how can ifix my front load washing machine.frigidaire,model#gltf1240aso?

i have a washing machine that fill with water but motor wont run.when i try to set it for drain .it will drain but it wont stop humming.its kinda stock on drain position.thats on final spin.it doesnt matter what setting i did,there is no movement in the motor.it fill with water,it drains but not washing and motor is no movement.model#gltf1240aso.its frigidaire.7 years old.whats wrong with it.i suspect its the motor.how can i test it before i buy parts.