diff --git a/senpy/plugins.py b/senpy/plugins.py
index b3dc37a..696d4ec 100644
--- a/senpy/plugins.py
+++ b/senpy/plugins.py
@@ -112,6 +112,9 @@ class SenpyPlugin(Leaf):
     def id(self):
         return "{}_{}".format(self.name, self.version)
 
+    def __del__(self):
+        ''' Destructor, to make sure all the resources are freed '''
+        self.deactivate()
 
 class SentimentPlugin(SenpyPlugin):
 
@@ -139,8 +142,8 @@ class ShelfMixin(object):
 
     @sh.deleter
     def sh(self):
-        if hasattr(self, '_sh'):
-            del(self._sh)
+        if os.path.isfile(self.shelf_file):
+            os.remove(self.shelf_file)
 
     @property
     def shelf_file(self):
diff --git a/setup.py b/setup.py
index c4077b2..ed022b8 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,7 @@ except AttributeError:
 install_reqs = [str(ir.req) for ir in install_reqs]
 test_reqs = [str(ir.req) for ir in test_reqs]
 
-VERSION = "0.4.11rc"
+VERSION = "0.4.11"
 
 setup(
     name='senpy',
diff --git a/tests/plugins_test/__init__.py b/tests/plugins_test/__init__.py
index b1a6571..2c179a3 100644
--- a/tests/plugins_test/__init__.py
+++ b/tests/plugins_test/__init__.py
@@ -1,3 +1,5 @@
+#!/bin/env python2
+# -*- py-which-shell: "python2"; -*-
 import os
 import logging
 import shelve
@@ -13,29 +15,56 @@ from senpy.models import Response, Entry
 from senpy.plugins import SenpyPlugin, ShelfMixin
 
 
-class ModelsTest(TestCase):
+class ShelfTest(ShelfMixin, SenpyPlugin):
 
-    # def test_shelf(self):
-    #     class ShelfTest(ShelfMixin):
-    #         pass
-    #     a = ShelfTest()
-    #     print(type(a.sh))
-    #     assert(False)
+    def test(self, key=None, value=None):
+        assert isinstance(self.sh, shelve.Shelf)
+        assert key in self.sh
+        print('Checking: sh[{}] == {}'.format(key, value))
+        print('SH[{}]: {}'.format(key, self.sh[key]))
+        assert self.sh[key] == value
+        
+
+
+class ModelsTest(TestCase):
+    shelf_file = 'shelf_test.db'
+
+
+    def tearDown(self):
+        if os.path.isfile(self.shelf_file):
+            os.remove(self.shelf_file)
+
+    setUp = tearDown
         
     def test_shelf(self):
-        class ShelfTest(ShelfMixin, SenpyPlugin):
-            pass
-        a = ShelfTest({'name': 'shelve', 'version': 'test'})
-        print(type(a.sh))
-        a.context = "ohno"
-        del a.context
-        print(a)
-        a.sh['classifier'] = {'name': 'ohno'}
-        assert a.name == 'shelve'
-        assert isinstance(a.sh, shelve.Shelf)
+        ''' A shelf is created and the value is stored '''
+        a = ShelfTest(info={'name': 'shelve',
+                            'version': 'test',
+                            'shelf_file': self.shelf_file})
+        assert a.sh == {}
+        assert a.shelf_file == self.shelf_file
+
+        a.sh['a'] = 'fromA'
+
+        a.test(key='a', value='fromA')
+        del(a)
+        assert os.path.isfile(self.shelf_file)
+        sh = shelve.open(self.shelf_file)
+        assert sh['a'] == 'fromA'
+
+
+    def test_two(self):
+        ''' Reusing the values of a previous shelf '''
+        a = ShelfTest(info={'name': 'shelve',
+                            'version': 'test',
+                            'shelf_file': self.shelf_file})
+        print('Shelf file: %s' % a.shelf_file)
+        a.sh['a'] = 'fromA'
         a.close()
-        b = ShelfTest({'name': 'shelve', 'version': 'test'})
-        assert b.name == 'shelve'
-        assert b.sh['classifier']
-        assert b.sh['classifier']['name'] == 'ohno'
-        assert isinstance(b.sh, shelve.Shelf)
+
+        b = ShelfTest(info={'name': 'shelve',
+                            'version': 'test',
+                            'shelf_file': self.shelf_file})
+        b.test(key='a', value='fromA')
+        b.sh['a'] = 'fromB'
+        assert b.sh['a'] == 'fromB'