lost spark,how can i test the coil

[markmills2000uk]

hi everyone id just firstly like to thank everyone for the help iv had so far and now ask for some more,
i got the car started for the first time but when i tuned it off it wouldnt turn back on,im not sure why iv lost spark but think it may be the coil,just a guess,so i tested it,with a bulb if i put positive to positive side of the coil the power comes back out the negative side,is this supposed to happen,

[markmills2000uk]

i guess the coils ment to do taht cos it does work,my hand arm and heart verify that,i traced the problem to the lil black pack on the side of the dissy