testBestMatchBigRandom needs to have the test assertion rewritten: if test failed it returns Test failed without providing any feedback.

are you sure you're returning an array of appropriate size? (I bet not).

not an issue: this just means your solution doesn't handle all cases.

edit: on the other hand, if you can extract the exact kind of input that makes fail your code, maybe it can be interesting to add it as fixed test.

After completing a kata and attempting to confirm the completion, I received the following error:

java.lang.AssertionError

at org.junit.Assert.fail(Assert.java:87)
at org.junit.Assert.assertTrue(Assert.java:42)
at org.junit.Assert.assertTrue(Assert.java:53)
at QueensAndKingsTest.testBestMatchBigRandom(QueensAndKingsTest.java:136)(...)

This error occurred when I was trying to confirm the completion of the kata. It appears to be related to a test case in the "QueensAndKingsTest" class, specifically in the "testBestMatchBigRandom" method.

When I attempt to pass the full test suite I get the same error for all the test cases.
I looks like it's a bug in the test class, or some misleading info.

java.lang.ArrayIndexOutOfBoundsException: 1

at QueensAndKingsTest.isOptimalMatch(QueensAndKingsTest.java:163)

at QueensAndKingsTest.testBestMatchSingleSolution(QueensAndKingsTest.java:25)

(…)

Thanks, just fixed.

isOptimalMatch is missing in the sample tests.