1 files changed, 47 insertions, 0 deletions
diff --git a/src/mailman/testing/database.py b/src/mailman/testing/database.py
new file mode 100644
index 000000000..b442031fa
--- /dev/null
+++ b/src/mailman/testing/database.py
@@ -0,0 +1,47 @@
+# Copyright (C) 2012 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Database test helpers."""
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'ResetHelper',
+    ]
+
+
+from mailman.model.version import Version
+
+
+
+class ResetHelper:
+    """Help with database resets; used by schema migrations."""
+
+    def __init__(self, version, store):
+        self.version = version
+        # Save the entry in the Version table for the test suite reset.  This
+        # will be restored below.
+        result = store.find(Version, component=version).one()
+        self.saved = result.version
+
+    def restore(self, store):
+        # We need to preserve the Version table entry for this migration,
+        # since its existence defines the fact that the tables have been
+        # loaded.
+        store.add(Version(component='schema', version=self.version))
+        store.add(Version(component=self.version, version=self.saved))