Postman notifications on test failure

postman.js

pm.test("Successful status code [200, 201, 204]", function () {
    const goodStatusCodes = [200, 201, 204]

    // If there is a non-2xx failure, notify Slack:
    if(goodStatusCodes.indexOf(pm.response.code) === -1) {
         pm.sendRequest({
            url: 'https://hooks.slack.com/services/<<SLACK_URL_ID>>',
            method: 'POST',
            header: 'Content-type: application/json',
            body: {
                mode: 'raw',
                raw: JSON.stringify({ text:  ':rotating_light: "Postman Collection" test step failure:\n\n*' + pm.info.requestName + '* with a response code of `' + pm.response.code + '`' + '\n\n```' + pm.response.text() + '```' })
            }
        });
    }

    pm.expect(pm.response.code).to.be.oneOf(goodStatusCodes)
});