{"Persepolis"=>14, "Adults in the Room"=>11}
["Noughts & Crosses x10",
 "ts x7",
 "immortal",
 "tur x4",
 "nothing x2",
 "persepolis x10",
 "thwae",
 "tdc",
 "The Hare with Amber Eyes",
 "Outline by Rachel",
 "thwae",
 "tgd"]
expected: {"Adults in the Room"=>11, "Persepolis"=>14}
     got: {"Adults in the Room"=>11, "Persepolis"=>4}

(compared using ==)

Diff:
@@ -1,3 +1,3 @@
 "Adults in the Room" => 11,
-"Persepolis" => 14,
+"Persepolis" => 4,

The catalog needs 14 Persepolis.

However, in the inventory notes, there is "persepolis x10"

Why does the reference solution expect 14 Persepolis? There are 10 Persepolis in the inventory.

Errors from the random tests:

In file included from main.cpp:7:
./tests.cpp:37:23: error: use of undeclared identifier 'multiply'; did you mean '_multiply'?
        string temp = multiply(a, mul);
                      ^~~~~~~~
                      _multiply
./tests.cpp:21:8: note: '_multiply' declared here
string _multiply(string x, int mul) {
       ^
./tests.cpp:39:18: error: use of undeclared identifier 'add'; did you mean '_add'?
        result = add(result, temp);
                 ^~~
                 _add
./tests.cpp:8:8: note: '_add' declared here
string _add(string x, string y) {

"abcccabab"       3

Why is the expected result 3?

If the index is zero-based, then 3 would be the second 'c' instead of the first 'c'.

Random tests always seem to expect Diamond?

Does not award the correct statuette: 'Crystal' should equal 'Diamond'
Does not award the correct statuette: 'Bronze' should equal 'Diamond'
Does not award the correct statuette: 'Crystal' should equal 'Diamond'
Does not award the correct statuette: 'Silver' should equal 'Diamond'
Does not award the correct statuette: 'Silver' should equal 'Diamond'
Does not award the correct statuette: None should equal 'Diamond'
Does not award the correct statuette: 'Crystal' should equal 'Diamond'
Does not award the correct statuette: 'Silver' should equal 'Diamond'
Does not award the correct statuette: 'Silver' should equal 'Diamond'
Does not award the correct statuette: 'Crystal' should equal 'Diamond'

I may need a bigger hint. LOL

What exactly was being tested here??

Test Failed
  Expected: True
  But was:  False

test.assert_equals(makeFraction(.523681), (428417670197443, 818088190672896))

Why isn't the answer (523681, 999999)? That would produce the desired repeating decimal.

n: 179164078, score: 41130371602715017, expected: 25080488090337936: 25080488090337935 should equal 2.5080488090337936e+16

Why is the reference solution using floating point math when an exact integer solution is possible?

Fix the random tests to invalidate this solution:

https://www.codewars.com/kata/reviews/66bce4158fed1ddb86d680b7/groups/66bcef7d8fed1ddb86d68228

This issue was corrected for the fixed tests but random tests still aren't testing anything.

For this "solution":

def problem(area):
    return 1

I got this result:

Random tests
Test Passed
Test Passed
Test Passed
Test Passed
Test Passed
Test Passed

Also https://www.codewars.com/kata/reviews/66bce4158fed1ddb86d680b7/groups/66bcea6e8fed1ddb86d6818b

The tests aren't testing anything.

I made a mistake in this solution but still passed: https://www.codewars.com/kata/reviews/66bce4158fed1ddb86d680b7/groups/66bce9654a6f487c43156bc3

Some of the edge cases may need explanation.

When the cathetus is equal to the hypotenuse, that could mean that the "other side" of the right triangles is zero, so the four right triangles are all zero-area. Then the inner square is equal in area to hypotenuse ** 2.

But the edge case tests expect 0 for the result. Why?

Still see the following in the desc:

Ensure that both a and b are always non-negative numbers.

The question remains though. Which line or line segment do you mean by "cathetus"? It could be the shorter leg or the longer leg or maybe it doesn't matter. That is unclear.