feat(testing): add serviceWorker tests

test/patches/service-worker-mock-fetch.patch

@@ -0,0 +1,15 @@
+--- node_modules/service-worker-mock/fetch.js	2021-02-18 13:47:55.000000000 -0700
++++ patches/service-worker-mock-fixed.js	2021-02-18 15:49:47.000000000 -0700
+@@ -1,8 +1,11 @@
+ module.exports = async (request) => {
++  const Response = require('./models/Response');
+   const response = new Response('Response from service-worker-mock/fetch.js', {
+     status: 200,
+     statusText: 'ok.'
+   });
+-  response.url = request.url;
++  if (request && request.url) {
++    response.url = request.url;
++  }
+   return response;
+ };

test/patches/service-worker-mock-response.patch

@@ -0,0 +1,9 @@
+--- node_modules/service-worker-mock/models/Response.js	2021-02-18 13:47:55.000000000 -0700
++++ patches/service-worker-mock-response.js	2021-02-18 15:57:12.000000000 -0700
+@@ -1,5 +1,6 @@
+ // stubs https://developer.mozilla.org/en-US/docs/Web/API/Response
+ const Body = require('./Body');
++const Blob = require('./Blob');
+ const Headers = require('./Headers');
+
+ const isSupportedBodyType = (body) =>

test/patches/service-worker-types.patch

@@ -0,0 +1,14 @@
+--- node_modules/@types/service-worker-mock/index.d.ts	2021-02-18 13:51:50.000000000 -0700
++++ patches/service-workertypes.d.ts	2021-02-18 16:30:01.000000000 -0700
+@@ -3,6 +3,11 @@
+ // Definitions by: Remco Haszing <https://github.com/remcohaszing>
+ // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+ // TypeScript Version: 2.8
++// https://gist.github.com/shqld/32df51a4a4ed429f2c76e4e2cfdf6f96#gistcomment-2793376
++// excludes default libs such as 'dom' conflicting with 'webworker'
++/// <reference no-default-lib="true"/>
++/// <reference lib="esnext" />
++/// <reference lib="webworker" />
+ 
+ export = makeServiceWorkerEnv;
+ declare function makeServiceWorkerEnv(): WorkerGlobalScope;