Could not find module `ember-resolver` imported from `AppName/resolver Ember tests

I am trying to run Ember tests and it gives this error saying Could not find module ember-resolver imported from `AppName/resolver.

I am not sure what is causing it. I am using Ember-cli-2.12.1. Any help would be appreciated. Thanks

I am answering this since i have resolved it and if someone come across this issue then they can solve it.

Steps i did to resolve it.

1. npm cache clear && bower cache clean && rm -rf node_modules bower_components && npm install && bower install

cleaned and reinstall Bower component and npm component.

2. ember init

Then I started getting error saying could not found module ember-qunit, after digging i found out that i had a lib called cropperjs from bower which was creating some conflict with ember-qunit whenever i import it in ember-cli-build.js , I moved cropperjs to npm node_modules and my tests started running.