Firebase Stub: unit tests separated in different files

__mocks__/__tests__/gatsby-plugin-firebase/database.ref.off.test.js

@@ -0,0 +1,51 @@
+import { waitFor } from '@testing-library/react';
+import FirebaseStub, { DatabaseConstants } from '../../gatsby-plugin-firebase';
+
+test('removes event callbacks', async () => {
+  FirebaseStub.database().initializeData();
+
+  const userUid = DatabaseConstants.user1.uid;
+
+  let valueCallbackSnapshotValue = null;
+  const valueCallback = jest.fn((snapshot) => {
+    valueCallbackSnapshotValue = snapshot.val();
+  });
+  FirebaseStub.database()
+    .ref(DatabaseConstants.resumesPath)
+    .orderByChild('user')
+    .equalTo(userUid)
+    .on('value', valueCallback);
+  await waitFor(() => valueCallback.mock.calls[0][0]);
+  valueCallback.mockClear();
+  valueCallbackSnapshotValue = null;
+
+  let childRemovedCallbackSnapshotValue = null;
+  const childRemovedCallback = jest.fn((snapshot) => {
+    childRemovedCallbackSnapshotValue = snapshot.val();
+  });
+  FirebaseStub.database()
+    .ref(DatabaseConstants.resumesPath)
+    .orderByChild('user')
+    .equalTo(userUid)
+    .on('child_removed', childRemovedCallback);
+
+  const removedResume = (
+    await FirebaseStub.database()
+      .ref(
+        `${DatabaseConstants.resumesPath}/${DatabaseConstants.demoStateResume1Id}`,
+      )
+      .once('value')
+  ).val();
+  expect(removedResume).toBeTruthy();
+
+  FirebaseStub.database().ref(DatabaseConstants.resumesPath).off();
+
+  await FirebaseStub.database()
+    .ref(`${DatabaseConstants.resumesPath}/${removedResume.id}`)
+    .remove();
+
+  expect(childRemovedCallback.mock.calls).toHaveLength(0);
+  expect(childRemovedCallbackSnapshotValue).toBeNull();
+  expect(valueCallback.mock.calls).toHaveLength(0);
+  expect(valueCallbackSnapshotValue).toBeNull();
+});