ok,my bad. i was transforming list to a set.

a1 = [2, 2, 3]
a2 = [4, 9, 9]
test.assert_equals(comp(a1, a2), False)
a1 = [2, 2, 3]
a2 = [4, 4, 9]
test.assert_equals(comp(a1, a2), True)

Each element counts, repeating or not. If you remove repetitions, then sure - they're "same".. But it doesn't say anywhere in description to do so, so your approach will be incorrect.

10-th and 11-th test in fixed test in Attempt?

They haven't the same input values and both tests expect different output. Nothing wrong with that.

or 10 and 11. [2,3] and [9,4] is repeated 2 times

That's just not true. Look at the inputs again, carefully. There's at least 1 different number.

The test 9 and 10 in the fixed tests have the same input but diffrent output. If you return arrray1 and array2 you can clearly see that.

Then please accept my apologies :-) I am kind of new here...

Correct. Maybe BASIC TESTS in 'attempt' mode has more tests than you see in 'test' mode.

Are you saying that the BASIC TESTS when pressing Attemp is not the same as the BASIC TESTS you get when you click Test?

Nothing broken. When you press "Attempt" there are many more tests.

This one seems broken, when I enter my solution and press Test, it passes the basic tests, but when I press Attempt it fails ON THE BASIC TESTS, that it just passed.