I have to agree with dafuloth, the description is very difficult to understand and even after forfeiting to see the solution I don't understand the math behind.

Random tests were added.

You are welcome :)

Thank you for solving my Kata.

Thanks got that ! Still stuck on the last test tho...

Hint: look at your first if statement.

if (boolean1 || !Pattern.matches("[0-9a-fA-F]+", hexColor) || boolean3)

I run your code and.. yeah, it actually doesn't calculate complementary color for empty string.

Note that if input argument has length less than 6 then you should add a few zeros on begin:

"" -> "000000"

"FFF" -> "000FFF"

Due to the programming practice it's not necessary, but at the moment of writing this Kata I decided to make it little more complicated :)

It seems that you've stucked on this test:

assertEquals("#FFFFFF", HTMLComplementaryColor.getReversedColor(""));

Note that if input argument has length less than 6 then you should add a few zeros on begin:
"" -> "000000"
"FFF" -> "000FFF"

I am getting the following errors with my code but as they are truncated I cannot find my errors :

emptyStringEqualTo000000(HTMLComplementaryColorTest)
Unknown Test Failure

firstCharIsHashLengthEqualTo73(HTMLComplementaryColorTest)
Unknown Test Failure

incorrectStringType(HTMLComplementaryColorTest)
Unexpected exception, expected but was