diff --git a/test/test_point.py b/test/test_point.py
index a12d8f4..366f73a 100644
--- a/test/test_point.py
+++ b/test/test_point.py
@@ -55,19 +55,25 @@ def test_is_equal():
     assert pnt != pnt_diff_x
     assert pnt != pnt_diff_y
 
+    assert not pnt == None
+
 def test_sort_set():
     """Test the sorting algorithm"""
     point_set = [ \
         point.Point(94.01, 68.5), \
         point.Point(33.08, 86.28), \
-        point.Point(31.97, 34.14), \
+        point.Point(75.56, 34.14), \
+        point.Point(29.46, 69.56), \
         point.Point(72.76, 74.25), \
         point.Point(35.42, 8.76), \
         point.Point(31.44, 60.7), \
+        point.Point(31.97, 34.14), \
         point.Point(29.46, 17.73), \
         point.Point(74.33, 4.58), \
         point.Point(76.13, 59.69), \
         point.Point(1.37, 85.25), \
+        point.Point(29.46, 30.59), \
+        point.Point(69.69, 34.14), \
         point.Point(40.71, 34.02), \
         point.Point(35.18, 14.32), \
         point.Point(81.29, 55.71), \
@@ -79,8 +85,12 @@ def test_sort_set():
 
     for i in range(len(point_set) - 1):
         assert point_set[i].get_x() <= point_set[i + 1].get_x()
+        if point_set[i].get_x() == point_set[i + 1].get_x():
+            assert point_set[i].get_y() <= point_set[i + 1].get_y()
 
     point.sort_set(point_set, True)
 
     for i in range(len(point_set) - 1):
         assert point_set[i].get_y() <= point_set[i + 1].get_y()
+        if point_set[i].get_y() == point_set[i + 1].get_y():
+            assert point_set[i].get_x() <= point_set[i + 1].get_x()