diff --git a/lib/tc/test/__init__.py b/lib/tc/test/__init__.py
index 60722cd..d7e3f7a 100644
--- a/lib/tc/test/__init__.py
+++ b/lib/tc/test/__init__.py
@@ -3,9 +3,10 @@
 
 def suite():
   suites = []
-  import hdb, bdb
+  import hdb, bdb, tdb
   suites.append(hdb.suite())
   suites.append(bdb.suite())
+  suites.append(tdb.suite())
   return unittest.TestSuite(suites)
 
 def test(*va, **kw):
diff --git a/lib/tc/test/tdb.py b/lib/tc/test/tdb.py
index d6ddbcd..fe2b7ed 100644
--- a/lib/tc/test/tdb.py
+++ b/lib/tc/test/tdb.py
@@ -106,6 +106,36 @@ def testAll(self):
     self.assertEquals(pks[0], 'torgny')
     self.assertEquals(pks[1], 'rosa')
     self.assertEquals(pks[2], 'jdoe')
+    
+    q = db.query()
+    q.order('age', tc.TDBQONUMDESC)
+    # get thos with ages < 40
+    q.filter('age', tc.TDBQCNUMLE, '40')
+    pks = q.keys()
+    self.assertEquals(pks[0], 'torgny')
+    self.assertEquals(pks[1], 'rosa')
+    self.assertEquals(len(pks), 2)
+    
+    # add to the filter only those > 30 ( and < 40 from before)
+    q.filter('age', tc.TDBQCNUMGE, '30')
+    pks = q.keys()
+    self.assertEquals(pks[0], 'torgny')
+    self.assertEquals(len(pks), 1)
+    
+    # filter out those who have blue in the colors
+    q = db.query()
+    q.order('age', tc.TDBQONUMDESC)
+    q.filter('colors', tc.TDBQCSTRINC, 'blue')
+    pks = q.keys()
+    self.assertEquals(pks[0], 'torgny')
+    self.assertEquals(pks[1], 'rosa')
+    self.assertEquals(len(pks), 2)
+    
+    # add a filter to the existing:
+    q.filter('colors', tc.TDBQCSTRINC, 'pink')
+    pks = q.keys()
+    self.assertEquals(pks[0], 'rosa')
+    self.assertEquals(len(pks), 1)
   
 
 def suite():