Update Firebase test project setup instructions.

Author: jonathanedey

CONTRIBUTING.md

@@ -162,44 +162,85 @@ pytest --cov=firebase_admin --cov=tests
 
 ### Integration Testing
 
-A suite of integration tests are available under the `integration/` directory.
-These tests are designed to run against an actual Firebase project. Create a new
-project in the [Firebase Console](https://console.firebase.google.com), if you
-do not already have one suitable for running the tests aginst. Then obtain the
-following credentials from the project:
-
-1. *Service account certificate*: This can be downloaded as a JSON file from
-   the "Settings > Service Accounts" tab of the Firebase console. Copy the
-   file into the repo so it's available at `cert.json`.
-2. *Web API key*: This is displayed in the "Settings > General" tab of the
-   console. Copy it and save to a new text file at `apikey.txt`.
-
-Then set up your Firebase/GCP project as follows:
-
-1. Enable Firestore: Go to the Firebase Console, and select "Database" from
-   the "Develop" menu. Click on the "Create database" button. You may choose
-   to set up Firestore either in the locked mode or in the test mode.
-2. Enable password auth: Select "Authentication" from the "Develop" menu in
-   Firebase Console. Select the "Sign-in method" tab, and enable the
-   "Email/Password" sign-in method, including the Email link (passwordless
-   sign-in) option.
-3. Enable the Firebase ML API: Go to the
-   [Google Developers Console](
-   https://console.developers.google.com/apis/api/firebaseml.googleapis.com/overview)
-   and make sure your project is selected. If the API is not already enabled, click Enable.
-4. Enable the IAM API: Go to the
-   [Google Cloud Platform Console](https://console.cloud.google.com) and make
-   sure your Firebase/GCP project is selected. Select "APIs & Services >
-   Dashboard" from the main menu, and click the "ENABLE APIS AND SERVICES"
-   button. Search for and enable the "Identity and Access Management (IAM)
-   API".
-5. Grant your service account the 'Firebase Authentication Admin' role. This is
-   required to ensure that exported user records contain the password hashes of
-   the user accounts:
-   1. Go to [Google Cloud Platform Console / IAM & admin](https://console.cloud.google.com/iam-admin).
-   2. Find your service account in the list, and click the 'pencil' icon to edit it's permissions.
-   3. Click 'ADD ANOTHER ROLE' and choose 'Firebase Authentication Admin'.
-   4. Click 'SAVE'.
+
+A suite of integration tests are available under the `integration/` directory. These tests
+are designed to run against an actual Firebase project. If you do not already have one
+suitable for running the tests against, you can create a new project in the
+[Firebase Console](https://console.firebase.google.com) following the setup guide below.
+Otherwise you can obtain the following credentials from your current project:
+
+
+1. Service account certificate: This can be downloaded as a JSON file from the
+**'Settings > Service Accounts'** tab of the Firebase console. Copy the file into the repo
+so it's available at `cert.json`.
+
+
+2. Web API key: This is displayed in the **'Settings > General'** tab of the Firebase console
+after enabling Authentication as described in the steps below. Copy it and save to a new text
+file at `apikey.txt`.
+
+
+Set up your Firebase project as follows:
+
+
+1. Enable Authentication:
+  1. Go to the Firebase Console, and select **'Authentication'** from the **'Build'** menu.
+  2. Click on **'Get Started'**.
+  3. Select **'Sign-in method > Add new provider > Email/Password'** then enable both the
+  **'Email/Password'** and **'Email link (passwordless sign-in)'** options.
+
+
+2. Enable Firestore:
+  1. Go to the Firebase Console, and select **'Firestore Database'** from the **'Build'** menu.
+  2. Click on the **'Create database'** button. You can choose to set up Firestore either in
+  the production mode or in the test mode.
+
+
+3. Enable Realtime Database:
+  1. Go to the Firebase Console, and select **'Realtime Database'** from the **'Build'** menu.
+  2. Click on the **'Create database'** button. You can choose to set up the Realtime database
+  either in the locked mode or in the test mode.
+  3. In the **'Data'** tab click on the kebab menu (3 dots) and select **'Create Database'**.
+  4. Enter your Project ID (Found in the **'General'** tab in **'Account Settings'**) as the
+  **'Realtime Database reference'**. Again, you can choose to set up the Realtime database
+  either in the locked mode or in the test mode.
+
+
+4. Enable Storage:
+  1. Go to the Firebase Console, and select **'Storage'** from the **'Build'** menu.
+  2. Click on the **'Get started'** button. You can choose to set up the Realtime database
+  either in the production mode or in the test mode.
+
+
+5. Enable the Firebase ML API:
+  1. Go to the [Google Developers Console | Firebase ML API](
+  https://console.developers.google.com/apis/api/firebaseml.googleapis.com/overview) and make
+  sure your project is selected.
+  2. If the API is not already enabled, click **'Enable'**.
+
+
+6. Enable the IAM API:
+  1. Go to the [Google Cloud Platform Console](https://console.cloud.google.com) and make sure
+  your Firebase project is selected.
+  2. Select **'APIs & Services'** from the main menu, and click the
+  **'ENABLE APIS AND SERVICES'** button.
+  3. Search for and enable **'Identity and Access Management (IAM) API'** by Google Enterprise API.
+
+
+7. Enable Tenant Management:
+  1. Go to
+  [Google Developers Console | Identity Platform](https://console.cloud.google.com/customer-identity/)
+  and if it is not already enabled, click **'Enable'**.
+  2. Then follow [this guide](https://cloud.google.com/identity-platform/docs/multi-tenancy-quickstart#enabling_multi-tenancy) to enable multi-tenancy.
+
+
+8. Ensure your service account has the **'Firebase Authentication Admin'** role. This is required
+to ensure that exported user records contain the password hashes of the user accounts:
+  1. Go to [Google Cloud Platform Console / IAM & admin](https://console.cloud.google.com/iam-admin).
+  2. Find your service account in the list. If not added click the **'pencil'** icon to edit its
+  permissions.
+  3. Click **'ADD ANOTHER ROLE'** and choose **'Firebase Authentication Admin'**.
+  4. Click **'SAVE'**.
 
 
 Now you can invoke the integration test suite as follows: