the Republicans during the Spanish Civil War.
Step-by-step explanation:
During the Spanish Civil War, General Francisco Franco tested the new weapons on the opposition forces, also known as the Republicans. The Republicans were those who opposed the fascist regime that Franco sought to establish. With support from Nazi Germany and Fascist Italy, Franco's forces were able to prevail and establish a fascist dictatorship in Spain.