shallow-mount.spec.js

import { compileToFunctions } from 'vue-template-compiler'
import Vue from 'vue'
import { mount, shallowMount } from '~vue/test-utils'
import Component from '~resources/components/component.vue'
import ComponentWithChild from '~resources/components/component-with-child.vue'
import ComponentWithNestedChildren from '~resources/components/component-with-nested-children.vue'
import ComponentWithLifecycleHooks from '~resources/components/component-with-lifecycle-hooks.vue'
import ComponentWithoutName from '~resources/components/component-without-name.vue'
import ComponentAsAClassWithChild from '~resources/components/component-as-a-class-with-child.vue'
import RecursiveComponent from '~resources/components/recursive-component.vue'
import { vueVersion } from '~resources/utils'
import { describeRunIf } from 'conditional-specs'

describeRunIf(process.env.TEST_ENV !== 'node',
  'shallowMount', () => {
    let info

    beforeEach(() => {
      info = sinon.stub(console, 'info')
    })

    afterEach(() => {
      info.restore()
    })

    it('returns new VueWrapper of Vue localVue if no options are passed', () => {
      const compiled = compileToFunctions('<div><input /></div>')
      const wrapper = shallowMount(compiled)
      expect(wrapper.isVueComponent).to.equal(true)
      expect(wrapper.vm).to.be.an('object')
    })

    it('returns new VueWrapper of Vue localVue with all children stubbed', () => {
      const wrapper = shallowMount(ComponentWithNestedChildren)
      expect(wrapper.isVueComponent).to.equal(true)
      expect(wrapper.findAll(Component).length).to.equal(0)
      expect(wrapper.findAll(ComponentWithChild).length).to.equal(1)
    })

    it('returns new VueWrapper of Vue localVue with all children stubbed', () => {
      const wrapper = shallowMount(ComponentWithNestedChildren)
      expect(wrapper.isVueComponent).to.equal(true)
      expect(wrapper.findAll(Component).length).to.equal(0)
      expect(wrapper.findAll(ComponentWithChild).length).to.equal(1)
    })

    it('does not modify component directly', () => {
      const wrapper = shallowMount(ComponentWithNestedChildren)
      expect(wrapper.findAll(Component).length).to.equal(0)
      const mountedWrapper = mount(ComponentWithNestedChildren)
      expect(mountedWrapper.findAll(Component).length).to.equal(1)
    })

    it('stubs globally registered components when options.localVue is provided', () => {
      const localVue = Vue.extend()
      localVue.component('registered-component', ComponentWithLifecycleHooks)
      const Component = {
        render: h => h('registered-component')
      }
      shallowMount(Component, { localVue })
      mount(Component, { localVue })

      expect(info.callCount).to.equal(4)
    })

    it('stubs globally registered components', () => {
      Vue.component('registered-component', ComponentWithLifecycleHooks)
      const Component = {
        render: h => h('registered-component')
      }
      shallowMount(Component)
      mount(Component)

      expect(info.callCount).to.equal(4)
    })

    it('does not call stubbed children lifecycle hooks', () => {
      shallowMount(ComponentWithNestedChildren)
      expect(info.called).to.equal(false)
    })

    it('stubs extended components', () => {
      const ComponentWithPTag = {
        template: `<p></p>`
      }
      const BaseComponent = {
        template: `
        <div>
          <component-with-p-tag />
        </div>
      `,
        components: {
          ComponentWithPTag
        }
      }

      const TestComponent = {
        extends: BaseComponent
      }

      const wrapper = shallowMount(TestComponent)
      expect(wrapper.find(ComponentWithPTag).exists()).to.equal(true)
      expect(wrapper.find('p').exists()).to.equal(false)
    })

    it('stubs nested extended components', () => {
      const ComponentWithPTag = {
        template: `<p></p>`
      }
      const BaseComponent = {
        template: `
        <div>
          <component-with-p-tag />
        </div>
      `,
        components: {
          ComponentWithPTag
        }
      }

      const ExtendedBaseComponent = {
        extends: BaseComponent
      }

      const TestComponent = {
        extends: ExtendedBaseComponent
      }

      const wrapper = shallowMount(TestComponent)
      expect(wrapper.find(ComponentWithPTag).exists()).to.equal(true)
      expect(wrapper.find('p').exists()).to.equal(false)
    })

    it('stubs Vue class component children', () => {
      if (vueVersion < 2.3) {
        return
      }
      const wrapper = shallowMount(ComponentAsAClassWithChild)
      expect(wrapper.find(Component).exists()).to.equal(true)
      expect(wrapper.findAll('div').length).to.equal(1)
    })

    it('works correctly with find, contains, findAll, and is on unnamed components', () => {
      const TestComponent = {
        template: `
        <div>
            <component-without-name />
        </div>
      `,
        components: {
          ComponentWithoutName
        }
      }
      const wrapper = shallowMount(TestComponent)
      expect(wrapper.contains(ComponentWithoutName)).to.equal(true)
      expect(wrapper.find(ComponentWithoutName).exists()).to.equal(true)
      expect(wrapper.findAll(ComponentWithoutName).length).to.equal(1)
    })

    it('works correctly with find, contains, findAll, and is on named components', () => {
      const TestComponent = {
        template: `
        <div>
            <a-component />
        </div>
      `,
        components: {
          AComponent: Component
        }
      }
      const wrapper = shallowMount(TestComponent)
      expect(wrapper.contains(Component)).to.equal(true)
      expect(wrapper.find(Component).exists()).to.equal(true)
      expect(wrapper.findAll(Component).length).to.equal(1)
    })

    it('works correctly with find on recursive components', () => {
    // this is for a bug that I've been unable to replicate.
    // Sometimes components mutate their components, in this line—
      RecursiveComponent.components = {
        RecursiveComponent: { render: h => h('div') }
      }

      expect(shallowMount(RecursiveComponent, {
        propsData: {
          items: ['', '']
        }
      }).findAll(RecursiveComponent).length).to.equal(2)
      RecursiveComponent.components = {
        'recursive-component': { render: h => h('div') }
      }
      expect(shallowMount(RecursiveComponent, {
        propsData: {
          items: ['', '']
        }
      }).findAll(RecursiveComponent).length).to.equal(2)
    })

    it('throws an error when the component fails to mount', () => {
      expect(() => shallowMount({
        template: '<div></div>',
        mounted: function () {
          throw (new Error('Error'))
        }
      })).to.throw()
    })
  })