Merge branch 'feature/frontend-unittests' into 'develop'

front/src/components/library/import/BatchDetail.vue

front/src/components/library/import/BatchList.vue

front/src/components/library/import/FileUpload.vue

front/src/components/library/import/ImportMixin.vue

front/src/components/library/import/TrackImport.vue

front/src/components/library/radios/Builder.vue

front/src/components/library/radios/Filter.vue

front/src/components/metadata/CardMixin.vue

front/src/config.js

front/src/main.js

front/src/store/auth.js

front/src/store/favorites.js

front/src/store/player.js

front/src/store/queue.js

front/src/store/radios.js

front/test/unit/karma.conf.js

front/test/unit/specs/Hello.spec.js

front/test/unit/specs/store/auth.spec.js

front/test/unit/specs/store/favorites.spec.js

front/test/unit/specs/store/player.spec.js