title: How to execute npm script using grunt-run?
body: <p>I have a npm task in my package.json file as follows to execute jest testing:</p>
  
  <pre><code>  "scripts": {
      "test-jest": "jest",
      "jest-coverage": "jest --coverage"
    },
    "jest": {
      "testEnvironment": "jsdom"
    },
  </code></pre>
  
  <p>I want to execute this task <code>npm run test-jest</code> using grunt. I installed grunt-run for the same and added the run task, but how do I invoke this npm task there?</p>
  
  <pre><code>    run: {
          options: {
            // Task-specific options go here.
          },
          your_target: {
            cmd: 'node'
          }
        }
  </code></pre>