diff --git a/Lib/test/test___all__.py b/Lib/test/test___all__.py
index 200db5c..695669a 100644
--- a/Lib/test/test___all__.py
+++ b/Lib/test/test___all__.py
@@ -2,7 +2,6 @@
 from test import support
 import os
 import sys
-import warnings
 
 
 class NoAll(RuntimeError):
@@ -16,9 +15,8 @@
 
     def check_all(self, modname):
         names = {}
-        with warnings.catch_warnings():
-            warnings.filterwarnings("ignore", ".* (module|package)",
-                                    DeprecationWarning)
+        with support.check_warnings((".* (module|package)",
+                                     DeprecationWarning), quiet=True):
             try:
                 exec("import %s" % modname, names)
             except:
diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
index a140f1c..85513a5 100644
--- a/Lib/test/test_argparse.py
+++ b/Lib/test/test_argparse.py
@@ -7,7 +7,6 @@
 import textwrap
 import tempfile
 import unittest
-import warnings
 import argparse
 
 from io import StringIO
@@ -4150,21 +4149,12 @@
             self.assertTrue(hasattr(argparse, name))
 
 def test_main():
-    with warnings.catch_warnings():
-        # silence warnings about version argument - these are expected
-        warnings.filterwarnings(
-            action='ignore',
-            message='The "version" argument to ArgumentParser is deprecated.',
-            category=DeprecationWarning)
-        warnings.filterwarnings(
-            action='ignore',
-            message='The format_version method is deprecated',
-            category=DeprecationWarning)
-        warnings.filterwarnings(
-            action='ignore',
-            message='The print_version method is deprecated',
-            category=DeprecationWarning)
-
+    # silence warnings about version argument - these are expected
+    with support.check_warnings(
+            ('The "version" argument to ArgumentParser is deprecated.',
+             DeprecationWarning),
+            ('The (format|print)_version method is deprecated',
+             DeprecationWarning)):
         support.run_unittest(__name__)
     # Remove global references to avoid looking like we have refleaks.
     RFile.seen = {}
diff --git a/Lib/test/test_complex.py b/Lib/test/test_complex.py
index a857354..6441208 100644
--- a/Lib/test/test_complex.py
+++ b/Lib/test/test_complex.py
@@ -1,4 +1,4 @@
-import unittest, os
+import unittest
 from test import support
 
 from random import random
@@ -395,10 +395,7 @@
         finally:
             if (fo is not None) and (not fo.closed):
                 fo.close()
-            try:
-                os.remove(support.TESTFN)
-            except (OSError, IOError):
-                pass
+            support.unlink(support.TESTFN)
 
     def test_getnewargs(self):
         self.assertEqual((1+2j).__getnewargs__(), (1.0, 2.0))
diff --git a/Lib/test/test_contextlib.py b/Lib/test/test_contextlib.py
index 1d3bd90..c733bca 100644
--- a/Lib/test/test_contextlib.py
+++ b/Lib/test/test_contextlib.py
@@ -1,7 +1,5 @@
 """Unit tests for contextlib.py, and other context managers."""
 
-
-import os
 import sys
 import tempfile
 import unittest
@@ -9,6 +7,7 @@
 from contextlib import *  # Tests __all__
 from test import support
 
+
 class ContextManagerTestCase(unittest.TestCase):
 
     def test_contextmanager_plain(self):
@@ -33,16 +32,12 @@
                 yield 42
             finally:
                 state.append(999)
-        try:
+        with self.assertRaises(ZeroDivisionError):
             with woohoo() as x:
                 self.assertEqual(state, [1])
                 self.assertEqual(x, 42)
                 state.append(x)
                 raise ZeroDivisionError()
-        except ZeroDivisionError:
-            pass
-        else:
-            self.fail("Expected ZeroDivisionError")
         self.assertEqual(state, [1, 42, 999])
 
     def test_contextmanager_no_reraise(self):
@@ -130,14 +125,11 @@
                 state.append(1)
         x = C()
         self.assertEqual(state, [])
-        try:
+        with self.assertRaises(ZeroDivisionError):
             with closing(x) as y:
                 self.assertEqual(x, y)
-                1/0
-        except ZeroDivisionError:
-            self.assertEqual(state, [1])
-        else:
-            self.fail("Didn't raise ZeroDivisionError")
+                1 / 0
+        self.assertEqual(state, [1])
 
 class FileContextTestCase(unittest.TestCase):
 
