Unit test timeout when testing Firestore - firebase

Question

I have several unit tests to test different Repositories of collections in Firestore.
If I run the entire unit tests, the first two of the Firestore unit tests run fine without timeout, but the subsequent ones get timeout all the time.
If I run the failing ones each on its own (i.e. using describe.only()) then it runs just fine without getting any timeout.
In the firestore-debug.log, I see the following entries:
----------------------------------------------------------------------
[debug] [2019-12-25T04:29:17.643Z] Command: /usr/local/bin/node /usr/local/bin/firebase emulators:exec mocha --recursive
[debug] [2019-12-25T04:29:17.643Z] CLI Version: 7.9.0
[debug] [2019-12-25T04:29:17.643Z] Platform: darwin
[debug] [2019-12-25T04:29:17.643Z] Node Version: v12.13.1
[debug] [2019-12-25T04:29:17.647Z]
----------------------------------------------------------------------
[debug] [2019-12-25T04:29:17.647Z]
[debug] [2019-12-25T04:29:17.658Z] > command requires scopes: ["email","openid","https://www.googleapis.com/auth/cloudplatformprojects.readonly","https://www.googleapis.com/auth/firebase","https://www.googleapis.com/auth/cloud-platform"]
[debug] [2019-12-25T04:29:17.658Z] > authorizing via signed-in user
[info] i emulators: Starting emulators: functions, firestore, hosting
[warn] ⚠ Your requested "node" version "8" doesn't match your global version "12"
[info] ✔ functions: Emulator started at http://localhost:5001
[info] i firestore: Serving ALL traffic (including WebChannel) on http://localhost:5002
[warn] ⚠ firestore: Support for WebChannel on a separate port (5003) is DEPRECATED and will go away soon. Please use port above instead.
[debug] [2019-12-25T04:29:17.994Z] Ignoring unsupported arg: projectId
[debug] [2019-12-25T04:29:17.994Z] Ignoring unsupported arg: auto_download
[debug] [2019-12-25T04:29:17.994Z] Starting emulator firestore with command {"binary":"java","args":["-Duser.language=en","-jar","/Users/yoda/.cache/firebase/emulators/cloud-firestore-emulator-v1.10.2.jar","--host","localhost","--port",5002,"--rules","/Users/yoda/Projects/p0rnhub/service/firestore.rules","--functions_emulator","localhost:5001","--webchannel_port",5003],"optionalArgs":["port","webchannel_port","host","rules","functions_emulator"],"joinArgs":false}
[info] i firestore: Emulator logging to firestore-debug.log
[debug] [2019-12-25T04:29:19.869Z] API endpoint: http://
[debug] [2019-12-25T04:29:19.869Z] localhost:5002
If you are using a library that supports the FIRESTORE_EMULATOR_HOST environment variable, run:
export FIRESTORE_EMULATOR_HOST=localhost:
[debug] [2019-12-25T04:29:19.869Z] 5002
Dev App Server is now running.
[info] ✔ firestore: Emulator started at http://localhost:5002
[info] i firestore: For testing set FIRESTORE_EMULATOR_HOST=localhost:5002
[debug] [2019-12-25T04:29:20.035Z] > refreshing access token with scopes: ["email","https://www.googleapis.com/auth/cloud-platform","https://www.googleapis.com/auth/cloudplatformprojects.readonly","https://www.googleapis.com/auth/firebase","openid"]
[debug] [2019-12-25T04:29:20.036Z] >>> HTTP REQUEST POST https://www.googleapis.com/oauth2/v3/token
<request body omitted>
[debug] [2019-12-25T04:29:20.185Z] <<< HTTP RESPONSE 200
[debug] [2019-12-25T04:29:20.200Z] >>> HTTP REQUEST GET https://firebase.googleapis.com/v1beta1/projects/p0rnhub/webApps/-/config
[debug] [2019-12-25T04:29:21.157Z] <<< HTTP RESPONSE 200
[info] i hosting: Serving hosting files from: public
[info] ✔ hosting: Local server: http://localhost:5000
[info] ✔ hosting: Emulator started at http://localhost:5000
[info] i functions: Watching "/Users/yoda/Projects/p0rnhub/service/functions" for Cloud Functions...
