Easiest way to find out may be to start with the controller, using some type of external source [even 3x 1.5v batteries for 4.5v] to physically apply 5v to the step input [other source disconnected], and the stepper 'should' move..
to check pulse coming in a led with ??10k resistor should give a visible pulse indication off the step or direction lines in to the controller..
just my 3 cents worth [inflation]
enjoy..it's just a hobby..