Kata

Missing random tests ;-)

Sample tests relies on the existence of using namespace std; in user code to work.

The image in the description is dead.

Nice kata with a classic problem.

You might want to consider using the full power of the test frameword (i.e. Igloo / Snowhouse). Put this into the "Preloaded" section:

#include <list>

namespace snowhouse
{
    template<>
    struct Stringizer<std::list<std::pair<int,int>>>
    {
        static std::string ToString(const std::list<std::pair<int,int>>& a)
        {
            if (a.empty()) return "{}";
            std::ostringstream stream;
            stream << "{(" << a.front().first << ", " << a.front().second << ')';
            for (auto it = std::next(a.begin()); it != a.end(); ++it)
                stream << ", (" << it->first << ", " << it->second << ')';
            stream << '}';
            return stream.str();
        }
    };
}

and change Assert::That(expected == actual); to Assert::That(actual, Equals(expected)); to get more helpful output for failed tests.