02-component-viemodel-tests.js

import { mount } from '@vue/test-utils';
import Counter from './Counter';

describe('Counter', () => {
  let component;
  beforeEach(() => {
    component = mount(Counter);
  });

  it('should emit value set to a specific number', () => {
    component.vm.setValue(5);
    expect(component.emitted('input')).toEqual([[5]]);
  });
  
  it('should emit value incremented by step', () => {
    component.vm.increment(10);
    expect(component.emitted('input')).toEqual([[10]]);
  });

  it('should emit value decremented by step', () => {
    component.vm.decrement(10);
    expect(component.emitted('input')).toEqual([[-10]]);
  });
});