[Bugfix release] Ensure jQuery “monkey patch” are included via modules.

This both tidies up the code, but also ensures embroider compatibility
For those users with ember 2.27.x but still have jQuery

addon-test-support/@ember/test-helpers/settled.ts

@@ -2,6 +2,8 @@
 import { _backburner } from '@ember/runloop';
 import Ember from 'ember';
 
+import EmberApplicationInstance from '@ember/application/instance';
+
 import { nextTick } from './-utils';
 import waitUntil from './wait-until';
 import { hasPendingTransitions } from './setup-application-context';
@@ -30,6 +32,31 @@ const _internalPendingRequests = (() => {
   return () => 0;
 })();
 
+if (typeof jQuery !== 'undefined' && _internalPendingRequests) {
+  // This exists to ensure that the AJAX listeners setup by Ember itself
+  // (which as of 2.17 are not properly torn down) get cleared and released
+  // when the application is destroyed. Without this, any AJAX requests
+  // that happen _between_ acceptance tests will always share
+  // `pendingRequests`.
+  //
+  // This can be removed once Ember 4.0.0 is released
+  EmberApplicationInstance.reopen({
+    willDestroy(...args: any[]) {
+
+      const internalPendingRequests= _internalPendingRequests();
+
+      if (internalPendingRequests === 0) { return; }
+
+      jQuery(document).off('ajaxSend', internalPendingRequests.incrementPendingRequests);
+      jQuery(document).off('ajaxComplete', internalPendingRequests.decrementPendingRequests);
+
+      internalPendingRequests.clearPendingRequests();
+
+      this._super(...args);
+    },
+  });
+}
+
 let requests: XMLHttpRequest[];
 
 /**

index.js

@@ -6,12 +6,6 @@ const debugTree = BroccoliDebug.buildDebugCallback('ember-test-helpers');
 module.exports = {
   name: require('./package').name,
 
-  included() {
-    this._super.included.apply(this, arguments);
-
-    this.import('vendor/monkey-patches.js', { type: 'test' });
-  },
-
   treeForAddonTestSupport(tree) {
     // intentionally not calling _super here
     // so that can have our `import`'s be