You can check the 10R resistor using a common Ohmmeter, I suppose it'll apply a rather low current (like 1mA to 10mA). So the voltage across the resistor stays well below the diode forward voltage.
For testing the diode, you could apply a constant current of 100mA that would cause 1V drop across the resistor. With diode in parallel, the voltage drop will be lower, approximately the diode forward voltage at 60mA ... 70mA (0.6V ... 0.7V).