new file mode 100644
--- /dev/null
+++ b/examples/trac/trac/tests/env.py
@@ -0,0 +1,51 @@
+from trac import db_default
+from trac.env import Environment
+
+import os.path
+import unittest
+import tempfile
+import shutil
+
+
+class EnvironmentTestCase(unittest.TestCase):
+
+    def setUp(self):
+        env_path = os.path.join(tempfile.gettempdir(), 'trac-tempenv')
+        self.env = Environment(env_path, create=True)
+        self.db = self.env.get_db_cnx()
+
+    def tearDown(self):
+        self.db.close()
+        self.env.shutdown() # really closes the db connections
+        shutil.rmtree(self.env.path)
+
+    def test_get_version(self):
+        """Testing env.get_version"""
+        assert self.env.get_version() == db_default.db_version
+
+    def test_get_known_users(self):
+        """Testing env.get_known_users"""
+        cursor = self.db.cursor()
+        cursor.executemany("INSERT INTO session VALUES (%s,%s,0)",
+                           [('123', 0),('tom', 1), ('joe', 1), ('jane', 1)])
+        cursor.executemany("INSERT INTO session_attribute VALUES (%s,%s,%s,%s)",
+                           [('123', 0, 'email', 'a@example.com'),
+                            ('tom', 1, 'name', 'Tom'),
+                            ('tom', 1, 'email', 'tom@example.com'),
+                            ('joe', 1, 'email', 'joe@example.com'),
+                            ('jane', 1, 'name', 'Jane')])
+        users = {}
+        for username,name,email in self.env.get_known_users(self.db):
+            users[username] = (name, email)
+
+        assert not users.has_key('anonymous')
+        self.assertEqual(('Tom', 'tom@example.com'), users['tom'])
+        self.assertEqual((None, 'joe@example.com'), users['joe'])
+        self.assertEqual(('Jane', None), users['jane'])
+
+
+def suite():
+    return unittest.makeSuite(EnvironmentTestCase,'test')
+
+if __name__ == '__main__':
+    unittest.main(defaultTest='suite')