Add unit test

Author: fzaninotto

packages/ra-ui-materialui/src/button/SaveButton.spec.tsx

@@ -23,6 +23,7 @@ import { AdminContext } from '../AdminContext';
 import {
     AlwaysEnable,
     Basic,
+    Dirty,
     ComplexForm,
     EnabledWhenFormIsPrefilled,
 } from './SaveButton.stories';
@@ -69,6 +70,15 @@ describe('<SaveButton />', () => {
         );
     });
 
+    it('should render an enabled button when the form is dirty', async () => {
+        render(<Dirty />);
+        await waitFor(() =>
+            expect(screen.getByLabelText('ra.action.save')['disabled']).toEqual(
+                false
+            )
+        );
+    });
+
     it('should render as submit type by default', async () => {
         render(<Basic />);
         await waitFor(() =>