[FIX] Get migration tests from module/migration/tests (#2207)

Author: kos94ok-3D

odoo/modules/loading.py

@@ -290,7 +290,7 @@ def load_test(idref, mode):
 
             # OpenUpgrade: run tests
             if os.environ.get('OPENUPGRADE_TESTS') and package.name is not None:
-                prefix = '.migrations.%s' % adapt_version(package.data['version'])
+                prefix = '.migrations'
                 registry.openupgrade_test_prefixes[package.name] = prefix
                 report.record_result(odoo.modules.module.run_unit_tests(module_name, openupgrade_prefix=prefix))
 

odoo/modules/module.py

@@ -587,18 +587,18 @@ def run(self, test):
 
 def run_unit_tests(module_name, position='at_install', openupgrade_prefix=None):
     """
-    :param openupgrade_prefix: extension to be able to insert '.migrations.<version>' to the path
-    of test files to be loaded (expecting tests in '<module_name>/migrations/<version>/tests/test_migration.py')
+    :param openupgrade_prefix: extension to be able to insert '.migrations' to the path
+    of test files to be loaded (expecting tests in '<module_name>/migrations/tests/test_migration.py')
     :returns: ``True`` if all of ``module_name``'s tests succeeded, ``False``
               if any of them failed.
     :rtype: bool
     """
     global current_test
-    from odoo.tests.common import TagsSelector # Avoid import loop
+    from odoo.tests.common import TagsSelector  # Avoid import loop
     current_test = module_name
     mods = get_test_modules(module_name, openupgrade_prefix=openupgrade_prefix)
     threading.currentThread().testing = True
-    config_tags = TagsSelector(tools.config['test_tags'])
+    config_tags = TagsSelector(tools.config['test_tags'] or '')
     position_tag = TagsSelector(position)
     r = True
     for m in mods: