def test_full_merge(self):
     self.cleanup_tiles = [create_tmp_image_file((100, 100)) for _ in range(9)]
     self.tiles = [ImageSource(tile) for tile in self.cleanup_tiles]
     m = TileMerger(tile_grid=(3, 3), tile_size=(100, 100))
     img_opts = ImageOptions()
     result = m.merge(self.tiles, img_opts)
     img = result.as_image()
     eq_(img.size, (300, 300))

 def test_one(self):
     self.cleanup_tiles = [create_tmp_image_file((100, 100))]
     self.tiles = [ImageSource(self.cleanup_tiles[0])]
     m = TileMerger(tile_grid=(1, 1), tile_size=(100, 100))
     img_opts = ImageOptions(transparent=True)
     result = m.merge(self.tiles, img_opts)
     img = result.as_image()
     eq_(img.size, (100, 100))
     eq_(img.mode, 'RGBA')

 def test_missing_tiles(self):
     self.cleanup_tiles = [create_tmp_image_file((100, 100))]
     self.tiles = [ImageSource(self.cleanup_tiles[0])]
     self.tiles.extend([None]*8)
     m = TileMerger(tile_grid=(3, 3), tile_size=(100, 100))
     img_opts = ImageOptions()
     result = m.merge(self.tiles, img_opts)
     img = result.as_image()
     eq_(img.size, (300, 300))
     eq_(img.getcolors(), [(80000, (255, 255, 255)), (10000, (0, 0, 0)), ])

 def test_invalid_tile(self):
     self.cleanup_tiles = [create_tmp_image_file((100, 100)) for _ in range(9)]
     self.tiles = [ImageSource(tile) for tile in self.cleanup_tiles]
     invalid_tile = self.tiles[0].source
     with open(invalid_tile, 'w') as tmp:
         tmp.write('invalid')
     m = TileMerger(tile_grid=(3, 3), tile_size=(100, 100))
     img_opts = ImageOptions(bgcolor=(200, 0, 50))
     result = m.merge(self.tiles, img_opts)
     img = result.as_image()
     eq_(img.size, (300, 300))
     eq_(img.getcolors(), [(10000, (200, 0, 50)), (80000, (0, 0, 0))])
     assert not os.path.isfile(invalid_tile)

 def setup(self):
     self.tmp_filename = create_tmp_image_file((100, 100))