Firebase Stub: unit tests separated in different files

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

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+import { waitFor } from '@testing-library/react';
+import FirebaseStub, { DatabaseConstants } from '../../gatsby-plugin-firebase';
+
+test('can spy on it', async () => {
+  FirebaseStub.database().initializeData();
+
+  const referencePath = `${DatabaseConstants.resumesPath}/123456`;
+  const functionSpy = jest.spyOn(
+    FirebaseStub.database().ref(referencePath),
+    'update',
+  );
+  const updateArgument = 'test value 123';
+
+  await FirebaseStub.database().ref(referencePath).update(updateArgument);
+
+  expect(functionSpy).toHaveBeenCalledTimes(1);
+  const functionCallArgument = functionSpy.mock.calls[0][0];
+  expect(functionCallArgument).toBeTruthy();
+  expect(functionCallArgument).toEqual(updateArgument);
+});
+
+test('updates data', async () => {
+  FirebaseStub.database().initializeData();
+
+  const resumeId = DatabaseConstants.demoStateResume1Id;
+  const existingResume = (
+    await FirebaseStub.database()
+      .ref(`${DatabaseConstants.resumesPath}/${resumeId}`)
+      .once('value')
+  ).val();
+  expect(existingResume).toBeTruthy();
+
+  const resumeName = 'Test Resume renamed';
+  existingResume.name = resumeName;
+  await FirebaseStub.database()
+    .ref(`${DatabaseConstants.resumesPath}/${resumeId}`)
+    .update(existingResume);
+
+  const actualResume = (
+    await FirebaseStub.database()
+      .ref(`${DatabaseConstants.resumesPath}/${resumeId}`)
+      .once('value')
+  ).val();
+  expect(actualResume).toBeTruthy();
+  expect(existingResume).toEqual(actualResume);
+  expect(actualResume.name).toEqual(resumeName);
+});
+
+test('triggers events', async () => {
+  FirebaseStub.database().initializeData();
+
+  let snapshotValue = null;
+  const callback = jest.fn((snapshot) => {
+    snapshotValue = snapshot.val();
+  });
+  FirebaseStub.database()
+    .ref(DatabaseConstants.resumesPath)
+    .orderByChild('user')
+    .equalTo(DatabaseConstants.user1.uid)
+    .on('value', callback);
+  await waitFor(() => callback.mock.calls[0][0]);
+  callback.mockClear();
+  snapshotValue = null;
+
+  const existingResume = (
+    await FirebaseStub.database()
+      .ref(
+        `${DatabaseConstants.resumesPath}/${DatabaseConstants.demoStateResume1Id}`,
+      )
+      .once('value')
+  ).val();
+  expect(existingResume).toBeTruthy();
+
+  existingResume.name = 'Test Resume renamed';
+  await FirebaseStub.database()
+    .ref(`${DatabaseConstants.resumesPath}/${existingResume.id}`)
+    .update(existingResume);
+
+  await waitFor(() => callback.mock.calls[0][0]);
+
+  expect(callback.mock.calls).toHaveLength(1);
+  expect(snapshotValue).not.toBeNull();
+  expect(Object.keys(snapshotValue)).toHaveLength(2);
+  expect(snapshotValue[existingResume.id]).toBeTruthy();
+  expect(snapshotValue[existingResume.id]).toEqual(existingResume);
+});