fix mint tests import failure for helpers

[prakashsvmx]

Install minio package globally (npm install -g minio) and swap the imports to test locally

Local test code

replace Line numbers 32-37 with the following because during development the import should be from within package.

let helpers
try{
 helpers = require('minio/dist/main/helpers')
}catch (err){
  helpers=  require("../../../dist/main/helpers")
}