Vue Jest

• Testing library is @vue/test-utils
• Mount comonents with shallowMount and mount

shallowMount(component, {
  propsData: {},
  data: {},
})

Arrange methods

• .find(selector)
• .findAll(selector)
• .setData(), .setProps()
• .props()

Act methods

• .trigger(event)
• .setValue() / setChecked() / setSelected()

Assert methods

• .text()
• .exists()
• .emitted(event)
• .contains(selector)
• .isVisible()
• .classes()
• .attributes.()

Escape hatches:

• .vm - Access to the component object
• .element - Access to the underlying DOM element
• .html - Access to the underlying HTML element

import { shallowMount } from "@vue/test-utils";
import HelloWorld from "@/components/HelloWorld.vue";

describe("Emitting", () => {
  it("emits", () => {
    const component = shallowMount(HelloWorld);
    component.find("button").trigger("click");
    expect(component.emitted().pizza).toBeTruthy();
  });
});