100% coverage for contentinfo.py

CHANGES.rst

@@ -10,6 +10,8 @@
 - Fix an AttributeError accessing the ``preferredCharset`` of an
   ``ICodecTerm`` when no ``ICodecPreferredCharset`` was registered.
 
+- Reach and automatically require 100% test coverage.
+
 2.3.1 (2018-01-09)
 ==================
 

src/zope/mimetype/tests/test_contentinfo.py

@@ -0,0 +1,55 @@
+##############################################################################
+#
+# Copyright (c) 2005 Zope Foundation and Contributors.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+# -*- coding: utf-8 -*-
+"""
+Tests for contentinfo.py
+
+"""
+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+
+import unittest
+
+from zope import interface
+from zope.testing import cleanup
+
+from zope.mimetype.contentinfo import ContentInfo
+
+
+class TestContentinfo(cleanup.CleanUp,
+                      unittest.TestCase):
+    # py2 bwc
+    assertRaisesRegex = getattr(unittest.TestCase,
+                                'assertRaisesRegex',
+                                unittest.TestCase.assertRaisesRegexp)
+
+    def test_codec_cant_decode_all(self):
+        from zope.mimetype.interfaces import IContentTypeAware
+
+        @interface.implementer(IContentTypeAware)
+        class Content(object):
+            mimeType = 'text/plain'
+            parameters = ()
+
+
+        class Codec(object):
+            def decode(self, s):
+                return '', 0
+
+        info = ContentInfo(Content())
+        # ContentInfo caches the codec, take advantage of that.
+        info._codec = Codec()
+
+        with self.assertRaisesRegex(ValueError, "not completely consumed"):
+            info.decode('foo')

tox.ini

@@ -20,7 +20,7 @@ basepython =
     python2.7
 commands =
     coverage run -m zope.testrunner --test-path=src []
-    coverage report --fail-under=94
+    coverage report --fail-under=100
 deps =
     {[testenv]deps}
     coverage