Uncaught TypeError: $(...).dragsort is not a function thrown Jasmine Unit Test

I am testing an Angular App but in whole Application i am facing this issue as

Uncaught TypeError: $(...).dragsort is not a function thrown

I have included jQuery in my Karma.config.js as below

files: [
      { pattern: './node_modules/jquery/dist/jquery.min.js', watched: true }, 
      { pattern: './src/assets/js/jquery.dragsort.js', watched: true , included: false}, 
    ]

Note : Other jQuery function it is calling so the problem is related only to dragsort function . Can anyone help me to overcome this issue ?