Best way is the resonance test, choose a good quality, hi Q, cap, say 470nF 400V ( but can be any good quality cap )
solder in parallel with the terminals to be measured ( for Lpri-leak across the pri with the sec's shorted )
put a 4k7 resistor in series with this combo
hook up to a sig gen, with a scope on the sig gen o/p and a 100x probe across the LC parallel ckt
vary the freq until you see the resonant rise across the LC and it is in phase with the sig gen volts out
Ckt now at resonance - you know C, and F, hence L = 1/ (( 2.pi.F)^2 . C )
p.s. this is a very accurate test, and can be done at any freq of interest by choosing C
Also if you measure the 3dB points either side of resonance ( Vpk x 0.707 ) you can measure the Q accurately ( Q = Fr /( Fhi - Flow) ) - but bump the R up to 47k and make sure the Q of the cap is > 600 ....
happy measuring ...
p.s. once you know Lpri, by the same method ( unshort the sec's ) you can then take the freq way up until you get the SRF, then you can calc the capacitance of the pri easily at you know Lpri & the SRF ...