add : test dependencies
add: 1st test
test: earth
add: earth
test: devoxx
add: devoxx
test: drone
add: drone
test: drone position0
add: drone position0
test: drone move 10px
test: drone go back when go max
test: keep back if it's set
test: max on go back go normal
add: drone is alive
add: unit test on interval
implem: unit test on interval
test: behaviour on keydown
add: behaviour on keydown
test: move earth on drone launch