1 files changed, 21 insertions, 0 deletions
diff --git a/lib/fixtures/tests/helpers.py b/lib/fixtures/tests/helpers.py
index ae0d8d3..680d396 100644
--- a/lib/fixtures/tests/helpers.py
+++ b/lib/fixtures/tests/helpers.py
@@ -15,6 +15,9 @@
 
 import fixtures
 
+from testtools.matchers import Mismatch
+
+
 class LoggingFixture(fixtures.Fixture):
 
     def __init__(self, suffix='', calls=None):
@@ -31,3 +34,21 @@ class LoggingFixture(fixtures.Fixture):
 
     def reset(self):
         self.calls.append('reset' + self.suffix)
+
+
+class NotHasattr(object):
+    """For asserting that an object does not have a particular attribute."""
+
+    def __init__(self, attr_name):
+        self._attr_name = attr_name
+
+    def __str__(self):
+        return 'NotHasattr(%s)' % (self._attr_name,)
+
+    def match(self, obj):
+        sentinel = object()
+        value = getattr(obj, self._attr_name, sentinel)
+        if value is not sentinel:
+            return Mismatch(
+                "%s is an attribute of %r: %r" % (
+                    self._attr_name, obj, value))