Add emulator-based integration tests.

Author: yuchenshi

.github/workflows/ci.yml

@@ -17,10 +17,16 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
-    - name: Install, build and test
+    - name: Install and build
       run: |
         npm ci
         npm run build
         npm run build:tests
+    - name: Lint and run unit tests
+      run: |
         npm test
         npm run api-extractor
+    - name: Run emulator-based integration tests
+      run: |
+        npm install -g firebase-tools
+        npm run integration:emulator

CONTRIBUTING.md

@@ -123,6 +123,8 @@ There are two test suites: unit and integration. The unit test suite is intended
 development, and the integration test suite is intended to be run before packaging up release
 candidates.
 
+#### Unit Tests
+
 To run the unit test suite:
 
 ```bash
@@ -135,7 +137,25 @@ If you wish to skip the linter, and only run the unit tests:
 $ npm run test:unit
 ```
 
-The integration tests run against an actual Firebase project. Create a new
+#### Integration Tests with Emulator Suite
+
+Some of the integration tests work with the Emulator Suite and you can run them
+without an actual Firebase project.
+
+First, make sure to [install Firebase CLI](https://firebase.google.com/docs/cli#install_the_firebase_cli).
+And then:
+
+```bash
+npm integration:emulator
+```
+
+Currently, only the Auth, Database, and Firestore test suites work. Some test
+cases will be automatically skipped due to lack of emulator support. The section
+below covers how to run the full test suite against an actual Firebase project.
+
+#### Integration Tests with an actual Firebase project
+
+Other integration tests require 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 against. Then obtain the
 following credentials from the project:

package.json

@@ -15,8 +15,10 @@
     "lint": "run-p lint:src lint:test",
     "test": "run-s lint test:unit",
     "integration": "run-s build test:integration",
+    "integration:emulator": "run-s build test:integration:emulator",
     "test:unit": "mocha test/unit/*.spec.ts --require ts-node/register",
     "test:integration": "mocha test/integration/*.ts --slow 5000 --timeout 20000 --require ts-node/register",
+    "test:integration:emulator": "firebase emulators:exec --project fake-project-id --only auth,database,firestore 'mocha \"test/integration/{auth,database,firestore}.spec.ts\" --slow 5000 --timeout 20000 --require ts-node/register'",
     "test:coverage": "nyc npm run test:unit",
     "lint:src": "eslint src/ --ext .ts",
     "lint:test": "eslint test/ --ext .ts",

test/integration/database.spec.ts

@@ -17,7 +17,7 @@
 import * as admin from '../../lib/index';
 import * as chai from 'chai';
 import * as chaiAsPromised from 'chai-as-promised';
-import { defaultApp, nullApp, nonNullApp, cmdArgs, databaseUrl } from './setup';
+import { defaultApp, nullApp, nonNullApp, cmdArgs, databaseUrl, isEmulator } from './setup';
 
 // eslint-disable-next-line @typescript-eslint/no-var-requires
 const chalk = require('chalk');
@@ -64,7 +64,13 @@ describe('admin.database', () => {
       .should.eventually.be.fulfilled;
   });
 
-  it('App with null auth overrides is blocked by security rules', () => {
+  it('App with null auth overrides is blocked by security rules', function () {
+    if (isEmulator) {
+      // RTDB emulator has open security rules by default and won't block this.
+      // TODO(https://github.com/firebase/firebase-admin-node/issues/1149):
+      //     remove this once updating security rules through admin is in place.
+      return this.skip();
+    }
     return nullApp.database().ref('blocked').set(admin.database.ServerValue.TIMESTAMP)
       .should.eventually.be.rejectedWith('PERMISSION_DENIED: Permission denied');
   });
@@ -157,13 +163,21 @@ describe('admin.database', () => {
     });
   });
 
-  it('admin.database().getRules() returns currently defined rules as a string', () => {
+  it('admin.database().getRules() returns currently defined rules as a string', function () {
+    if (isEmulator) {
+      // https://github.com/firebase/firebase-admin-node/issues/1149
+      return this.skip();
+    }
     return admin.database().getRules().then((result) => {
       return expect(result).to.be.not.empty;
     });
   });
 
-  it('admin.database().getRulesJSON() returns currently defined rules as an object', () => {
+  it('admin.database().getRulesJSON() returns currently defined rules as an object', function () {
+    if (isEmulator) {
+      // https://github.com/firebase/firebase-admin-node/issues/1149
+      return this.skip();
+    }
     return admin.database().getRulesJSON().then((result) => {
       return expect(result).to.be.not.undefined;
     });