Testing Components

hi everyone, i’m working on testing a few components and i’m getting a few warnings. can anyone give me any insight into how to resolve this warnings, i’m using karma, along with webpack:

WARNING in ./~/ionic-angular/components/slides/swiper/swiper-controller.js (Emitted value instead of an instance of Error) Cannot find source file 'swiper-controller.ts': Error: Can't resolve './swiper-controller.ts' in '/Users/...../node_modules/ionic-angular/components/slides/swiper'