[fix] Fixed selenium tests

Author: pandafy

tests/testapp/tests/test_selenium.py

@@ -25,6 +25,13 @@ def setUp(self):
             username=self.admin_username, password=self.admin_password
         )
 
+    def tearDown(self):
+        # SeleniumTestMixin shares one browser (cls.web_driver) across every
+        # test method in the class; without clearing cookies here, a session
+        # left logged in by this test leaks into the next one and breaks its
+        # login()/logout() flow.
+        self.web_driver.delete_all_cookies()
+
     def _test_multitenant_autocomplete_org_field(
         self, username, password, path, visible, hidden
     ):