From 03620da7ff3e99c7b506cf701ad4c28e631da811 Mon Sep 17 00:00:00 2001
From: Jonathan Lange <jml@canonical.com>
Date: Wed, 4 Jul 2012 19:04:32 +0100
Subject: Add a matcher, because I can't bear to write that code again.

---
 lib/fixtures/tests/_fixtures/test_tempdir.py     |  5 +++--
 lib/fixtures/tests/_fixtures/test_temphomedir.py |  5 +++--
 lib/fixtures/tests/helpers.py                    | 21 +++++++++++++++++++++
 3 files changed, 27 insertions(+), 4 deletions(-)

diff --git a/lib/fixtures/tests/_fixtures/test_tempdir.py b/lib/fixtures/tests/_fixtures/test_tempdir.py
index 1e42257..5fd5a46 100644
--- a/lib/fixtures/tests/_fixtures/test_tempdir.py
+++ b/lib/fixtures/tests/_fixtures/test_tempdir.py
@@ -23,13 +23,14 @@ from fixtures import (
     NestedTempfile,
     TempDir,
     )
+from fixtures.tests.helpers import NotHasattr
+
 
 class TestTempDir(testtools.TestCase):
 
     def test_basic(self):
         fixture = TempDir()
-        sentinel = object()
-        self.assertEqual(sentinel, getattr(fixture, 'path', sentinel))
+        self.assertThat(fixture, NotHasattr('path'))
         fixture.setUp()
         try:
             path = fixture.path
diff --git a/lib/fixtures/tests/_fixtures/test_temphomedir.py b/lib/fixtures/tests/_fixtures/test_temphomedir.py
index 339ce2c..5e0db9a 100644
--- a/lib/fixtures/tests/_fixtures/test_temphomedir.py
+++ b/lib/fixtures/tests/_fixtures/test_temphomedir.py
@@ -22,13 +22,14 @@ from fixtures import (
     TempDir,
     TempHomeDir,
     )
+from fixtures.tests.helpers import NotHasattr
+
 
 class TestTempDir(testtools.TestCase):
 
     def test_basic(self):
         fixture = TempHomeDir()
-        sentinel = object()
-        self.assertEqual(sentinel, getattr(fixture, 'path', sentinel))
+        self.assertThat(fixture, NotHasattr('path'))
         fixture.setUp()
         try:
             path = fixture.path
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))
-- 
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