diff --git a/IPython/testing/iptest.py b/IPython/testing/iptest.py
index d100ec2..9e1a883 100644
--- a/IPython/testing/iptest.py
+++ b/IPython/testing/iptest.py
@@ -44,6 +44,8 @@ pjoin = path.join
 
 
 # Enable printing all warnings raise by IPython's modules
+if sys.version_info > (3,0):
+    warnings.filterwarnings('error', message='.*', category=ResourceWarning, module='.*')
 warnings.filterwarnings('default', message='.*', category=Warning, module='IPy.*')
 
 if version_info < (6,):
diff --git a/IPython/testing/tests/test_tools.py b/IPython/testing/tests/test_tools.py
index a4c2e77..9c6db65 100644
--- a/IPython/testing/tests/test_tools.py
+++ b/IPython/testing/tests/test_tools.py
@@ -132,3 +132,9 @@ class Test_ipexec_validate(unittest.TestCase, tt.TempFileMixin):
                    )
         out = "A\r\nB"
         tt.ipexec_validate(self.fname, expected_out=out, expected_err="C\r\nD")
+
+
+    def tearDown(self):
+        # tear down correctly the mixin,
+        # unittest.TestCase.tearDown does nothing
+        tt.TempFileMixin.tearDown(self)