Configurable URL for the API (#205)

* Configurable engine URL

Fixes #206

* fix import.meta problem (#210)

---------

Co-authored-by: Kurt Hutten <k.hutten@protonmail.ch>

src/setupTests.ts

@@ -1,6 +1,17 @@
 import '@testing-library/jest-dom'
 import util from 'util'
 import fetch from 'isomorphic-fetch'
+import fs from 'fs'
+
+jest.mock('./env', () => {
+  // and set all the env vars from .env.development
+  const mockVars: { [key: string]: string } = {}
+  fs.readFileSync('.env.development', 'utf8')
+    .split('\n')
+    .map((line) => line.split('='))
+    .forEach(([key, value]) => (mockVars[key] = value))
+  return mockVars
+})
 
 class MockRTCPeerConnection {
   constructor() {}