public function testNpcListSortedByDifficultyGetsEasyNpcLast()
{
$npcs_by_diff = NpcFactory::allSortedByDifficulty();
$first_npc = reset($npcs_by_diff);
$last_npc = array_pop($npcs_by_diff);
$this->assertLessThan(10, $first_npc->difficulty());
$this->assertEquals('Ryu', $last_npc->identity());
// For now ryu will be the testable top npc.
$this->assertGreaterThan(300, $last_npc->difficulty());
}
