update integration tests and CONTRIBUTING.md

Author: stephenarosaj

CONTRIBUTING.md

@@ -245,6 +245,50 @@ to ensure that exported user records contain the password hashes of the user acc
    3. Click **ADD ANOTHER ROLE** and choose **Firebase Authentication Admin**.
    4. Click **SAVE**.
 
+9. Setup your project for Firebase Data Connect integration tests:
+   1. Set up Data Connect in the Firebase Console:
+      1. Go to the Firebase Console, and select **Data Connect** from the **Build** menu.
+      2. Click on **Get Started**. You can skip any Gemini generation of your schema 
+         or operations - you must create these manually.
+      3. Select **Create a new Cloud SQL instance**.
+      4. Set your **Location** to `us-west2`
+      5. Set your **Cloud SQL instance ID** to `my-instance`
+      6. Set your **Database name** to `my-database`
+      7. Set your **Service ID** to `my-service`
+      8. Click **Submit**. This operation may take up to 10 minutes to complete.
+   2. Set up your Data Connect schema locally (currently there is no way to 
+      create/edit your schema from the Console):
+      1. Run the following commands from the command line to setup your data connect app:
+         ```bash
+         $ mkdir fdc-integration-test
+         $ cd fdc-integration-test
+         $ firebase init dataconnect --project <PROJECT_ID>
+         ```
+      2. The setup script should say **"Your project already has existing services."** 
+         Select the service you just created, `us-west2/my-service`.
+      3. When asked to use an app template, select `no`.
+      4. The set up should complete, and should have created a file `fdc-integration-test/dataconnect/schema/schema.gql`.
+      5. Paste the following lines into `schema.gql`:
+         ```gql
+         type User @table(key: ["id"]) {
+            id: String!
+            name: String!
+            address: String!
+         }
+         
+         type Email @table {
+            id: String!
+            subject: String!
+            date: Date!
+            text: String!
+            from: User!
+         }
+         ```
+      6. Run the following commands from `fdc-integration-test/` to setup your data connect app:
+         ```bash
+         $ firebase deploy --only dataconnect
+         ```
+      7. When asked if you'd like to execute changes, select `Execute all`.
 
 Finally, to run the integration test suite: