Dear Tatiana,
Being in an emotionally and physically mature relationship there is never a time when it is appropriate to "test" our partner.  The act of testing our partner is a personal red flag.  This usually means that we have trust or intimacy issues that we are bringing into the relationship.  These types of issues will not be resolved by testing our partner. In fact, testing our partner will usually make these issues worse.  The best action to take is to address and heal these issues, as they will not just magically go away and will follow us into every relationship we are in until they are resolved.