yams #4921 Two test failures [resolved]

trace:

======================  unittest_schema2dot.py  ======================
unhandled exception occured while testing unittest_schema2dot
Traceback (most recent call last):
 File "/home/auc/rep/public/logilab/common/pytest.py", line 272, in testfile
   testprog = testlib.unittest_main(modname, batchmode=batchmode, cvg=self.cvg)
 File "/home/auc/rep/public/logilab/common/testlib.py", line 810, in unittest_main
   return SkipAwareTestProgram(module, defaultTest, batchmode, cvg)
 File "/home/auc/rep/public/logilab/common/testlib.py", line 637, in __init__
   testLoader=NonStrictTestLoader())
 File "/usr/lib/python2.4/unittest.py", line 746, in __init__
   self.module = __import__(module)
 File "unittest_schema2dot.py", line 8, in ?
   from yams import SchemaLoader
ImportError: cannot import name SchemaLoader
======================  unittest_schema2sql.py  ======================
unhandled exception occured while testing unittest_schema2sql
Traceback (most recent call last):
 File "/home/auc/rep/public/logilab/common/pytest.py", line 272, in testfile
   testprog = testlib.unittest_main(modname, batchmode=batchmode, cvg=self.cvg)
 File "/home/auc/rep/public/logilab/common/testlib.py", line 810, in unittest_main
   return SkipAwareTestProgram(module, defaultTest, batchmode, cvg)
 File "/home/auc/rep/public/logilab/common/testlib.py", line 637, in __init__
   testLoader=NonStrictTestLoader())
 File "/usr/lib/python2.4/unittest.py", line 746, in __init__
   self.module = __import__(module)
 File "unittest_schema2sql.py", line 9, in ?
   from yams import SchemaLoader
ImportError: cannot import name SchemaLoader
====================  unittest_schema_readers.py  ====================