The solution for this is to include this in karma.conf.js:
files: [
'app/bower_components/angular/angular.js',
'app/bower_components/angular-mocks/angular-mocks.js', <--------- notice mocks here
'app/bower_components/angular-resource/angular-resource.js',
'app/bower_components/angular-cookies/angular-cookies.js',
'app/bower_components/angular-sanitize/angular-sanitize.js',
'app/bower_components/angular-route/angular-route.js',
'app/scripts/*.js',
'app/scripts/**/*.js',
'test/mock/**/*.js',
'test/spec/**/*.js'
],