api.js

import * as user from './user-api'

export default {
  user
}

axios-custom.js

import axios from 'axios'

axios.defaults.baseURL = 'http://127.0.0.1:8000'

export const setToken = (token) => { axios.defaults.headers.common['Authorization'] = token }
export const deleteToken = () => { delete axios.defaults.headers.common['Authorization'] }

export default axios

user-actions.js

import * as axios from './../../../api/axios-custom'
import * as types from './../../mutation-types'
import api from './../../../api/api'

export const asyncLogin = ({ commit, getters }, { email, password }) => {
  return api.user.login({
    email: email,
    password: password
  })
    .then(response => {
      commit(types.LOGIN, response.data)
      axios.setToken(getters.getToken)

      return response
    })
}

user-actions.spec.js

import { expect } from 'chai'
import { describe, it } from 'mocha'

import { state as initState } from './index'
import * as types from './../../mutation-types'
const actionsInjector = require('inject!./user-actions')

const actions = actionsInjector({
  './../../../api/api': {
    'user.login': () => new Promise((resolve) => {
      resolve({
        data: {
          token: '9944b09199c62bcf9418ad846dd0e4bbdfc6ee4b',
          username: 'ololo'
        }
      })
    })
  }
})

const testAction = (action, payload, state, expectedMutations, done) => {
  let count = 0

  const commit = (type, payload) => {
    const mutation = expectedMutations[count]
    expect(mutation.type).to.equal(type)
    if (payload) {
      expect(mutation.payload).to.eql(payload)
    }

    ++count
    if (count >= expectedMutations.length) {
      done()
    }
  }

  action({ commit, state }, payload)

  if (expectedMutations.length === 0) {
    expect(count).to.equal(0)
    done()
  }
}

describe('user', () => {
  describe('actions', () => {
    it('login', done => {
      const payload = {
        email: 'email',
        password: 'password'
      }

      const response = {
        token: '9944b09199c62bcf9418ad846dd0e4bbdfc6ee4b',
        username: 'ololo'
      }

      testAction(actions.asyncLogin, payload, initState, [
        { type: types.LOGIN, payload: response }
      ], done)
    })
  })
})

user-api.js

import axios from './axios-custom'

export const login = (data) => axios.post('/account/login/', data)