diff --git a/packages/devextreme/js/__internal/ui/chat/chat_message_box.ts b/packages/devextreme/js/__internal/ui/chat/chat_message_box.ts
index e438525fbf56..f4ef40a56520 100644
--- a/packages/devextreme/js/__internal/ui/chat/chat_message_box.ts
+++ b/packages/devextreme/js/__internal/ui/chat/chat_message_box.ts
@@ -65,7 +65,6 @@ class MessageBox extends Widget<MessageBoxProperties> {
       activeStateEnabled,
       focusStateEnabled,
       hoverStateEnabled,
-      // TODO: Add tests for new default options
       stylingMode: 'outlined',
       placeholder: 'Type a message',
       autoResizeEnabled: true,
diff --git a/packages/devextreme/testing/tests/DevExpress.ui.widgets/chatParts/messageBox.tests.js b/packages/devextreme/testing/tests/DevExpress.ui.widgets/chatParts/messageBox.tests.js
index 026cdb0843c2..49a515008f8f 100644
--- a/packages/devextreme/testing/tests/DevExpress.ui.widgets/chatParts/messageBox.tests.js
+++ b/packages/devextreme/testing/tests/DevExpress.ui.widgets/chatParts/messageBox.tests.js
@@ -201,4 +201,20 @@ QUnit.module('MessageBox', moduleConfig, () => {
             });
         });
     });
+
+    QUnit.module('TextArea integration', () => {
+        QUnit.test('TextArea should have correct options', function(assert) {
+            const expectedOptions = {
+                stylingMode: 'outlined',
+                placeholder: 'Type a message',
+                autoResizeEnabled: true,
+            };
+
+            const textArea = TextArea.getInstance(this.$textArea);
+
+            Object.entries(expectedOptions).forEach(([key, value]) => {
+                assert.deepEqual(value, textArea.option(key), `textarea ${key} value is correct`);
+            });
+        });
+    });
 });