• Test framework and solution should be imported explicitly
• The assertions in the random tests are set up in a completely nonsensical way
• Practically a duplciate of the "Multiply" kata

The description needs to clear and concise, right now it is unnecessarily verbose, and despite of its verbosity it is not clear at all.

• C state is not explained anywhere
• Floodfill is not a novel idea

Duplicate.

Bin to hex (and other similar conversions) were done already many times, in better quality (e.g this one); furthermore, they can be done with simple builtin functions; so there is nothing new here.

Input validation should be removed.

Could someone help me to fix test cases?

Sample tests:

main.cpp:11:9: error: C++ requires a type specifier for all declarations
Assert::That(alien_logo(2, 3), Equals(
        ^
main.cpp:11:32: error: no matching function for call to 'Equals'
Assert::That(alien_logo(2, 3), Equals(
                               ^~~~~~

main.cpp:15:45: error: use of undeclared identifier 'alien'
    Assert::That(alien_logo(7, 7),   Equals(alien(7, 7)));
                                            ^
...
main.cpp:25:29: error: use of undeclared identifier 'par'
    Assert::That(alien_logo(par.gen_N(), par.gen_skip()),  Equals(alien(par.get_N(), par.get_skip())));
                            ^