improved test for orphan testing

lib/python/ZTUtils/tests/testBatch.py

@@ -44,9 +44,9 @@ class BatchTests(TestCase):
 
     def testLengthEqualsSizePlusOrphans(self):
         '''Test limit case where batch length is equal to size + orphans'''
-        for bsize in (12, 14):
+        for bsize, length in ((12,11), (13,12), (14,13), (15,10)):
             b = Batch(range(bsize), size=10, start=1, end=0, orphan=3, overlap=0)
-            assert b.length = b.sequence_length
+            assert length == b.length
     
 def test_suite():
     return makeSuite(BatchTests)