test(lua): add justification API tests
test(lua): add justification API tests

Signed-off-by: Leonardo de Moura <7610bae85f2b530654cc716772f1fe653373e892@microsoft.com>

leodemoura/lean,sp3ctum/lean,Kha/lean,rlewis1988/lean,soonhokong/lean-windows,c-cube/lean,digama0/lean,soonhokong/lean,rlewis1988/lean,fpvandoorn/lean,UlrikBuchholtz/lean,leanprover-community/lean,sp3ctum/lean,soonhokong/travis_test,fpvandoorn/lean2,leanprover/lean,digama0/lean,Kha/lean,levnach/lean,htzh/lean,dselsam/lean,dselsam/lean,soonhokong/travis_test,fpvandoorn/lean2,digama0/lean,Kha/lean,soonhokong/lean,leodemoura/lean,Kha/lean,soonhokong/travis_test,fpvandoorn/lean2,johoelzl/lean,fgdorais/lean,soonhokong/lean,eigengrau/lean,fpvandoorn/lean,levnach/lean,johoelzl/lean,levnach/lean,sp3ctum/lean,dselsam/lean,javra/lean,htzh/lean,soonhokong/lean-osx,htzh/lean,c-cube/lean,eigengrau/lean,javra/lean,fpvandoorn/lean2,leanprover/lean,levnach/lean,rlewis1988/lean,soonhokong/lean-osx,UlrikBuchholtz/lean,leanprover-community/lean,rlewis1988/lean,Kha/lean,eigengrau/lean,soonhokong/travis_test,leodemoura/lean,sp3ctum/lean,levnach/lean,dselsam/lean,sp3ctum/lean,UlrikBuchholtz/lean,avigad/lean,johoelzl/lean,soonhokong/lean-windows,soonhokong/lean,leodemoura/lean,digama0/lean,htzh/lean,leanprover/lean,soonhokong/lean-windows,htzh/lean,leanprover/lean,Kha/lean,soonhokong/lean-windows,fgdorais/lean,leanprover-community/lean,fpvandoorn/lean,digama0/lean,soonhokong/lean-osx,fgdorais/lean,fpvandoorn/lean,fpvandoorn/lean,fgdorais/lean,c-cube/lean,javra/lean,leanprover-community/lean,rlewis1988/lean,soonhokong/lean,digama0/lean,soonhokong/lean-osx,johoelzl/lean,c-cube/lean,dselsam/lean,avigad/lean,fpvandoorn/lean,javra/lean,soonhokong/lean-windows,leodemoura/lean,leanprover/lean,UlrikBuchholtz/lean,leanprover/lean,fpvandoorn/lean2,leanprover-community/lean,johoelzl/lean,c-cube/lean,fgdorais/lean,UlrikBuchholtz/lean,avigad/lean,avigad/lean,avigad/lean,johoelzl/lean,avigad/lean,javra/lean,soonhokong/lean-osx,leanprover-community/lean,eigengrau/lean,leodemoura/lean,dselsam/lean,rlewis1988/lean,eigengrau/lean,fgdorais/lean