Thank you, it was really a great Kata!

The tests for preconditions were annoying, though. I'd prefer no invalid inputs in the big test cases.

Thanks, for some reason I was assuming straight directions only.

This was the real input during the random test:

int[] image_data = {
                6,6,6,6,6,7,5,5,5,5,5,5,5,5,7,7,7,7,5,7,6,6,6,6,6,7,7,6,7,
                6,6,6,6,6,7,5,5,5,5,5,5,5,5,7,7,7,7,5,7,6,6,6,6,6,7,7,6,7,
                6,6,6,6,6,7,5,5,5,5,5,5,5,5,7,7,7,7,5,7,6,6,6,6,6,7,7,6,7,
                7,7,7,6,5,5,7,7,7,7,7,7,7,7,5,5,5,5,6,7,6,6,6,6,6,6,6,7,7,
                7,7,7,6,5,5,7,7,7,7,7,7,7,7,5,5,5,5,6,7,6,6,6,6,6,6,6,7,7,
                7,7,7,6,5,5,7,7,7,7,7,7,7,7,5,5,5,5,6,7,6,6,6,6,6,6,6,7,7,
                7,7,7,6,5,5,7,7,7,7,7,7,7,7,5,5,5,5,6,7,6,6,6,6,6,6,6,7,7,
                7,7,7,7,7,7,7,7,7,7,7,7,7,7,6,6,6,6,7,6,6,6,6,6,6,7,7,6,7,
                7,7,7,7,7,7,7,7,7,7,7,7,7,7,6,6,6,6,7,6,6,6,6,6,6,7,7,6,7,
                6,6,6,7,5,5,7,7,7,7,5,5,5,5,6,6,6,6,7,6,6,6,6,6,6,5,5,7,7,
                6,6,6,7,5,5,7,7,7,7,5,5,5,5,6,6,6,6,7,6,6,6,6,6,6,5,5,7,7,
                6,6,6,7,5,5,7,7,7,7,5,5,5,5,6,6,6,6,7,6,6,6,6,6,6,5,5,7,7,
                6,6,6,7,5,5,7,7,7,7,5,5,5,5,6,6,6,6,7,6,6,6,6,6,6,5,5,7,7,
                6,6,6,7,5,5,7,7,7,7,5,5,5,5,6,6,6,6,7,6,6,6,6,6,6,5,5,7,7,
                6,6,6,7,7,7,6,6,6,6,5,5,5,5,7,7,7,7,7,7,6,6,6,6,6,6,6,5,5,
                6,6,6,7,7,6,6,6,6,6,7,7,7,7,7,7,7,7,5,6,7,7,7,7,7,5,5,5,6,
                6,6,6,7,7,6,6,6,6,6,7,7,7,7,7,7,7,7,5,6,7,7,7,7,7,5,5,5,6,
                6,6,6,7,7,6,6,6,6,6,7,7,7,7,7,7,7,7,5,6,7,7,7,7,7,5,5,5,6,
                6,6,6,7,7,6,6,6,6,6,7,7,7,7,7,7,7,7,5,6,7,7,7,7,7,5,5,5,6,
                6,6,6,7,6,5,6,6,6,6,5,5,5,5,7,7,7,7,7,7,5,5,5,5,5,6,6,5,6,
                7,7,7,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,5,5,5,5,5,5,5,6,5,
                7,7,7,5,5,5,5,5,5,5,5,5,5,5,6,6,6,6,6,6,5,5,5,5,5,5,5,6,5,
                5,5,5,7,5,7,6,6,6,6,5,5,5,5,6,6,6,6,6,7,6,6,6,6,6,6,6,5,5,
                5,5,5,7,5,7,6,6,6,6,5,5,5,5,6,6,6,6,6,7,6,6,6,6,6,6,6,5,5,
                5,5,5,7,5,7,6,6,6,6,5,5,5,5,6,6,6,6,6,7,6,6,6,6,6,6,6,5,5,
                6,6,6,7,7,6,6,6,6,6,6,6,6,6,5,5,5,5,6,6,6,6,6,6,6,7,7,5,5,
                6,6,6,7,7,6,6,6,6,6,6,6,6,6,5,5,5,5,6,6,6,6,6,6,6,7,7,5,5,
                5,5,5,7,6,7,5,5,5,5,5,5,5,5,5,5,5,5,6,6,7,7,7,7,7,5,5,5,5,
                5,5,5,7,6,7,5,5,5,5,5,5,5,5,5,5,5,5,6,6,7,7,7,7,7,5,5,5,5,
        };

In Java

Right now the random test is failing. But it seems to expect a wrong solution:

6 6 5 5 5 5
5 5 5 5 5 5
5 5 <FONT COLOR="#ff0000">5 5</FONT> 5 5
6 6 5 5 5 5
6 6 5 5 5 5
6 6 5 5 5 5

In this example, the random test ist expecting only 1 field with maximum depth of 3 (indizes: 2, 3, starting from upper left corner). My code return 2 fields. As far as I understood the description, it should be 2. Can someone help pls?

Thank you.

Test keeps telling: arrays first differed at element [0]; expected:<55> but was:<1836311903>
It works correct on my machine.
Any ideas? (java)

My solution passed, but does not work properly:
my hand "7C 7S 2S 2H AH" wins against "KC KH 5D QS QC".

A test is missing for this case I guess.

Yeah, thats true. I was considering "Strings with one word do not need gaps ('somelongword\n')." In this case the word has the same length as the width then.

Somewhere in your justified text there is probably something different to what is expected...

There is a test missing, which covers the rule with long words (bigger than width)

Stack is synchronized, which is not needed here. Use Deque instead.