You are not testing for anything.

No random tests

Also, it legit tells you what to do, so that you can copy and paste it and still pass. Should use test.assert_equals

mmh, I forgot about that subtlety. You didn't pay enough attention to this requirement:

You only count each defeated enemy once, even if it is hit by more than one laser.

(edit: seems I'm a little late... x) )

You are right! Thank you!

And there's 2 Bs and Ds on the map, and they're both hit, so it's all correct.

+----------+
|>A B<|
| / D |
| D B | => All enemies are defeated: ['A', 'B', 'B', 'D', 'D'] (Notice the repeated enemies)
| |
|\ < > /|
+----------+

They're different objects, but they can have the same ID.

Are you sure? Because there are many tests with double strike like this:

+------+
| C |
|v A A|
| |
|\ <|
+------+
['A', 'C'] should equal ['A', 'A', 'C']

you don't care about the number of hits. Just the targets that have been hit.

m = [
'AvB',
'>E<',
'C^D'
]

test_case(m, ['A', 'B', 'C', 'D', 'E'])

Maybe "E" must be hit 4 times here?

I think this kata also should have a tag 'game' since It's game-ish and fun