medusa-store/integration-tests/environment-helpers/bootstrap-app.js

const path = require("path")
const express = require("express")
const getPort = require("get-port")
const { isObject } = require("@medusajs/utils")

module.exports = {
  bootstrapApp: async ({ cwd, env = {} } = {}) => {
    const app = express()

    if (isObject(env)) {
      Object.entries(env).forEach(([k, v]) => (process.env[k] = v))
    }

    const loaders = require("@medusajs/medusa/dist/loaders").default

    const { container, dbConnection } = await loaders({
      directory: path.resolve(cwd || process.cwd()),
      expressApp: app,
      isTest: false,
    })

    const PORT = await getPort()

    return {
      container,
      db: dbConnection,
      app,
      port: PORT,
    }
  },
}