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diff --git a/crocoite/test_html.py b/crocoite/test_html.py
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+# Copyright (c) 2017 crocoite contributors
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+import pytest, html5lib
+from html5lib.serializer import HTMLSerializer
+from html5lib.treewalkers import getTreeWalker
+
+from .html import StripTagFilter, StripAttributeFilter
+
+def test_strip_tag ():
+    d = html5lib.parse ('<a>barbaz<b>foobar</b>.</a><b>foobar</b>.<b attr=1><c></c>')
+    stream = StripTagFilter (getTreeWalker ('etree')(d), ['b', 'c'])
+    serializer = HTMLSerializer ()
+    assert serializer.render (stream) == '<a>barbaz.</a>.'
+
+def test_strip_attribute ():
+    d = html5lib.parse ('<a b=1 c="yes" d></a><br b=2 c="no" d keep=1>')
+    stream = StripAttributeFilter (getTreeWalker ('etree')(d), ['b', 'c', 'd'])
+    serializer = HTMLSerializer ()
+    assert serializer.render (stream) == '<a></a><br keep=1>'
+