GitHub Actions上でFirestoreエミュレータを立ち上げてテストする

$ firebase init
(略)
? Which Firebase CLI features do you want to set up for this folder? Press Space to select features, then Enter to confirm your choices. 
Firestore: Deploy rules and create indexes for Firestore

=== Project Setup
(略)
? Please select an option: Use an existing project(ここでは既存のプロジェクトを選択していますが、新しく作っても以降の操作は同じです。)
(略)
=== Firestore Setup
(略)
? What file should be used for Firestore Rules? firestore.rules
(略)
? What file should be used for Firestore indexes? firestore.indexes.json

i  Writing configuration info to firebase.json...
i  Writing project information to .firebaserc...
i  Writing gitignore file to .gitignore...

✔  Firebase initialization complete!

$ firebase init
(略)
? Which Firebase CLI features do you want to set up for this folder? Press Space to select features, then Enter to confirm your choices. 
Emulators: Set up local emulators for Firebase features
(略)
=== Emulators Setup
? Which Firebase emulators do you want to set up? Press Space to select emulators, then Enter to confirm your choices. (Press <space> to select, <a> to toggle all, <i> to invert selection)
Firestore

? Which port do you want to use for the firestore emulator? 8080
? Would you like to download the emulators now? Yes

i  Writing configuration info to firebase.json...
i  Writing project information to .firebaserc...

✔  Firebase initialization complete!

   "firestore": {
     "rules": "firestore.rules",
     "indexes": "firestore.indexes.json"
+  },
+  "emulators": {
+    "firestore": {
+      "port": 8080
+    }
   }
 }

$ firebase emulators:start --only firestore
i  emulators: Starting emulators: firestore
i  firestore: Serving ALL traffic (including WebChannel) on http://localhost:8080
⚠  firestore: Support for WebChannel on a separate port (8081) is DEPRECATED and will go away soon. Please use port above instead.
i  firestore: Emulator logging to firestore-debug.log
✔  firestore: Emulator started at http://localhost:8080
i  firestore: For testing set FIRESTORE_EMULATOR_HOST=localhost:8080
✔  All emulators started, it is now safe to connect.

$ curl http:localhost:8080
Ok

rules_version = '2';
service cloud.firestore {
  match /databases/{database}/documents {
    match /projects/{projectID} {
      allow read, write: if resource.data.ownerId == request.auth.uid;
    }   
  }
}

import * as firebase from '@firebase/testing';

describe('/projects', () => {
    const uid = 'alice';
    const db = firebase.initializeTestApp({
        auth: { uid, email: '[email protected]' },
        projectId: 'my-test-project'
      }).firestore();
    const projectCollection = db.collection('projects');

  it('can not list all projects', async () => {
    await firebase.assertFails(projectCollection.get());
  });

  it('can list own projects', async () => {
    await firebase.assertSucceeds(
      projectCollection.where('ownerId', '==', uid).get()
    );
  });
});

FROM node:10-alpine
WORKDIR /usr/src/app
RUN apk add --no-cache openjdk8-jre
RUN npm i -g firebase-tools && firebase setup:emulators:firestore

version: '2'
services:
  firestore:
    build: .
    ports:
      - '8080:8080'
    volumes:
      - .:/usr/src/app
    working_dir: /usr/src/app
    command: 'firebase emulators:start --only firestore'

   "emulators": {
     "firestore": {
+      "host": "0.0.0.0",
       "port": 8080
     }
   }

$ docker-compose up firestore
Starting firebase-todoapp_firestore_1 ... done
Attaching to firebase-todoapp_firestore_1
firestore_1  | i  emulators: Starting emulators: firestore
firestore_1  | i  firestore: Serving ALL traffic (including WebChannel) on http://0.0.0.0:8080
firestore_1  | ⚠  firestore: Support for WebChannel on a separate port (8081) is DEPRECATED and will go away soon. Please use port above instead.
firestore_1  | i  firestore: Emulator logging to firestore-debug.log
firestore_1  | ✔  firestore: Emulator started at http://0.0.0.0:8080
firestore_1  | i  firestore: For testing set FIRESTORE_EMULATOR_HOST=0.0.0.0:8080
firestore_1  | ✔  All emulators started, it is now safe to connect.

name: Firebase CI

on: [push]

jobs:
  build:
    runs-on: ubuntu-latest

    strategy:
      matrix:
        node-version: [12.x]

    steps:
      - uses: actions/checkout@v1
      - name: docker-compose up
        run: docker-compose up -d
      - name: Use Node.js ${{ matrix.node-version }}
        uses: actions/setup-node@v1
        with:
          node-version: ${{ matrix.node-version }}
      - name: yarn install, build, and test
        run: |
          yarn install
          yarn tslint
          yarn test
          yarn build
        env:
          CI: true