diff --git a/example/test_abstract.py b/example/test_abstract.py
index dda8aaa7..a48aff1b 100644
--- a/example/test_abstract.py
+++ b/example/test_abstract.py
@@ -17,7 +17,8 @@ def run(args = None):
         import sys
         sys.argv = args
     import doctest, test_abstract
-    doctest.testmod(test_abstract)
+    return doctest.testmod(test_abstract)
 
 if __name__ == '__main__':
-    run()
+    import sys
+    sys.exit(run()[0])
diff --git a/example/test_cross_module.py b/example/test_cross_module.py
index 81057f23..86c1be0e 100644
--- a/example/test_cross_module.py
+++ b/example/test_cross_module.py
@@ -133,7 +133,8 @@ def run(args = None):
         import sys
         sys.argv = args
     import doctest, test_cross_module
-    doctest.testmod(test_cross_module)
+    return doctest.testmod(test_cross_module)
 
 if __name__ == '__main__':
-    run()
+    import sys
+    sys.exit(run())
diff --git a/example/test_do_it_yourself_converters.py b/example/test_do_it_yourself_converters.py
index e256c614..17240750 100644
--- a/example/test_do_it_yourself_converters.py
+++ b/example/test_do_it_yourself_converters.py
@@ -16,7 +16,8 @@ def run(args = None):
         import sys
         sys.argv = args
     import doctest, test_do_it_yourself_converters
-    doctest.testmod(test_do_it_yourself_converters)
+    return doctest.testmod(test_do_it_yourself_converters)
 
 if __name__ == '__main__':
-    run()
+    import sys
+    sys.exit(run()[0])
diff --git a/example/test_example1.py b/example/test_example1.py
index 0e3a9a18..3a30cb5b 100644
--- a/example/test_example1.py
+++ b/example/test_example1.py
@@ -44,7 +44,8 @@ def run(args = None):
         import sys
         sys.argv = args
     import doctest, test_example1
-    doctest.testmod(test_example1)
+    return doctest.testmod(test_example1)
     
 if __name__ == '__main__':
-    run()
+    import sys
+    sys.exit(run()[0])
diff --git a/example/test_getting_started1.py b/example/test_getting_started1.py
index 7daf65af..cd8fb59e 100644
--- a/example/test_getting_started1.py
+++ b/example/test_getting_started1.py
@@ -11,7 +11,8 @@ def run(args = None):
         import sys
         sys.argv = args
     import doctest, test_getting_started1
-    doctest.testmod(test_getting_started1)
+    return doctest.testmod(test_getting_started1)
 
 if __name__ == '__main__':
-    run()
+    import sys
+    sys.exit(run()[0])
diff --git a/example/test_getting_started2.py b/example/test_getting_started2.py
index 49cf765d..ccfaa4f1 100644
--- a/example/test_getting_started2.py
+++ b/example/test_getting_started2.py
@@ -23,7 +23,9 @@ def run(args = None):
         import sys
         sys.argv = args
     import doctest, test_getting_started2
-    doctest.testmod(test_getting_started2)
+    return doctest.testmod(test_getting_started2)
 
 if __name__ == '__main__':
-    run()
+    import sys
+    sys.exit(run()[0])
+
diff --git a/example/test_pickle1.py b/example/test_pickle1.py
index 05696d4a..48c76a5f 100644
--- a/example/test_pickle1.py
+++ b/example/test_pickle1.py
@@ -25,7 +25,9 @@ def run(args = None):
         import sys
         sys.argv = args
     import doctest, test_pickle1
-    doctest.testmod(test_pickle1)
+    return doctest.testmod(test_pickle1)
 
 if __name__ == '__main__':
-    run()
+    import sys
+    sys.exit(run()[0])
+
diff --git a/example/test_pickle2.py b/example/test_pickle2.py
index 463befa6..bafa9875 100644
--- a/example/test_pickle2.py
+++ b/example/test_pickle2.py
@@ -39,7 +39,9 @@ def run(args = None):
         import sys
         sys.argv = args
     import doctest, test_pickle2
-    doctest.testmod(test_pickle2)
+    return doctest.testmod(test_pickle2)
 
 if __name__ == '__main__':
-    run()
+    import sys
+    sys.exit(run()[0])
+
diff --git a/example/test_pickle3.py b/example/test_pickle3.py
index b964f1a2..36da735d 100644
--- a/example/test_pickle3.py
+++ b/example/test_pickle3.py
@@ -32,7 +32,8 @@ def run(args = None):
         import sys
         sys.argv = args
     import doctest, test_pickle3
-    doctest.testmod(test_pickle3)
+    return doctest.testmod(test_pickle3)
 
 if __name__ == '__main__':
-    run()
+    import sys
+    sys.exit(run()[0])
diff --git a/example/test_rwgk1.py b/example/test_rwgk1.py
index 87298875..631eea3e 100644
--- a/example/test_rwgk1.py
+++ b/example/test_rwgk1.py
@@ -11,7 +11,9 @@ def run(args = None):
         import sys
         sys.argv = args
     import doctest, test_rwgk1
-    doctest.testmod(test_rwgk1)
+    return doctest.testmod(test_rwgk1)
 
 if __name__ == '__main__':
-    run()
+    import sys
+    sys.exit(run()[0])
+
diff --git a/example/test_simple_vector.py b/example/test_simple_vector.py
index ca38d715..c6a2cd59 100644
--- a/example/test_simple_vector.py
+++ b/example/test_simple_vector.py
@@ -34,7 +34,9 @@ def run(args = None):
         import sys
         sys.argv = args
     import doctest, test_simple_vector
-    doctest.testmod(test_simple_vector)
+    return doctest.testmod(test_simple_vector)
 
 if __name__ == '__main__':
-    run()
+    import sys
+    sys.exit(run()[0])
+
diff --git a/test/comprehensive.py b/test/comprehensive.py
index c1424d25..06a191af 100644
--- a/test/comprehensive.py
+++ b/test/comprehensive.py
@@ -1188,7 +1188,7 @@ def run(args = None):
     if args is not None:
         sys.argv = args
     import doctest, comprehensive
-    doctest.testmod(comprehensive)
+    return doctest.testmod(comprehensive)
     
 if __name__ == '__main__':
-    run()
+    sys.exit(run()[0])