1 files changed, 48 insertions, 0 deletions
diff --git a/tests/unit/test_fileutils.py b/tests/unit/test_fileutils.py
index c0bf0ac..7cd067c 100644
--- a/tests/unit/test_fileutils.py
+++ b/tests/unit/test_fileutils.py
@@ -15,10 +15,13 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import __builtin__
 import os
 import shutil
 import tempfile
 
+import mox
+
 from openstack.common import fileutils
 from tests import utils
 
@@ -34,3 +37,48 @@ class EnsureTree(utils.BaseTestCase):
         finally:
             if os.path.exists(tmpdir):
                 shutil.rmtree(tmpdir)
+
+
+class TestCachedFile(utils.BaseTestCase):
+
+    def setUp(self):
+        super(TestCachedFile, self).setUp()
+        self.mox = mox.Mox()
+        self.addCleanup(self.mox.UnsetStubs)
+
+    def test_read_cached_file(self):
+        self.mox.StubOutWithMock(os.path, "getmtime")
+        os.path.getmtime(mox.IgnoreArg()).AndReturn(1)
+        self.mox.ReplayAll()
+
+        fileutils._FILE_CACHE = {
+            '/this/is/a/fake': {"data": 1123, "mtime": 1}
+        }
+        fresh, data = fileutils.read_cached_file("/this/is/a/fake")
+        fdata = fileutils._FILE_CACHE['/this/is/a/fake']["data"]
+        self.assertEqual(fdata, data)
+
+    def test_read_modified_cached_file(self):
+        self.mox.StubOutWithMock(os.path, "getmtime")
+        self.mox.StubOutWithMock(__builtin__, 'open')
+        os.path.getmtime(mox.IgnoreArg()).AndReturn(2)
+
+        fake_contents = "lorem ipsum"
+        fake_file = self.mox.CreateMockAnything()
+        fake_file.read().AndReturn(fake_contents)
+        fake_context_manager = self.mox.CreateMockAnything()
+        fake_context_manager.__enter__().AndReturn(fake_file)
+        fake_context_manager.__exit__(mox.IgnoreArg(),
+                                      mox.IgnoreArg(),
+                                      mox.IgnoreArg())
+
+        __builtin__.open(mox.IgnoreArg()).AndReturn(fake_context_manager)
+
+        self.mox.ReplayAll()
+        fileutils._FILE_CACHE = {
+            '/this/is/a/fake': {"data": 1123, "mtime": 1}
+        }
+
+        fresh, data = fileutils.read_cached_file("/this/is/a/fake")
+        self.assertEqual(data, fake_contents)
+        self.assertTrue(fresh)