Configure parallel tests with Javascript (Jest)

The following is sample of a buildspec.yml that shows parallel test execution with Javascript on an Ubuntu platform:

version: 0.2

batch:
  fast-fail: true
  build-fanout:
    parallelism: 5
    ignore-failure: false

phases:
  install:
    commands:
      - echo 'Installing Node.js dependencies'
      - apt-get update
      - apt-get install -y nodejs
      - npm install
      - npm install --save-dev jest-junit
  pre_build:
    commands:
      - echo 'prebuild'
  build:
    commands:
      - echo 'Running JavaScript Tests'
      - |
         codebuild-tests-run \
          --test-command "npx jest" \
          --files-search "codebuild-glob-search '**/test/**/*.test.js'" \
          --sharding-strategy 'stability'
    post_build:
      commands:
        - echo 'Test execution completed'