property-based testing framework: I found an edge case! makes the test fail!

me: ok go on

framework: I made a house with 67 energy saving light bulbs : - )

me: that doesn't seem *too* unreasonable. how many light bulbs where there in total?

framework: minus one : - ))

remembering the time I was getting a (vegan of course) milkshake and the menu said you could mix and match flavours if you wanted,

so I said: "up to how many flavours can you have?"
milkshake associate: "dunno... as many as you want?"
me: "...can I have all of them?"
them: "you can have up to 3."

I should have followed it up with can I have an empty set flavour milkshake