Environment plugin to enhance testing for prisma

[aiji42]

I have created an environment plugin to improve the experience of testing with a combination of vitest and prisma.
vitest-environment-vprisma

It allows you to isolate each test case with a transaction and rollback after completion, giving you a safe and clean testing environment.

// example.test.ts
test("Add user", async () => {
  const createdUser = await prisma.user.create({
    data: {
      nickname: "user1",
      email: "[email protected]",
    },
  });

  expect(
    await prisma.user.findFirst({
      where: {
        id: createdUser.id,
      },
    })
  ).toStrictEqual(createdUser);
  expect(await prisma.user.count()).toBe(1);
});

// Each test case is isolated in a transaction and also rolled back, so it is not affected by another test result.
test("Count user", async () => {
  expect(await prisma.user.count()).toBe(0);
});

It can also be used with environment libraries officially supported by vitest, such as jsdom, happy-dom, and edge-runtime. So even if you are using Remix or Next.js and need to run both client-side and back-end tests, it is no problem.

// vitest.config.ts
import { defineConfig } from "vite";

export default defineConfig({
  test: {
    globals: true,
    environment: "vprisma",
    setupFiles: ["vitest-environment-vprisma/setup"],
    environmentOptions: {
      vprisma: {
        baseEnv: "jsdom",
      }
    },
  },
});

Please try it and let me know if you have any requests for improvement.