I have a problem with unit test in angular. When i run ng test i have a errors with import scss.

This is an error:

./src/app/modules/auth/components/login/login.component.scss?ngResource - Error: Module build failed (from ./node_modules/sass-loader/dist/cjs.js):     
Can't find stylesheet to import.
 @import "styles"

And this is a scss file:

    @import "styles";

   .login-container {
    @extend .center-page;
}

Styles.scss:

@import "node_modules/angular-notifier/styles";

@import "./utils/variables";
@import "./utils/extends";
@import "./utils/mixins";

I try to different ways to import style files.