npm - Multiple versions of the same package using npmjs -

anyone knows trick install multiple versions of same package through npmjs ? know it's not possible use same package-name in package.json gives idea of try achieve:

"dependencies": {    "mypackage": "user/mypackage#v1.0",    "mypackage": "user/mypackage#v2.0"  }

at end, want a/b test package different versions. lot !

based on npm discussion, won't implemented time soon.

some reference:

• https://github.com/npm/npm/issues/5499
• https://github.com/npm/npm/issues/2943