Added unit test for surface.get_colorkey(). Closes #1801

test/surface_test.py

@@ -1000,14 +1000,45 @@ def test_get_clip(self):
         rectangle = s.get_clip()
         self.assertEqual(rectangle, (0, 0, 800, 600))
 
-    def todo_test_get_colorkey(self):
-        surf = pygame.surface((2, 2), 0, 24)
-        self.assertIsNone(surf.get_colorykey())
-        colorkey = pygame.Color(20, 40, 60)
-        surf.set_colorkey(colorkey)
-        ck = surf.get_colorkey()
-        self.assertIsInstance(ck, pygame.Color)
-        self.assertEqual(ck, colorkey)
+    def test_get_colorkey(self):
+        # if set_colorkey is not used
+        s = pygame.Surface((800, 600))
+        self.assertIsNone(s.get_colorkey())
+
+        # if set_colorkey is used
+        s.set_colorkey(None)
+        self.assertIsNone(s.get_colorkey())
+
+        # setting up remainder of tests...
+        r, g, b, a  = 20, 40, 60, 12
+        colorkey = pygame.Color(r, g, b)
+        s.set_colorkey(colorkey)
+
+        #test for ideal case
+        self.assertEqual(s.get_colorkey(), (r, g, b, 255))
+
+        #test for if the color_key is set using pygame.RLEACCEL
+        s.set_colorkey(colorkey, pygame.RLEACCEL)
+        self.assertEqual(s.get_colorkey(), (r, g, b, 255))
+
+        #test for if the color key is not what's expected
+        s.set_colorkey(pygame.Color(r + 1, g + 1, b + 1))
+        self.assertNotEqual(s.get_colorkey(), (r, g, b, 255))
+
+        s.set_colorkey(pygame.Color(r, g, b, a)) # regardless of whether alpha is not 255, colorkey returned from surface is always 255
+        self.assertEqual(s.get_colorkey(), (r, g, b, 255))
+
+        # test for using method after display.quit() is called...
+        with self.assertRaises(pygame.error):
+            s = pygame.display.set_mode()
+            pygame.display.quit()
+            s.get_colorkey()
+
+        # test for using method when display is created with OpenGL and the SDL version is 1
+        if SDL1: # SLD1 is a bool defined at the top...
+            with self.assertRaises(pygame.error):   
+                s = pygame.display.set_mode(flags=pygame.OPENGL)
+                s.get_colorkey()
 
     def test_get_height(self):
         sizes = ((1, 1), (119, 10), (10, 119), (1, 1000), (1000, 1), (1000, 1000))