Fix for https://github.com/spulec/moto/issues/72

Need to run the whole test suite to make sure no regressions were added

moto/core/models.py

@@ -7,9 +7,13 @@ from .utils import convert_regex_to_flask_path
 
 
 class MockAWS(object):
+    nested_count = 0
+
     def __init__(self, backend):
         self.backend = backend
-        HTTPretty.reset()
+
+        if self.__class__.nested_count == 0:
+            HTTPretty.reset()
 
     def __call__(self, func):
         return self.decorate_callable(func)
@@ -22,7 +26,9 @@ class MockAWS(object):
 
     def start(self):
         self.backend.reset()
-        HTTPretty.enable()
+
+        if not HTTPretty.is_enabled():
+            HTTPretty.enable()
 
         for method in HTTPretty.METHODS:
             for key, value in self.backend.urls.iteritems():
@@ -40,7 +46,10 @@ class MockAWS(object):
             )
 
     def stop(self):
-        HTTPretty.disable()
+        self.__class__.nested_count -= 1
+
+        if self.__class__.nested_count == 0:
+            HTTPretty.disable()
 
     def decorate_callable(self, func):
         def wrapper(*args, **kwargs):

tests/test_core/test_nested.py

@@ -0,0 +1,28 @@
+import unittest
+
+from boto.sqs.connection import SQSConnection
+from boto.sqs.message import Message
+from boto.ec2 import EC2Connection
+
+from moto import mock_sqs, mock_ec2
+
+
+class TestNestedDecorators(unittest.TestCase):
+
+    @mock_sqs
+    def setup_sqs_queue(self):
+        conn = SQSConnection()
+        q = conn.create_queue('some-queue')
+
+        m = Message()
+        m.set_body('This is my first message.')
+        q.write(m)
+
+        self.assertEqual(q.count(), 1)
+
+    @mock_ec2
+    def test_nested(self):
+        self.setup_sqs_queue()
+
+        conn = EC2Connection()
+        conn.run_instances('ami-123456')