app_vue2/tests/unit/services/connection/connection.spec.ts

import { NuxtAxiosInstance } from '@nuxtjs/axios'
import Connection from '~/services/connection/connection'
import axios from '~/plugins/Data/axios'
import { HTTP_METHOD, QUERY_TYPE } from '~/types/enums'

let $connection:any
const axiosMock = axios as jest.Mocked<NuxtAxiosInstance>

beforeAll(() => {
  $connection = new Connection()
  Connection.initConnector(axiosMock)
})

describe('invoke()', () => {
  it('should throw an error if the method is unknown', () => {
    expect(() => $connection.invoke('GETS', 'users', { type: QUERY_TYPE.MODEL })).toThrow()
  })

  describe('getItem()', () => {
    it('should return item data', async () => {
      Connection.connector.$request = jest.fn().mockReturnValue({ data: 'data user 1' })
      const response = await $connection.invoke(HTTP_METHOD.GET, 'users', { type: QUERY_TYPE.MODEL })
      expect(response).toStrictEqual({ data: 'data user 1' })
    })

    it('should call getItem', async () => {
      $connection.getItem = jest.fn().mockReturnValue({})
      await $connection.invoke(HTTP_METHOD.GET, 'users', { type: QUERY_TYPE.MODEL, id: 1 })
      expect($connection.getItem).toHaveBeenCalled()
    })
  })

  describe('getCollection()', () => {
    it('should return collection data', async () => {
      Connection.connector.$request = jest.fn().mockReturnValue([{ data: 'data user 1' }, { data: 'data user 2' }])
      const response = await $connection.invoke(HTTP_METHOD.GET, 'users', { type: QUERY_TYPE.MODEL })
      expect(response).toStrictEqual([{ data: 'data user 1' }, { data: 'data user 2' }])
    })
    it('should call getCollection and return collection data', async () => {
      $connection.getCollection = jest.fn().mockReturnValue({})
      await $connection.invoke(HTTP_METHOD.GET, 'users', { type: QUERY_TYPE.MODEL })
      expect($connection.getCollection).toHaveBeenCalled()
    })
  })

  describe('put()', () => {
    it('should throw an error if data missing', async () => {
      expect(() => $connection.invoke(HTTP_METHOD.PUT, 'users', { type: QUERY_TYPE.MODEL })).toThrow()
    })

    it('should return item data', async () => {
      Connection.connector.$request = jest.fn().mockReturnValue({ data: 'data user 1' })
      const response = await $connection.invoke(HTTP_METHOD.PUT, 'users', { type: QUERY_TYPE.MODEL, id: 1, data: {} })
      expect(response).toStrictEqual({ data: 'data user 1' })
    })

    it('should call put and return item data', async () => {
      $connection.put = jest.fn().mockReturnValue({})
      await $connection.invoke(HTTP_METHOD.PUT, 'users', { type: QUERY_TYPE.MODEL, id: 1, data: {} })
      expect($connection.put).toHaveBeenCalled()
    })
  })

  describe('deleteItem()', () => {
    it('should delete item', async () => {
      Connection.connector.$request = jest.fn().mockReturnValue({})
      const response = await $connection.invoke(HTTP_METHOD.DELETE, 'users', { type: QUERY_TYPE.MODEL, id: 1 })
      expect(response).toStrictEqual({})
    })

    it('should call deleteItem', async () => {
      $connection.deleteItem = jest.fn().mockReturnValue({})
      await $connection.invoke(HTTP_METHOD.DELETE, 'users', { type: QUERY_TYPE.MODEL, id: 1 })
      expect($connection.deleteItem).toHaveBeenCalled()
    })
  })
})