Test if imported method is called-CodePudding

I'm trying to test if a composable's method is called from my store. Here's what I have:

/stores/ui:

import { defineStore } from 'pinia';
import { useUtils } from '@/composables/utils';

const { sendEvent } = useUtils();

interface State {
  tab: string,
}
export const useUIStore = defineStore('ui', {
  state: (): State => ({
    tab: 'Home',
  }),
  actions: {
    setTab(tabName: string) {
      this.tab = tabName;
      sendEvent('navigation', `click_${tabName}`);
    },
  }
})

@/composables/utils:

export function useUtils() {
  const sendEvent = (name: string, value: string) => {
    // do stuff
  };

  return {
    sendEvent
  };
}

And here's my test file:

import { setActivePinia, createPinia } from 'pinia'
import { useUIStore } from '@/stores/ui';
import { useUtils } from '@/composables/utils';

describe('', () => {
  let uiStore;

  beforeEach(() => {
    setActivePinia(createPinia());
    uiStore = useUIStore();
  })

  it('Sets the active tab', () => {
    let sendEvent = jest.spyOn(useUtils(), 'sendEvent');
    expect(uiStore.tab).toBe('Home');
    uiStore.setTab('help');
    expect(uiStore.tab).toBe('help');
    expect(sendEvent).toHaveBeenCalledTimes(1);
  });
})

I've also tried mocking the import:

jest.mock(
  '@/composables/utils',
  () => {
    function useUtils() {
      return {
        sendEvent: jest.fn(),
      }
    }
      
    return {
      useUtils
    };
  },
  { virtual: true },
);
import { useUtils } from '@/composables/utils';

expect(jest.fn()).toHaveBeenCalledTimes(expected)
Expected number of calls: 1
Received number of calls: 0

What's the correct way of adding a spy to sendEvent ?

CodePudding user response：

In your test file - mock the utils:

const mockSendEvent = jest.fn();
jest.mock("@/composables/utils", () => ({
  useUtils: () => ({
    sendEvent: mockSendEvent,
  }),
}));

and then update your test to use the mock:

it('Sets the active tab', () => {
  expect(uiStore.tab).toBe('Home');
  uiStore.setTab('help');
  expect(uiStore.tab).toBe('help');
  expect(mockSendEvent).toHaveBeenCalledTimes(1);
});