diff -r 76713f4d9f0f Lib/idlelib/idle_test/test_formatparagraph.py
--- a/Lib/idlelib/idle_test/test_formatparagraph.py	Sun Feb 09 06:07:47 2014 -0800
+++ b/Lib/idlelib/idle_test/test_formatparagraph.py	Sun Feb 09 19:11:11 2014 +0200
@@ -277,6 +277,9 @@
     @classmethod
     def tearDownClass(cls):
         cls.root.destroy()
+        del cls.root
+        del cls.text
+        del cls.formatter
 
     def test_short_line(self):
         self.text.insert('1.0', "Short line\n")
diff -r 76713f4d9f0f Lib/idlelib/idle_test/test_idlehistory.py
--- a/Lib/idlelib/idle_test/test_idlehistory.py	Sun Feb 09 06:07:47 2014 -0800
+++ b/Lib/idlelib/idle_test/test_idlehistory.py	Sun Feb 09 19:11:11 2014 +0200
@@ -80,6 +80,7 @@
     @classmethod
     def tearDownClass(cls):
         cls.root.destroy()
+        del cls.root
 
     def fetch_test(self, reverse, line, prefix, index, *, bell=False):
         # Perform one fetch as invoked by Alt-N or Alt-P
diff -r 76713f4d9f0f Lib/idlelib/idle_test/test_searchengine.py
--- a/Lib/idlelib/idle_test/test_searchengine.py	Sun Feb 09 06:07:47 2014 -0800
+++ b/Lib/idlelib/idle_test/test_searchengine.py	Sun Feb 09 19:11:11 2014 +0200
@@ -64,6 +64,7 @@
 ##    @classmethod
 ##    def tearDownClass(cls):
 ##        cls.root.destroy()
+##        del cls.root
 
     def test_get_selection(self):
         # text = Text(master=self.root)
@@ -219,6 +220,7 @@
 ##    @classmethod
 ##    def tearDownClass(cls):
 ##        cls.root.destroy()
+##        del cls.root
 
     def test_search(self):
         Equal = self.assertEqual
@@ -261,6 +263,7 @@
 ##    @classmethod
 ##    def tearDownClass(cls):
 ##        cls.root.destroy()
+##        del cls.root
 
     @classmethod
     def setUpClass(cls):
diff -r 76713f4d9f0f Lib/idlelib/idle_test/test_text.py
--- a/Lib/idlelib/idle_test/test_text.py	Sun Feb 09 06:07:47 2014 -0800
+++ b/Lib/idlelib/idle_test/test_text.py	Sun Feb 09 19:11:11 2014 +0200
@@ -221,6 +221,7 @@
     @classmethod
     def tearDownClass(cls):
         cls.root.destroy()
+        del cls.root
 
 
 if __name__ == '__main__':
diff -r 76713f4d9f0f Lib/test/test_idle.py
--- a/Lib/test/test_idle.py	Sun Feb 09 06:07:47 2014 -0800
+++ b/Lib/test/test_idle.py	Sun Feb 09 19:11:11 2014 +0200
@@ -14,6 +14,7 @@
     try:
         root = tk.Tk()
         root.destroy()
+        del root
     except tk.TclError:
         while 'gui' in use_resources:
             use_resources.remove('gui')