Running Karma tests with VueJS single file component using Vueify - browserify

Question

I am trying to run my unit tests with Karma. I have calendar.tests.js file that looks a lot like this:
import { handleSelectDay } from '../components/Calendar/index.vue'
describe('Calendar', () => {
describe('handleSelectDay', () => {
const data = {};
describe('updates data', () => {
it('should set the selectedDay to a new id', () => {
handleSelectDay('id');
expect(data.daySelected).to.equal('id');
});
});
});
});
When I run this test with Karma I get the following: TypeError: (0 , _index.handleSelectDay) is not a function is not a function
My karma.conf.js looks like:
module.exports = function (config) {
config.set({
frameworks: ['browserify', 'mocha'],
files: ['static/js/apps/FutureHours/test/calender.tests.js'],
preprocessors: {
'static/js/apps/**/test/*.js': ['browserify']
},
browsers: ['Chrome'],
logLevel: 'LOG_DEBUG',
plugins: [
'karma-mocha',
'karma-browserify',
'karma-chrome-launcher',
'karma-spec-reporter'
],
browserify: {
debug: true,
transform: [['babelify', { presets: ['env'] }], 'vueify']
}
})
}
How can I get Karma to play nice with VueJS single file components?

Answer 1

The problem with this is you can't have a named export from a .vue component. Instead, any methods used in the component will have to accessed via the component object in a unit test. Any functions used outside the component's methods, should probably live in their own ES module to make unit testing them much easier.