Unit Tests? "Missing values for: hostName"

[ceri-waterscreative]

Hiya,

I wish to write Unit tests for a few of my functions which require the admin object.

I've tried using unathenticated requests for this, but alas I keep getting an error..
ShopifyError: Cannot initialize Shopify API Library. Missing values for: hostName

I can confirm I'm passing in my environment file too, and the required environment variables are there.

My code if that helps..

import prisma from '../db.server.js';
import { PrismaSessionStorage } from '@shopify/shopify-app-session-storage-prisma';
import { setUpValidSession } from '@shopify/shopify-api/test-helpers';
import { test as testOrderPaid } from './order-paid.server.js';
import {
  ApiVersion,
  AppDistribution,
  shopifyApp,
} from "@shopify/shopify-app-remix/server";
import { testShopifyStore } from './helpers.server.js';

const sessionStorage = new PrismaSessionStorage(prisma);
const session = setUpValidSession({
    shop: testShopifyStore,
});
await sessionStorage.storeSession(session);

const shopify = shopifyApp({
  apiKey: process.env.SHOPIFY_API_KEY,
  apiSecretKey: process.env.SHOPIFY_API_SECRET || "",
  apiVersion: ApiVersion.January25,
  scopes: process.env.SCOPES?.split(","),
  appUrl: process.env.SHOPIFY_APP_URL || "",
  hostName: process.env.SHOPIFY_APP_URL || "",
  authPathPrefix: "/auth",
  sessionStorage: sessionStorage,
  distribution: AppDistribution.AppStore,
  future: {
    unstable_newEmbeddedAuthStrategy: true,
    removeRest: true,
  },
  ...(process.env.SHOP_CUSTOM_DOMAIN
    ? { customShopDomains: [process.env.SHOP_CUSTOM_DOMAIN] }
    : {}),
});

const { unauthenticated } = shopify;

// Testing..

const { admin } = await unauthenticated(testShopifyStore);

const response = await testOrderPaid(admin, session);
if(response.result === false){
    throw new Error("Order Paid Test Failed: " + JSON.stringify(response.errors));
} else {
    console.log("Order Paid Test Passed");
}

Any ideas??