CHORE: Modernize integration/ tests and remove run loop calls

packages/-ember-data/tests/integration/adapter/find-all-test.js

@@ -153,6 +153,7 @@ module('integration/adapter/find-all - Finding All Records of a Type', function(
     );
 
     store.createRecord('person', { name: 'Carsten Nielsen' });
+    await settled();
 
     await settled();
 

packages/-ember-data/tests/integration/application-test.js

@@ -2,7 +2,6 @@ import Namespace from '@ember/application/namespace';
 import Service, { inject as service } from '@ember/service';
 import Controller from '@ember/controller';
 import Application from '@ember/application';
-import { run } from '@ember/runloop';
 import Store from 'ember-data/store';
 import { module, test } from 'qunit';
 import { setupTest } from 'ember-qunit';
@@ -110,12 +109,6 @@ module('integration/application - Attaching initializer', function(hooks) {
     this.owner = null;
   });
 
-  hooks.afterEach(function() {
-    if (this.application !== null) {
-      run(this.application, 'destroy');
-    }
-  });
-
   test('ember-data initializer is run', async function(assert) {
     let ran = false;
 
@@ -129,7 +122,7 @@ module('integration/application - Attaching initializer', function(hooks) {
 
     this.application = this.TestApplication.create({ autoboot: false });
 
-    await run(() => this.application.boot());
+    await this.application.boot();
 
     assert.ok(ran, 'ember-data initializer was found');
   });
@@ -149,7 +142,8 @@ module('integration/application - Attaching initializer', function(hooks) {
 
     this.application = this.TestApplication.create({ autoboot: false });
 
-    await run(() => this.application.boot().then(() => (this.owner = this.application.buildInstance())));
+    await this.application.boot();
+    this.owner = this.application.buildInstance();
 
     let store = this.owner.lookup('service:store');
     assert.ok(

packages/-ember-data/tests/integration/debug-adapter-test.js

@@ -1,9 +1,9 @@
 import { setupTest } from 'ember-qunit';
 import { A } from '@ember/array';
 import { get } from '@ember/object';
-import { run } from '@ember/runloop';
 import Model from '@ember-data/model';
 import Adapter from '@ember-data/adapter';
+import { DebugAdapter } from 'ember-data/-private';
 import { module, test } from 'qunit';
 import { settled } from '@ember/test-helpers';
 import { attr } from '@ember-data/model';
@@ -16,24 +16,25 @@ class Post extends Model {
 module('integration/debug-adapter - DS.DebugAdapter', function(hooks) {
   setupTest(hooks);
 
-  let store, debugAdapter;
+  let store;
 
   hooks.beforeEach(function() {
     let { owner } = this;
 
     owner.register('model:post', Post);
     store = owner.lookup('service:store');
-    debugAdapter = owner.lookup('data-adapter:main');
-
-    debugAdapter.reopen({
+    let _adapter = DebugAdapter.extend({
       getModelTypes() {
         return A([{ klass: Post, name: 'post' }]);
       },
     });
+    owner.register('data-adapter:main', _adapter);
   });
 
   test('Watching Model Types', async function(assert) {
     assert.expect(5);
+    let { owner } = this;
+    let debugAdapter = owner.lookup('data-adapter:main');
 
     function added(types) {
       assert.equal(types.length, 1, 'added one type');
@@ -60,6 +61,8 @@ module('integration/debug-adapter - DS.DebugAdapter', function(hooks) {
   });
 
   test('Watching Records', async function(assert) {
+    let { owner } = this;
+    let debugAdapter = owner.lookup('data-adapter:main');
     let addedRecords, updatedRecords, removedIndex, removedCount;
 
     this.owner.register(
@@ -156,7 +159,7 @@ module('integration/debug-adapter - DS.DebugAdapter', function(hooks) {
     addedRecords = updatedRecords = [];
     removedCount = removedIndex = null;
 
-    run(() => post.unloadRecord());
+    post.unloadRecord();
 
     await settled();
 
@@ -165,6 +168,8 @@ module('integration/debug-adapter - DS.DebugAdapter', function(hooks) {
   });
 
   test('Column names', function(assert) {
+    let { owner } = this;
+    let debugAdapter = owner.lookup('data-adapter:main');
     class Person extends Model {
       @attr()
       title;