#include <quiz.h>
  #include <ion.h>
  #include <assert.h>
  
  using namespace Ion::Keyboard;
  
  QUIZ_CASE(ion_keyboard) {
    for (Key k : ValidKeys) {
      for (Key l : ValidKeys) {
        assert(State(k).keyDown(l) == (k == l));
      }
    }
  }