def test_slide_line(self):
WT = Nonogram.WHITE
BK = Nonogram.BLACK
UN = Nonogram.UNKNOWN
f = Nonogram()
fld = f._slide_line([2], 2)
self.assertEqual(fld, [BK, BK])
fld = f._slide_line([2], 3)
self.assertEqual(fld, [UN, BK, UN])
fld = f._slide_line([2], 4)
self.assertEqual(fld, [UN]*4)
fld = f._slide_line([3,1], 5)
self.assertEqual(fld, [BK,BK,BK,WT,BK])
fld = f._slide_line([3,1], 6)
self.assertEqual(fld, [UN,BK,BK,UN,UN,UN])
fld = f._slide_line([3,1], 7)
self.assertEqual(fld, [UN,UN,BK,UN,UN,UN,UN])
