client: add another test for the QuadTree

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
client: insert() returns a boolean

Reviewed-by: Jean-François Erdelyi <jean-francois.erdelyi@etu.iut-tlse3.fr>
Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>