Add explicit test of v12 to v13 migration

tests/tools/archive/migration/test_v12_to_v13.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+###########################################################################
+# Copyright (c), The AiiDA team. All rights reserved.                     #
+# This file is part of the AiiDA code.                                    #
+#                                                                         #
+# The code is hosted on GitHub at https://github.com/aiidateam/aiida-core #
+# For further information on the license, see the LICENSE.txt file        #
+# For further information please visit http://www.aiida.net               #
+###########################################################################
+"""Test archive file migration from export version 0.12 to 0.13"""
+from aiida.storage.sqlite_zip.migrations.legacy.v12_to_v13 import migrate_v12_to_v13
+
+
+def test_migrate_v12_to_v13(core_archive, migrate_from_func):
+    """Test the data migration of transport entry point strings
+    e.g. from local to core.local.
+    """
+
+    # Migrate v0.12 to v0.13
+    _, data = migrate_from_func('export_0.12_simple.aiida', '0.12', '0.13', migrate_v12_to_v13, core_archive)
+
+    for values in data.get('export_data', {}).get('Computer', {}).values():
+        if 'transport_type' in values:
+            assert values['transport_type'] in [
+                'core.local',
+                'core.ssh',
+            ], (f"encountered illegal transport entry point string `{values['transport_type']}`")