Firebase Stub: unit tests separated in different files

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

@@ -0,0 +1,52 @@
+import FirebaseStub, { DatabaseConstants } from '../../gatsby-plugin-firebase';
+
+test('reuses existing Database instance', () => {
+  const database1 = FirebaseStub.database();
+  const database2 = FirebaseStub.database();
+
+  expect(database1.uuid).toBeTruthy();
+  expect(database2.uuid).toBeTruthy();
+  expect(database1.uuid).toEqual(database2.uuid);
+});
+
+test('ServerValue.TIMESTAMP returns current time in milliseconds', () => {
+  const now = new Date().getTime();
+  const timestamp = FirebaseStub.database.ServerValue.TIMESTAMP;
+
+  expect(timestamp).toBeTruthy();
+  expect(timestamp).toBeGreaterThanOrEqual(now);
+});
+
+test('initializing data sets up resumes and users', async () => {
+  FirebaseStub.database().initializeData();
+
+  const resumesRef = FirebaseStub.database().ref(DatabaseConstants.resumesPath);
+  const resumesDataSnapshot = await resumesRef.once('value');
+  const resumes = resumesDataSnapshot.val();
+  expect(resumes).toBeTruthy();
+  expect(Object.keys(resumes)).toHaveLength(3);
+  const demoStateResume1 = resumes[DatabaseConstants.demoStateResume1Id];
+  expect(demoStateResume1).toBeTruthy();
+  expect(demoStateResume1.id).toEqual(DatabaseConstants.demoStateResume1Id);
+  expect(demoStateResume1.user).toEqual(DatabaseConstants.user1.uid);
+  const demoStateResume2 = resumes[DatabaseConstants.demoStateResume2Id];
+  expect(demoStateResume2).toBeTruthy();
+  expect(demoStateResume2.id).toEqual(DatabaseConstants.demoStateResume2Id);
+  expect(demoStateResume2.user).toEqual(DatabaseConstants.user2.uid);
+  const initialStateResume = resumes[DatabaseConstants.initialStateResumeId];
+  expect(initialStateResume).toBeTruthy();
+  expect(initialStateResume.id).toEqual(DatabaseConstants.initialStateResumeId);
+  expect(initialStateResume.user).toEqual(DatabaseConstants.user1.uid);
+
+  const usersRef = FirebaseStub.database().ref(DatabaseConstants.usersPath);
+  const usersDataSnapshot = await usersRef.once('value');
+  const users = usersDataSnapshot.val();
+  expect(users).toBeTruthy();
+  expect(Object.keys(users)).toHaveLength(2);
+  const anonymousUser1 = users[DatabaseConstants.user1.uid];
+  expect(anonymousUser1).toBeTruthy();
+  expect(anonymousUser1).toEqual(DatabaseConstants.user1);
+  const anonymousUser2 = users[DatabaseConstants.user2.uid];
+  expect(anonymousUser2).toBeTruthy();
+  expect(anonymousUser2).toEqual(DatabaseConstants.user2);
+});