@@ -150,20 +142,14 @@
                 f.write("Booh\n")
             self.assertTrue(f.closed)
             f = None
-            try:
+            with self.assertRaises(ZeroDivisionError):
                 with open(tfn, "r") as f:
                     self.assertFalse(f.closed)
                     self.assertEqual(f.read(), "Booh\n")
-                    1/0
-            except ZeroDivisionError:
-                self.assertTrue(f.closed)
-            else:
-                self.fail("Didn't raise ZeroDivisionError")
+                    1 / 0
+            self.assertTrue(f.closed)
         finally:
-            try:
-                os.remove(tfn)
-            except os.error:
-                pass
+            support.unlink(tfn)
 
 class LockContextTestCase(unittest.TestCase):
 
@@ -172,14 +158,11 @@
         with lock:
             self.assertTrue(locked())
         self.assertFalse(locked())
-        try:
+        with self.assertRaises(ZeroDivisionError):
             with lock:
                 self.assertTrue(locked())
-                1/0
-        except ZeroDivisionError:
-            self.assertFalse(locked())
-        else:
-            self.fail("Didn't raise ZeroDivisionError")
+                1 / 0
+        self.assertFalse(locked())
 
     def testWithLock(self):
         lock = threading.Lock()
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 408f72b..5568dd5 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -2,7 +2,6 @@
 import sys
 import types
 import unittest
-import warnings
 
 from copy import deepcopy
 from test import support
diff --git a/Lib/test/test_doctest.py b/Lib/test/test_doctest.py
index 17842c9..ff01238 100644
--- a/Lib/test/test_doctest.py
+++ b/Lib/test/test_doctest.py
@@ -4,7 +4,6 @@
 
 from test import support
 import doctest
-import warnings
 
 # NOTE: There are some additional tests relating to interaction with
 #       zipimport in the test_zipimport_support test module.
diff --git a/Lib/test/test_global.py b/Lib/test/test_global.py
index a98e339..37ec672 100644
--- a/Lib/test/test_global.py
+++ b/Lib/test/test_global.py
@@ -2,7 +2,6 @@
 
 from test.support import run_unittest, check_syntax_error, check_warnings
 import unittest
-
 import warnings
 
 
@@ -54,7 +53,9 @@
 
 
 def test_main():
-    run_unittest(GlobalTests)
+    with warnings.catch_warnings():
+        warnings.filterwarnings("error", module="<test string>")
+        run_unittest(GlobalTests)
 
 if __name__ == "__main__":
     test_main()
diff --git a/Lib/test/test_hmac.py b/Lib/test/test_hmac.py
index fb78eba..4de0620 100644
--- a/Lib/test/test_hmac.py
+++ b/Lib/test/test_hmac.py
@@ -213,19 +213,13 @@
 
         with warnings.catch_warnings():
             warnings.simplefilter('error', RuntimeWarning)
-            try:
+            with self.assertRaises(RuntimeWarning):
                 hmac.HMAC(b'a', b'b', digestmod=MockCrazyHash)
-            except RuntimeWarning:
-                pass
-            else:
                 self.fail('Expected warning about missing block_size')
 
             MockCrazyHash.block_size = 1
-            try:
+            with self.assertRaises(RuntimeWarning):
                 hmac.HMAC(b'a', b'b', digestmod=MockCrazyHash)
-            except RuntimeWarning:
-                pass
-            else:
                 self.fail('Expected warning about small block_size')
 
 
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index bf0d03f..d5a6a4f 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -26,7 +26,6 @@
 import threading
 import random
 import unittest
-import warnings
 import weakref
 import abc
 from itertools import cycle, count
diff --git a/Lib/test/test_robotparser.py b/Lib/test/test_robotparser.py
index 86ebe9f..4c3b536 100644
--- a/Lib/test/test_robotparser.py
+++ b/Lib/test/test_robotparser.py
@@ -209,21 +209,19 @@
 class NetworkTestCase(unittest.TestCase):
 
     def testPasswordProtectedSite(self):
-        if not support.is_resource_enabled('network'):
-            return
-        # whole site is password-protected.
+        support.requires('network')
+        # XXX it depends on an external resource which could be unavailable
         url = 'http://mueblesmoraleda.com'
         parser = urllib.robotparser.RobotFileParser()
         parser.set_url(url)
         try:
             parser.read()
-            self.assertEqual(parser.can_fetch("*", url+"/robots.txt"), False)
         except URLError:
-            self.skipTest('mueblesmoraleda.com is unavailable')
+            self.skipTest('%s is unavailable' % url)
+        self.assertEqual(parser.can_fetch("*", url+"/robots.txt"), False)
 
