And don't forget to get the loaded parameters too, as this is the most important. Making curves of speed vs. load will enable you to find the sweet spot where its max. efficiency lies.
If you increase voltage by eg. 5% each step and then wait until the temperature has stabilized, up to a temp of say 40..45°C outside casing with each amount of load (increase load at each attempt a similar amount).
Stall torque can be measured by using a wide "wheel", with an outside dimension of eg. 2" (precisely). Mount a piece of string on it and let the wheel outside a table edge. Add weight to the other end of the string until the motor can hold it, but not lift it further.
If the weight is 2.3 ounce and the wheel has a radius of one inch, the stall torque is 2.3 ozf-in and the stall current should be measured with the same setup, but do it quickly, don't have this magnitude of current going through the motor for long, to avoid burning the windings.
A Lab PSU with adjustable current limiting is the best supply for this.