[1.6.x] Fixed #20681 -- Prevented teardown_databases from attempting to tear down aliases

Thanks simonpercivall.

Backport of d9c580306c from master

1 files changed, 34 insertions, 0 deletions

diff --git a/tests/test_runner/tests.py b/tests/test_runner/tests.py
index b13d0e76fc..8b3d99f6d4 100644
--- a/tests/test_runner/tests.py
+++ b/tests/test_runner/tests.py
@@ -315,6 +315,40 @@ class AliasedDefaultTestSetupTest(unittest.TestCase):
             db.connections = old_db_connections
 
 
+class AliasedDatabaseTeardownTest(unittest.TestCase):
+    def test_setup_aliased_databases(self):
+        from django.db.backends.dummy.base import DatabaseCreation
+
+        runner_instance = runner.DiscoverRunner(verbosity=0)
+        old_db_connections = db.connections
+        old_destroy_test_db = DatabaseCreation.destroy_test_db
+        old_create_test_db = DatabaseCreation.create_test_db
+        try:
+            destroyed_names = []
+            DatabaseCreation.destroy_test_db = lambda self, old_database_name, verbosity=1: destroyed_names.append(old_database_name)
+            DatabaseCreation.create_test_db = lambda self, verbosity=1, autoclobber=False: self._get_test_db_name()
+
+            db.connections = db.ConnectionHandler({
+                'default': {
+                    'ENGINE': 'django.db.backends.dummy',
+                    'NAME': 'dbname',
+                },
+                'other': {
+                    'ENGINE': 'django.db.backends.dummy',
+                    'NAME': 'dbname',
+                }
+            })
+
+            old_config = runner_instance.setup_databases()
+            runner_instance.teardown_databases(old_config)
+
+            self.assertEqual(destroyed_names.count('dbname'), 1)
+        finally:
+            DatabaseCreation.create_test_db = old_create_test_db
+            DatabaseCreation.destroy_test_db = old_destroy_test_db
+            db.connections = old_db_connections
+
+
 class DeprecationDisplayTest(AdminScriptTestCase):
     # tests for 19546
     def setUp(self):