Really isn't any "checking" to it--remove the ground, clean the wire/cable end to shiny metal, clean the engine/unibody surface to shiny metal, treat with anti-corrosion agent, make the connections tight.
You CAN test the resistance value of a ground wire with an ohm meter, but that might lead to your being fooled--test the resistance, too high, renew the ground, still have a problem because the wire itself is bad.