[debug] [2019-12-25T04:29:21.435Z] [worker-~diagnostic~-8c5a2752-d4c3-408b-b55c-df1aba3f5987]: Assigning socketPath: /var/folders/h5/x3f6g38d1n5_wd1mrk8_ckm00000gn/T/fire_emu_67092.sock
[debug] [2019-12-25T04:29:21.435Z] [worker-~diagnostic~-8c5a2752-d4c3-408b-b55c-df1aba3f5987]: BUSY
[debug] [2019-12-25T04:29:21.804Z] [runtime-status] [67092] Functions runtime initialized. {"cwd":"/Users/yoda/Projects/p0rnhub/service/functions","node_version":"12.13.1"}
[debug] [2019-12-25T04:29:21.806Z] [runtime-status] [67092] Disabled runtime features: undefined
[debug] [2019-12-25T04:29:21.810Z] [runtime-status] [67092] Resolved module firebase-admin {"declared":true,"installed":true,"version":"8.8.0","resolution":"/Users/yoda/Projects/p0rnhub/service/functions/node_modules/firebase-admin/lib/index.js"}
[debug] [2019-12-25T04:29:21.812Z] [runtime-status] [67092] Resolved module firebase-functions {"declared":true,"installed":true,"version":"3.3.0","resolution":"/Users/yoda/Projects/p0rnhub/service/functions/node_modules/firebase-functions/lib/index.js"}
[debug] [2019-12-25T04:29:22.124Z] [runtime-status] [67092] Found google-gax at /Users/yoda/Projects/p0rnhub/service/functions/node_modules/google-gax/build/src/index.js
[debug] [2019-12-25T04:29:22.124Z] [runtime-status] [67092] Outgoing network have been stubbed. [{"name":"http","status":"mocked"},{"name":"http","status":"mocked"},{"name":"https","status":"mocked"},{"name":"https","status":"mocked"},{"name":"net","status":"mocked"},{"name":"google-gax","status":"mocked"}]
[debug] [2019-12-25T04:29:22.178Z] [runtime-status] [67092] Checked functions.config() {"config":{}}
[debug] [2019-12-25T04:29:22.179Z] [runtime-status] [67092] Resolved module firebase-functions {"declared":true,"installed":true,"version":"3.3.0","resolution":"/Users/yoda/Projects/p0rnhub/service/functions/node_modules/firebase-functions/lib/index.js"}
[debug] [2019-12-25T04:29:22.180Z] [runtime-status] [67092] Resolved module firebase-admin {"declared":true,"installed":true,"version":"8.8.0","resolution":"/Users/yoda/Projects/p0rnhub/service/functions/node_modules/firebase-admin/lib/index.js"}
[debug] [2019-12-25T04:29:22.180Z] [runtime-status] [67092] Resolved module firebase-functions {"declared":true,"installed":true,"version":"3.3.0","resolution":"/Users/yoda/Projects/p0rnhub/service/functions/node_modules/firebase-functions/lib/index.js"}
[debug] [2019-12-25T04:29:22.232Z] [runtime-status] [67092] firebase-admin has been stubbed. {"adminResolution":{"declared":true,"installed":true,"version":"8.8.0","resolution":"/Users/yoda/Projects/p0rnhub/service/functions/node_modules/firebase-admin/lib/index.js"}}
[info] ✔ functions[auth]: http function initialized (http://localhost:5001/p0rnhub/us-central1/auth).
[info] ✔ functions[token]: http function initialized (http://localhost:5001/p0rnhub/us-central1/token).
[info] ✔ functions[login]: http function initialized (http://localhost:5001/p0rnhub/us-central1/login).
[info] ✔ functions[start]: http function initialized (http://localhost:5001/p0rnhub/us-central1/start).
[info] ✔ functions[stop]: http function initialized (http://localhost:5001/p0rnhub/us-central1/stop).
[info] ✔ functions[list]: http function initialized (http://localhost:5001/p0rnhub/us-central1/list).
[info] i Running script: mocha --recursive
[debug] [2019-12-25T04:29:22.252Z] Running mocha --recursive with environment 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[debug] [2019-12-25T04:29:22.263Z] [worker-~diagnostic~-8c5a2752-d4c3-408b-b55c-df1aba3f5987]: exited
[debug] [2019-12-25T04:29:22.263Z] [worker-~diagnostic~-8c5a2752-d4c3-408b-b55c-df1aba3f5987]: FINISHED
[debug] [2019-12-25T04:29:23.385Z] Dec 25, 2019 11:29:23 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
INFO: Detected HTTP/2 connection.
[debug] [2019-12-25T04:29:24.429Z] Dec 25, 2019 11:29:24 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
INFO: Detected HTTP/2 connection.
[warn] ⚠ Script exited unsuccessfully (code 4)
[info] i Shutting down emulators.
[info] i Stopping functions emulator
[info] i Stopping firestore emulator
[debug] [2019-12-25T04:29:34.479Z] *** shutting down gRPC server since JVM is shutting down
[debug] [2019-12-25T04:29:34.482Z] *** server shut down
[info] i Stopping hosting emulator
[error]
[error] Error: Script "mocha --recursive" exited with code 4
Here's how I setup each Firestore unit test:
const assert = require("assert")
const firebase = require("#firebase/testing")
const { SampleRepository } = require("./SampleRepository")
const projectId = "a-project-id"
const app = firebase.initializeAdminApp({ projectId })
describe("SampleRepository", () => {
var db
var repository
before(async () => {
db = app.firestore()
repository = new SampleRepository(db)
})
afterEach(async () => {
await firebase.clearFirestoreData({ projectId })
})
after(async () => {
await db.terminate()
})
describe("firstMethod", () => {
it("use case 1", async () => {
// Do some testing here.
})
it("use case 2", async () => {
// Do some testing here.
})
})
describe("secondMethod", () => {
it("use case 1", async () => {
// Do some testing here.
})
})
})
I setup the npm test command to invoke this: firebase emulators:exec \"mocha --recursive\".
At this point, I am pretty clueless what causes this but I suspect it's a problem in the Firestore emulator or something? And I don't know what code 4 means in: Script exited unsuccessfully (code 4).
Any help is appreciated.
UPDATE 1: Now I know what the code 4 means. It means that I have 4 failing tests.