def test_greed3(self):
     """Test the greedy algorithm
     """
     main(self.INPUT_PATH, "greed", self.OUTPUT_PATH, 2)
     res = Image.open(self.OUTPUT_PATH)
     assert res.getpixel((0, 0)) == (10, 10, 10)
     assert res.getpixel((0, 1)) == (10, 10, 10)
     assert res.getpixel((1, 0)) == (252, 252, 252)
     assert res.getpixel((1, 1)) == (252, 252, 252)
 def test_clu(self):
     """Test the clustering algorithm
     """
     main(self.INPUT_PATH, "clu", self.OUTPUT_PATH, 2)
     res = Image.open(self.OUTPUT_PATH)
     assert res.getpixel((0, 0)) == (10, 10, 10)
     assert res.getpixel((0, 1)) == (10, 10, 10)
     assert res.getpixel((1, 0)) == (252, 252, 252)
     assert res.getpixel((1, 1)) == (252, 252, 252)
 def test_grow1(self):
     """Test the region growth algorithm
     """
     main(self.INPUT_PATH, "grow", self.OUTPUT_PATH, 1)
     res = Image.open(self.OUTPUT_PATH)
     assert res.getpixel((0, 0)) == (0, 0, 0)
     assert res.getpixel((0, 1)) == (20, 20, 20)
     assert res.getpixel((1, 0)) == (250, 250, 250)
     assert res.getpixel((1, 1)) == (255, 255, 255)
 def test_grow3(self):
     """Test the region growth algorithm
     """
     main(self.INPUT_PATH, "grow", self.OUTPUT_PATH, 25)
     res = Image.open(self.OUTPUT_PATH)
     assert res.getpixel((0, 0)) == (10, 10, 10)
     assert res.getpixel((0, 1)) == (10, 10, 10)
     assert res.getpixel((1, 0)) == (252, 252, 252)
     assert res.getpixel((1, 1)) == (252, 252, 252)
 def test_pre(self):
     """Test the threshold algorithm
     """
     main(self.INPUT_PATH, "pre", self.OUTPUT_PATH, 1)
     res = Image.open(self.OUTPUT_PATH)
     assert res.getpixel((0, 0)) == (0, 0, 0)
     assert res.getpixel((0, 1)) == (0, 0, 0)
     assert res.getpixel((1, 0)) == (128, 128, 128)
     assert res.getpixel((1, 1)) == (128, 128, 128)