diff --git a/addons/mail/static/tests/tools/debug_manager_tests.js b/addons/mail/static/tests/tools/debug_manager_tests.js
index 7671150f0d8..c21d36572b9 100644
--- a/addons/mail/static/tests/tools/debug_manager_tests.js
+++ b/addons/mail/static/tests/tools/debug_manager_tests.js
@@ -28,7 +28,7 @@ QUnit.module('Mail DebugManager', {}, function () {
             },
         });
 
-        debugManager.appendTo($('#qunit-fixture'));
+        await debugManager.appendTo($('#qunit-fixture'));
 
         // Simulate update debug manager from web client
         var action = {
diff --git a/addons/web/static/tests/helpers/test_utils.js b/addons/web/static/tests/helpers/test_utils.js
index ccf5d8daf6b..460bd9f4f78 100644
--- a/addons/web/static/tests/helpers/test_utils.js
+++ b/addons/web/static/tests/helpers/test_utils.js
@@ -102,6 +102,7 @@ async function nextTick() {
 // to load xml files that are normally lazy loaded by specific widgets).
 return Promise.all([
     session.is_bound,
+    ajax.loadXML('/web/static/src/xml/debug.xml', core.qweb),
     ajax.loadXML('/web/static/src/xml/dialog.xml', core.qweb)
 ]).then(function () {
     setTimeout(function () {
diff --git a/addons/web/static/tests/tools/debug_manager_tests.js b/addons/web/static/tests/tools/debug_manager_tests.js
index 0de3d5857e0..0f850835c66 100644
--- a/addons/web/static/tests/tools/debug_manager_tests.js
+++ b/addons/web/static/tests/tools/debug_manager_tests.js
@@ -13,7 +13,7 @@ QUnit.module('DebugManager', {}, function () {
 
         var debugManager = createDebugManager();
 
-        debugManager.appendTo($('#qunit-fixture'));
+        await debugManager.appendTo($('#qunit-fixture'));
 
         // Simulate update debug manager from web client
         var action = {