[FIX] bus: keep user log in debug mode tests

Before this commit, the current user was cleared after every
test. This is an issue since we can still interract with the
page after the test is done when in debug mode. This commit
fixes the issue by clearing the current user at the beginning
of each test instead of the end.

closes odoo/odoo#132801

Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>

addons/bus/static/tests/helpers/mock_python_environment.js

@@ -76,7 +76,6 @@ async function getModelDefinitions() {
 }
 
 let _cookie = {};
-QUnit.testDone(() => (_cookie = {}));
 export const pyEnvTarget = {
     cookie: {
         get(key) {
@@ -323,7 +322,10 @@ export async function startServer({ actions, views = {} } = {}) {
     });
     pyEnv["mockServer"] = await makeMockServer({ actions, models, views });
     pyEnv["mockServer"].pyEnv = pyEnv;
-    registerCleanup(() => (pyEnv = undefined));
+    registerCleanup(() => {
+        pyEnv = undefined;
+        _cookie = {};
+    });
     if ("res.users" in pyEnv.mockServer.models) {
         const adminUser = pyEnv["res.users"].searchRead([["id", "=", pyEnv.adminUserId]])[0];
         pyEnv.authenticate(adminUser.login, adminUser.password);