def METHOD_NAME(self):
    called = []
    dummy_txn = object()
    def store_func(oid, tid, data, txn):
        called.append((oid, tid, data, txn))
    fn1 = os.path.join(self.blob_dir, 'newblob')
    write_file(fn1, 'here a blob')
    fn2 = os.path.join(self.blob_dir, 'newblob2')
    write_file(fn2, 'there a blob')
    blobhelper = self._make_default()
    self.assertFalse(blobhelper.txn_has_blobs)
    blobhelper.storeBlob(None, store_func, test_oid, test_tid, 'blob pickle',
                         fn1, '', dummy_txn)
    blobhelper.storeBlob(None, store_func, test_oid, test_tid, 'blob pickle',
                         fn2, '', dummy_txn)
    self.assertFalse(os.path.exists(fn1))
    self.assertFalse(os.path.exists(fn2))
    self.assertTrue(blobhelper.txn_has_blobs)
    target_fn = blobhelper._txn_blobs[test_oid]
    self.assertEqual(read_file(target_fn), 'there a blob')