Update documentation to reflect emulator is default for integration tests.
@@ -41,7 +41,33 @@ the source root.
Make sure you have created a Firestore instance for your project, before
you proceed.
-### Run on Local Emulator
+By default, integration tests run against the Firestore emulator.
+
+### Setting up the Firestore Emulator
+
+The integration tests require that the Firestore emulator is running on port
+8080, which is default when running it via CLI.
+
+ * [Install the Firebase CLI](https://firebase.google.com/docs/cli/).
+ ```
+ npm install -g firebase-tools
+ ```
+ * [Install the Firestore
+ emulator](https://firebase.google.com/docs/firestore/security/test-rules-emulator#install_the_emulator).
+ ```
+ firebase setup:emulators:firestore
+ ```
+ * Run the emulator
+ ```
+ firebase serve --only firestore
+ ```
+ * Select the `Firestore Integration Tests (Firestore Emulator)` run
+ configuration to run all integration tests.
+
+To run the integration tests against prod, select `FirestoreProdIntegrationTest`
+run configuration.
+
+### Run on Local Android Emulator
Then simply run:
```bash
