def test_vstack():
 t1 = QTable(MIXIN_COLS)
 t2 = QTable(MIXIN_COLS)
 with pytest.raises(NotImplementedError):
  vstack([t1, t2])

def test_vstack ( ) : t1 = QTable ( MIXIN_COLS ) t2 = QTable ( MIXIN_COLS ) with pytest . raises ( NotImplementedError ) : vstack ( [ t1 , t2 ] )
vstack tables with mixin cols .