Revert "[Svelte] Remove test with intro options because svelte 4 doesn't support it (yet?)"

This reverts commit 882cbee.

Author: ChqThomas

src/Svelte/assets/test/render_controller.test.ts

@@ -85,4 +85,25 @@ describe('SvelteController', () => {
         await waitFor(() => expect(component).toHaveClass('mounted'));
         await waitFor(() => expect(component.innerHTML).toContain('<div><div>Hello without props</div></div>'));
     });
+
+    it('connect with props and intro', async () => {
+        const container = mountDOM(`
+          <div data-testid="component" id="container"
+              data-controller="check svelte"
+              data-svelte-component-value="SvelteComponent"
+              data-svelte-props-value="{&quot;name&quot;: &quot;Symfony with transition&quot;}"
+              data-svelte-intro-value="true" />
+        `);
+
+        const component = getByTestId(container, 'component');
+        expect(component).not.toHaveClass('connected');
+        expect(component).not.toHaveClass('mounted');
+
+        application = startStimulus();
+
+        await waitFor(() => expect(component).toHaveClass('connected'));
+        await waitFor(() => expect(component).toHaveClass('mounted'));
+        expect(component.innerHTML).toContain('style="animation:');
+        await waitFor(() => expect(component.innerHTML.trim()).toContain('<div>Hello Symfony with transition</div>'));
+    });
 });