slew rate and power output.

No, since you'll have to observe when the clipping of the sinewave occures. What you'll need is a sinewave-generator, an osciloscope and a loadresistor, preferably on a heatsink.

Slewrate expresses the ability to respont to an input, and is limited by any capacitance, such as Miller- and straycapacitance, and any kind of frequency compensation. Please correct me if I've missed something.
To meassure slew-rate, you'll need all of the above mentioned. Slew-rate is meassured at full output, and you can start at say 1kHz, and then raise the frequency till the sinewave at the output is distorted. Then the slew-rate is calculated using the equation : SR = 2*PI*U(peak)*f, where f is the frequency where the distortion occured, and U(peak) is the maximum voltageswing. The latter is NOT always equal to Max voltageswing at 1kHz, due to possible bandwidth-limitation.
I hope this will answer your question.