added more unittests

Author: itzpr3d4t0r

test/rect_test.py

@@ -847,6 +847,10 @@ def test_clip(self):
         self.assertEqual(
             r1, r1.clip(Rect(r1)), "r1 does not clip an identical rect to itself"
         )
+        self.assertEqual(Rect(1, 2, 0, 0), r1.clip(Rect(3, 0, 2, 2)))
+        self.assertEqual(Rect(1, 2, 0, 0), r1.clip(Rect(3, 8, 2, 2)))
+        self.assertEqual(Rect(1, 2, 0, 0), r1.clip(Rect(-2, 8, 2, 2)))
+        self.assertEqual(Rect(1, 2, 0, 0), r1.clip(Rect(-2, 0, 2, 2)))
 
     def test_clipline(self):
         """Ensures clipline handles four int parameters.