diff --git a/tests/test_regions.py b/tests/test_regions.py
old mode 100644
new mode 100755
index 62136299..433b5218
--- a/tests/test_regions.py
+++ b/tests/test_regions.py
@@ -4,13 +4,12 @@
 """
 
 from __future__ import print_function
-
-__author__ = 'Paul Hancock'
-
 from AegeanTools.regions import Region
 import numpy as np
 import os
 
+__author__ = 'Paul Hancock'
+
 
 def test_radec2sky():
     """Test function: Region.radec2sky"""
@@ -202,7 +201,16 @@ def test_intersect():
     b = Region(maxdepth=7)
     b.add_circles(0, np.radians(-90), np.radians(0.5))
     a.intersect(b)
-    if not (a.get_area() == b.get_area()): raise AssertionError("test_intersect FAILED")
+    if not (a.get_area() == b.get_area()):
+        raise AssertionError("test_intersect FAILED")
+
+    a = Region(maxdepth=8)
+    a.add_circles(0, np.radians(75), np.radians(3))
+    c = Region(maxdepth=8)
+    c.add_circles(0, np.radians(90), np.radians(10))
+    a.intersect(c)
+    if not (a.get_area() == 0.):
+        raise AssertionError("test_intersect FAILED")
 
 
 def test_demote():