Friend just trying to look out for her. Like this "testing" is more that he doesn't have any ulterior motives and isn't you know.. taking advantage of her, especially since her friend is kinda dense. Yeah in some ways, it's none of her friend's business but I see where she's coming from that she just wants to look out for her.
And no, she's not trying to freaking monopolize her time with her like other typical jealous friend characters, she's legitimately looking out and observing the guy, if that was the case, she would constantly ask the girl to come along with her and get between the guy and girl whenever they had a moment or something. She did not do any of those things. She was just actively observing the guy and seeing for who he is. Which she did reach the correct conclusion; he's as pure and dense as they come, "the guy who would get lost trying to find a seat in the food court". And she even berates herself for being an idiot for having such suspicions. Guys, I have to say, she's a good friend character. This is how you do a good friend character that just wants the best for her friend. (Not the jealousy characters we see in mangas like Binetsu Kuukan or even worse Cheehoe from Hataraku Maou-sama) I hope she stays as a sort of wingman to these two, especially after finding out how pure they are~
And I hope Takada makes his appearance soon
I want to see his friend who's always got MC's back! Especially after giving us a sneak peek on how they met
Damn Takada please come already!