jkff_tt run with jkff_tt.run  output by puts
 should be reset
q= 1, q_= 1, j= 1, k= 1
should be set
q= 0, q_= 0, j= 1, k= 1
should be reset by k=1, j=0
q= 0, q_= 1, j= 0, k= 1
should be set by j=1, k=0
q= 1, q_= 0, j= 1, k= 0
should stay the same, j=1, k=1
q= 1, q_= 1, j= 1, k= 1
should still stay same
q= 1, q_= 1, j= 1, k= 1
both j=0 and k=0
q= 0, q_= 0, j= 0, k= 0
no change on inputs
q= 0, q_= 0, j= 0, k= 0