     def testPythonOrg(self):
-        if not support.is_resource_enabled('network'):
-            return
+        support.requires('network')
         parser = urllib.robotparser.RobotFileParser(
             "http://www.python.org/robots.txt")
         parser.read()
diff --git a/Lib/test/test_sundry.py b/Lib/test/test_sundry.py
index ee387c7..365b98b 100644
--- a/Lib/test/test_sundry.py
+++ b/Lib/test/test_sundry.py
@@ -3,12 +3,10 @@
 from test import support
 import sys
 import unittest
-import warnings
 
 class TestUntestedModules(unittest.TestCase):
     def test_at_least_import_untested_modules(self):
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with support.check_warnings(quiet=True):
             import bdb
             import cgitb
             import code
diff --git a/Lib/test/test_xml_etree.py b/Lib/test/test_xml_etree.py
index f1990d1..249ac64 100644
--- a/Lib/test/test_xml_etree.py
+++ b/Lib/test/test_xml_etree.py
@@ -12,6 +12,7 @@
 # except if the test is specific to the Python implementation.
 
 import sys
+import cgi
 
 from test import support
 from test.support import findfile
@@ -1305,7 +1306,7 @@
   <p>Example.</p>
   <xi:include href="{}"/>
 </document>
-""".format(SIMPLE_XMLFILE)
+""".format(cgi.escape(SIMPLE_XMLFILE, True))
 
 def xinclude_loader(href, parse="xml", encoding=None):
     try:
@@ -1808,6 +1809,23 @@
 
 class CleanContext(object):
     """Provide default namespace mapping and path cache."""
+    checkwarnings = None
+
+    def __init__(self, quiet=False):
+        deprecations = (
+            # Search behaviour is broken if search path starts with "/".
+            ("This search is broken in 1.3 and earlier, and will be fixed "
+             "in a future version.  If you rely on the current behaviour, "
+             "change it to '.+'", FutureWarning),
+            # Element.getchildren() and Element.getiterator() are deprecated.
+            ("This method will be removed in future versions.  "
+             "Use .+ instead.", DeprecationWarning),
+            ("This method will be removed in future versions.  "
+             "Use .+ instead.", PendingDeprecationWarning),
+            # XMLParser.doctype() is deprecated.
+            ("This method of XMLParser is deprecated.  Define doctype.. "
+             "method on the TreeBuilder target.", DeprecationWarning))
+        self.checkwarnings = support.check_warnings(*deprecations, quiet=quiet)
 
     def __enter__(self):
         from xml.etree import ElementTree
@@ -1817,35 +1835,26 @@
         ElementTree._namespace_map = self._nsmap.copy()
         # Copy the path cache (should be empty)
         ElementTree.ElementPath._cache = self._path_cache.copy()
+        self.checkwarnings.__enter__()
 
     def __exit__(self, *args):
         from xml.etree import ElementTree
         # Restore mapping and path cache
         ElementTree._namespace_map = self._nsmap
         ElementTree.ElementPath._cache = self._path_cache
+        self.checkwarnings.__exit__(*args)
 
 
 def test_main(module_name='xml.etree.ElementTree'):
-    import warnings
     from test import test_xml_etree
-    def ignore(message, category=DeprecationWarning):
-        warnings.filterwarnings("ignore", message, category)
+
+    use_py_module = (module_name == 'xml.etree.ElementTree')
 
     # The same doctests are used for both the Python and the C implementations
     assert test_xml_etree.ET.__name__ == module_name
 
-    with warnings.catch_warnings(), CleanContext():
-        # Search behaviour is broken if search path starts with "/".
-        ignore("This search is broken in 1.3 and earlier, and will be fixed "
-               "in a future version.  If you rely on the current behaviour, "
-               "change it to '.+'", FutureWarning)
-        # Element.getchildren() and Element.getiterator() are deprecated.
-        ignore("This method will be removed in future versions.  "
-               "Use .+ instead.")
-        # XMLParser.doctype() is deprecated.
-        ignore("This method of XMLParser is deprecated.  "
-               "Define doctype.. method on the TreeBuilder target.")
-
+    # XXX the C module should give the same warnings as the Python module
+    with CleanContext(quiet=not use_py_module):
         support.run_doctest(test_xml_etree, verbosity=True)
 
     # The module should not be changed by the tests