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help: Plugins Inject Unit Test #576

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ariefsn opened this issue Nov 4, 2021 · 1 comment
Open

help: Plugins Inject Unit Test #576

ariefsn opened this issue Nov 4, 2021 · 1 comment
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@ariefsn
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ariefsn commented Nov 4, 2021

📚 What are you trying to do? Please describe.
Hi,
how to mock injection?
injection was working fine, but its become undefined when running test.
Nuxt2 + Typescript + CompositionApi

// plugins/myPlugin.ts
const utility: Plugin = (context, inject) => {
  inject('myFunc', (str: string) => str)
}

export default utility
// components/MyComponent.vue
setup() {
   const { $myFunc } = useContext()

   onMounted(() => {
      console.log('myFunc', $myfunc) // will print undefined on testing
   })
}
// test/MyComponent.spec.ts
const wrapper = mount(MyComponent, {
   localVue,
   mocks: {
      $myFunc: (str: string) => str
   }
})

🔍 What have you tried?
Have mocks in options, still not works.

ℹ️ Additional context

@BryceBarbara
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BryceBarbara commented Apr 12, 2024

I would mock the return value of useContext(). The exact approach will differ depending on the testing library you're using. My examples with be when using Vitest.

To mock it when it's used as a global:

const useContextMock: Mock<any, any> = vi.fn().mockImplementation(() => {
  return { $myFunc: (str: string) => str }
})
vi.stubGlobal('useContext', useContextMock)

// And to change the implementation for a specific test
useContextMock.mockImplementation(() => {
  return { $myFunc: (str: string) => `Changed - ${str}` }
})

To mock it when it's imported directly:

import { useContext } from '@nuxtjs/composition-api'

vi.mock('@nuxtjs/composition-api', () => {
  return {
    useContext: vi.fn().mockImplementation(() => {
      return { $myFunc: (str: string) => str }
    }),
  }
})

// And to change the implementation for a specific test
vi.mocked(useContext).mockImplementation(() => {
  return { $myFunc: (str: string) => `Changed - ${str}` }
})

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