1 files changed, 9 insertions, 0 deletions
diff --git a/spec/frontend/editor/source_editor_markdown_livepreview_ext_spec.js b/spec/frontend/editor/source_editor_markdown_livepreview_ext_spec.js
index 1ff351b6554..19ebe0e3cb7 100644
--- a/spec/frontend/editor/source_editor_markdown_livepreview_ext_spec.js
+++ b/spec/frontend/editor/source_editor_markdown_livepreview_ext_spec.js
@@ -81,9 +81,18 @@ describe('Markdown Live Preview Extension for Source Editor', () => {
       },
       path: previewMarkdownPath,
       actionShowPreviewCondition: expect.any(Object),
+      eventEmitter: expect.any(Object),
     });
   });
 
+  it('support external preview trigger via emitter event', () => {
+    expect(panelSpy).not.toHaveBeenCalled();
+
+    instance.markdownPreview.eventEmitter.fire();
+
+    expect(panelSpy).toHaveBeenCalled();
+  });
+
   describe('onDidLayoutChange', () => {
     const emitter = new Emitter();
     let layoutSpy;