Cypress Testing: stuck at wait-on http://localhost:3000

Hi, I have an issue which I don’t quite understand. I’m currently new with Cypress+CircleCI together.

Using Cypress to do testing of my web app locally works fine. But when i want to set it up with CircleCI, I get stuck at “wait-on” step.

I worked on 2 different ways in setting up the circleci/config file file. But all ended up stuck at ‘wait-on’ step. And I get this message below and it is checked Green. But i’m not sure if the app is running in localhost or it exited before it runs the wait-on. I also have background: true in my second version. Can someone please guide me in this? Any suggestions on how to set this up properly? Below are my versions of the circleci/config file

Checked green

#!/bin/bash -eo pipefail
yarn start
yarn run v1.10.1
$ PORT=3000 react-scripts start
:information_source: 「wds」: Project is running at
:information_source: 「wds」: webpack output is served from
:information_source: 「wds」: Content not from webpack is served from /root/project/public
:information_source: 「wds」: 404s will fallback to /
Starting the development server…

Done in 1.40s.
CircleCI received exit code 0

First version config file

version: 2.1
  cypress: cypress-io/cypress@1
      - cypress/run:
          yarn: true
          install-command: 'yarn add firebase-tools --dev'
          start: yarn start
          wait-on: 'http://localhost:3000'
            - run: 'CI=false yarn build'
            - run: './node_modules/.bin/firebase deploy --token=$FIREBASE_TOKEN'

Second version config file

version: 2.1
CI: false
      - image: 'cypress/base:12'
    working_directory: ~/repo
      - checkout
      - restore_cache:
            - 'v1-dependencies-{{ checksum "package.json" }}'
            - v1-dependencies-
      - run: 'yarn install --frozen-lockfile'
      - run: 'yarn add firebase-tools --dev'
      - save_cache:
            - node_modules
          key: 'v1-dependencies-{{ checksum "package.json" }}'
      - run: 
          name: App in the background
          command: 'yarn start'
          background: true
      - run: 
          name: wait for localhost to load
          command: 'yarn wait-on http://localhost:3000'
      - run: 'yarn cy:run'
      - run: 'CI=false yarn build'
      - run: './node_modules/.bin/firebase deploy --token=$FIREBASE_TOKEN'

I found a solution. My problem was not caused by CircleCI or Cypress. It was mainly because of react-script 3.4.1 which fails to start.

Solution: Downgrade react-script to 3.4.0

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