def test_image_scanner_properties():
scan = ImageScanner()
with pytest.raises(ValueError):
scan.levels = 0
scan.levels = 3
assert len(scan.traversal) == scan.levels
with pytest.raises(ValueError):
scan.level_scale = []
with pytest.raises(ValueError):
scan.level_scale = [1, -1]
scan.level_scale = range(2, 10)
assert scan.level_scale == [2, 3]
assert scan.min_size == 6
scan.level_scale = 2
assert scan.level_scale == [2, 2]
assert scan.min_size == 4
scan.levels = 2
assert len(scan.traversal) == scan.levels
assert scan.level_scale == [2]
assert scan.min_size == 2
scan.levels = 1
assert len(scan.traversal) == scan.levels
assert scan.level_scale == []
assert scan.min_size == 1
traversal = [HLines(), VLines()]
scan.traversal = traversal
scan.levels = 2
assert scan.traversal is traversal
assert scan.level_scale == [2]
def test_properties(self):
scan = ImageScanner()
self.assertEqual(scan.palette, default_palette(8, 4, 8))
self.assertIsNotNone(scan.palette_image)
self.assertIsNotNone(scan.levels)
self.assertIsNotNone(scan.min_size)
self.assertIsInstance(scan.level_scale, list)
self.assertIsInstance(scan.traversal, list)
self.assertEqual(len(scan.level_scale), scan.levels - 1)
self.assertEqual(len(scan.traversal), scan.levels)
scan.palette = self.palette
self.assertIsNotNone(scan.palette)
self.assertIsNotNone(scan.palette_image)
with self.assertRaises(ValueError):
scan.levels = 0
scan.levels = 3
self.assertEqual(len(scan.traversal), scan.levels)
with self.assertRaises(ValueError):
scan.level_scale = []
with self.assertRaises(ValueError):
scan.level_scale = [1, -1]
scan.level_scale = range(2, 10)
self.assertEqual(scan.level_scale, [2, 3])
self.assertEqual(scan.min_size, 6)
scan.level_scale = 2
self.assertEqual(scan.level_scale, [2, 2])
self.assertEqual(scan.min_size, 4)
scan.levels = 2
self.assertEqual(len(scan.traversal), scan.levels)
self.assertEqual(scan.level_scale, [2])
self.assertEqual(scan.min_size, 2)
scan.levels = 1
self.assertEqual(len(scan.traversal), scan.levels)
self.assertEqual(scan.level_scale, [])
self.assertEqual(scan.min_size, 1)
traversal = [HLines(), VLines()]
scan.traversal = traversal
scan.levels = 2
self.assertIs(scan.traversal, traversal)
self.assertEqual(scan.level_scale, [2])
