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--- a
+++ b/Ming/ming/tests/test_datastore.py
@@ -0,0 +1,38 @@
+from unittest import TestCase, main
+
+import ming
+from ming import Session, Field, Document
+from ming import datastore as DS
+from ming import schema as S
+
+class TestDatastore(TestCase):
+
+    def setUp(self):
+        class TestDoc(Document):
+            class __mongometa__:
+                name='test_doc'
+                session = Session.by_name('main')
+            _id=Field(S.ObjectId, if_missing=None)
+            a=Field(S.Int, if_missing=None)
+            b=Field(S.Object, dict(a=S.Int(if_missing=None)))
+        config = {
+            'ming.main.master':'mongo://localhost:27017/test_db' }
+        ming.configure(**config)
+        self.session = TestDoc.__mongometa__.session
+
+    def test_basic(self):
+        self.assert_(repr(self.session.bind), 'DataStore(master=[{')
+        self.session.bind.conn
+
+    def test_master_slave(self):
+        ms = DS.DataStore(master='mongo://localhost:23/test_db',
+                          slave='mongo://localhost:27017/test_db')
+        ms.conn # should failover to slave-only
+        ms.db 
+        ms_fail = DS.DataStore(master='mongo://localhost:23/test_db')
+        self.assert_(ms_fail.conn is None)
+        
+
+if __name__ == '__main__':
+    main()
+