No output for N-Channel MOSFET on PWM on STM32F0
So this is a dual MOSFET designed for battery protection, not really for general-purpose use because the drains are connected together internally.
When PA4 or PA6 is high then 'R' and 'G' should show continuity to ground (they are connected together internally.
When PA7 is high, then 'B' should show continuity to ground.
If you were, say, to connect an LED to a supply through a resistor to each of 'R', 'G', and 'B', then 'R' and 'G' would go off and on together.