1 files changed, 75 insertions, 0 deletions
diff --git a/spec/frontend/content_editor/components/editor_state_observer_spec.js b/spec/frontend/content_editor/components/editor_state_observer_spec.js
new file mode 100644
index 00000000000..5e4bb348e1f
--- /dev/null
+++ b/spec/frontend/content_editor/components/editor_state_observer_spec.js
@@ -0,0 +1,75 @@
+import { shallowMount } from '@vue/test-utils';
+import { each } from 'lodash';
+import EditorStateObserver, {
+  tiptapToComponentMap,
+} from '~/content_editor/components/editor_state_observer.vue';
+import { createTestEditor } from '../test_utils';
+
+describe('content_editor/components/editor_state_observer', () => {
+  let tiptapEditor;
+  let wrapper;
+  let onDocUpdateListener;
+  let onSelectionUpdateListener;
+  let onTransactionListener;
+
+  const buildEditor = () => {
+    tiptapEditor = createTestEditor();
+    jest.spyOn(tiptapEditor, 'on');
+  };
+
+  const buildWrapper = () => {
+    wrapper = shallowMount(EditorStateObserver, {
+      provide: { tiptapEditor },
+      listeners: {
+        docUpdate: onDocUpdateListener,
+        selectionUpdate: onSelectionUpdateListener,
+        transaction: onTransactionListener,
+      },
+    });
+  };
+
+  beforeEach(() => {
+    onDocUpdateListener = jest.fn();
+    onSelectionUpdateListener = jest.fn();
+    onTransactionListener = jest.fn();
+    buildEditor();
+    buildWrapper();
+  });
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('when editor content changes', () => {
+    it('emits update, selectionUpdate, and transaction events', () => {
+      const content = '<p>My paragraph</p>';
+
+      tiptapEditor.commands.insertContent(content);
+
+      expect(onDocUpdateListener).toHaveBeenCalledWith(
+        expect.objectContaining({ editor: tiptapEditor }),
+      );
+      expect(onSelectionUpdateListener).toHaveBeenCalledWith(
+        expect.objectContaining({ editor: tiptapEditor }),
+      );
+      expect(onSelectionUpdateListener).toHaveBeenCalledWith(
+        expect.objectContaining({ editor: tiptapEditor }),
+      );
+    });
+  });
+
+  describe('when component is destroyed', () => {
+    it('removes onTiptapDocUpdate and onTiptapSelectionUpdate hooks', () => {
+      jest.spyOn(tiptapEditor, 'off');
+
+      wrapper.destroy();
+
+      each(tiptapToComponentMap, (_, tiptapEvent) => {
+        expect(tiptapEditor.off).toHaveBeenCalledWith(
+          tiptapEvent,
+          tiptapEditor.on.mock.calls.find(([eventName]) => eventName === tiptapEvent)[1],
+        );
+      });
+    });
+  });
+});