Good morning, you must change the capacitor and fuses and verify the diode, you should only measure between the magnetron terminals a very low continuity and then between the metal part and the terminals there should be no continuity. There is no test to determine if the magnetron is issuing, unless you try it on another good machine and if it is an inverter it must be the same, or in another one you try with another magnetron of the same characteristics, magnetron continuity tests are only for establish if the magnetron has a crossing or not, greetings.