def METHOD_NAME(self):
    called = []
    dummy_txn = object()
    def store_func(oid, tid, data, txn):
        called.append((oid, tid, data, txn))
    fn = os.path.join(self.blob_dir, 'newblob')
    write_file(fn, 'here a blob')
    blobhelper = self._make_default()
    self.assertFalse(blobhelper.txn_has_blobs)
    blobhelper.storeBlob(None, store_func, test_oid, test_tid, 'blob pickle',
                         fn, '', dummy_txn)
    self.assertFalse(os.path.exists(fn))
    self.assertTrue(blobhelper.txn_has_blobs)
    self.assertEqual(called,
                     [(test_oid, test_tid, 'blob pickle', dummy_txn)])