queen_attack: replace assertFalse with assertIs
queen_attack: replace assertFalse with assertIs


behrtam/xpython,exercism/python,exercism/python,smalley/python,smalley/python,mweb/python,mweb/python,behrtam/xpython,pheanex/xpython,N-Parsons/exercism-python,N-Parsons/exercism-python,jmluy/xpython,jmluy/xpython,exercism/xpython,pheanex/xpython,exercism/xpython