Method exec

tools/remoteDeviceTestRunner/browserstackTestRunner.js:258–268

            return result
          }
          const exec = cb =>
            execFunc(`async () => {
            await (${typeof cb === 'function' ? cb.toString() : cb})()
            return domSnapshots
          }`).then(result => {
              if (Array.isArray(result)) {
                const prettyHtml = require('../../src/fixtures/prettyHtml')
                return result.map(prettyHtml)
              }
              return result
            })
          test.context.config = {
            ...test.context.config,
            globals: {