Github ActionsでdevelopブランチにPullRequestが作成されたタイミングでテストを実行してみる。

GithubのActionsタブから新しいActionを追加する

# .github/workflows/実行するアクションの名前.ymlでファイルを作る
$ touch .github/workflows/run-tests-on-pr-towards-develop.yml

.github/workflows/run-tests-on-pr-towards-develop.yml

name: Run Tests on PR towards develop branch

# Controls when the action will run.
on:
  # Triggers the workflow on pull request events but only for the develop branch
  pull_request:
    branches: [ develop ]

# A workflow run is made up of one or more jobs that can run sequentially or in parallel
jobs:
  # This workflow contains a single job called "build"
  build:
    # The type of runner that the job will run on
    runs-on: ubuntu-latest

    # Steps represent a sequence of tasks that will be executed as part of the job
    steps:
      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
      - uses: actions/checkout@v2

      - name: Install npm packages
        run: npm install
      - name: Run Tests
        run: npm run test