added

Then let's improve test cases, so that other users won't have to go through this ordeal.

That can still refer to either those neighbours or the target room.

I'm sorry my kata's bore you. I'll try to do better next time.

I'm just going to draw a visualisation in the description of this 3th rule, to remove any ambigouty.

Oh, I see. That's right.

Yes, but one could sort numerical or string-based and you'd only find out on submit.

But the description says "Output: A list of strings representing "suspicious" apartments in the format room number based on the criteria outlined below, ordered by ascending room number."

You are right, this is a good test of the ordering of results. Working on it.

ok Ciprian's suggestion is the best I can think of, with examples included. Unless people start thinking this only applies to these 3 fixed apartment xD. What kind of rabbit hole did we dive into!

At least two neighbouring apartments toggled lights four or more times during the night(4C and 4E), while the occupant(4D) of the apartment in question wasn't consistently in sight that night.

4D starts lights off, not in sight (value 0)

Uh 4E, where did you get that from?

expected [ '1B', '3B', '3E' ] to deeply equal [ '1B', '3B', '3E', '4D' ]

Bur for choosing 4D as suspicious, the two neighbours (in this case 4E and 4C) don't have to be suspicious. They just need to toggle lights at least 4 times. The occupant refers to 4D, not to 4E and 4C.

• Ok I'll think about how te rephrase this in a clear and concise enough way.
• EDIT: updated to -> At least two neighbouring apartments toggled lights four or more times during the night, while the occupant of the apartment in question wasn't consistently visible through the window that night

• You are right about the inconsistent use of "present" and "visible". I should not talk about "Person present", instead I should mention "Person in sight". I'll change description.
• About "who is the occupant" .. I think it should be clear that I mentioned "At least two neighbouring apartments", so the occupant is the one with neighbouring apartments.