A basic unit test example for nuxt3 composable + prisma with vitest

prisma.spec.js

import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import { setup } from '@nuxt/test-utils-edge';

import { PrismaClient } from '@prisma/client';
// import { useAddJob } from '../composables/getdata.js';

/* this is useAddJob from getdata.js */
const prisma = new PrismaClient();

/* a simple function to be tested */
export async function useAddJob(jobData){
    const job = await prisma.job.create({
        data: jobData
    })

    return { job }
}

/* a basic list of jobs based on my prisma Job Schema */
const mockJobs = [
    {
        id: 56878,
        company: "Netloop",
        summary: "Some job summary",
        title: "job title",
        location: "San francisco",
        url: "https://ominia.com/be-my-employee",
        salaryMax: 30000,
        salaryMin: 20000,
        timePosted: 134548974
    },
    {
        id: 45590,
        company: "Google",
        summary: "an awesome job ",
        title: "Somer Over",
        location: "Ohio",
        url: "https://omperseron.com/job-my-bruh",
        salaryMax: 50000,
        salaryMin: 30000,
        timePosted: 1237438445
    }
]

/* mock `@prisma/client` module based on https://vitest.dev/guide/mocking.html#modules */

vi.mock('@prisma/client', () => {

    const Job = vi.fn();

    Job.prototype.create = vi.fn();
    Job.prototype.findMany = vi.fn();
    Job.prototype.findFirst = vi.fn();

    function PrismaClient(){
        this.job = new Job()
    }

    return { PrismaClient }
})

describe('Make sure database operations are working', async () => {
    let prisma;

    await setup({
        server: true
    })
  
    beforeEach(() => {
      prisma = new PrismaClient();
    })

    afterEach( () => {
      vi.clearAllMocks();
    })


    it("tests that useAddJob runs correctly", async ()=> {
          prisma.job.create.mockResolvedValueOnce(mockJobs[0])

          const { job } = await useAddJob(mockJobs[0]);

          expect(prisma.job.create).toBeCalledWith({ data: mockJobs[0] })
          expect(job.id == mockJobs[0].id).toBeTruthy();
    } )
  })