I think for dart have to mention PI equals to 3.14159265359. I tried just 3.14 didn't work, then 3.14159 same didn't work.

my bad(

But description clearly says what to do when some value is out of 0-255 range.

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Any values that fall out of that range must be rounded to the closest valid value.

There is no issue.

It has bugs, because of given sample
expect(rgb(255, 255, 255), equals('FFFFFF'));
expect(rgb(255, 255, 300), equals('FFFFFF'));
expect(rgb(0, 0, 0), equals('000000'));
expect(rgb(148, 0, 211), equals('9400D3'));
expect(rgb(148, -20, 211), equals('9400D3'));
expect(rgb(144, 195, 212), equals('90C3D4'));
expect(rgb(212, 53, 12), equals('D4350C')); using dart language

IMHO you better write like int max = array[0]*array[1];

Actual is what your function returned, and it's wrong, the test says which input was used: "This sentence is a sentence", the expected value is ok, debug your code.

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The tests are ok, your code is wrong. Not a kata issue.

kata hint != kata suggestion ~~