DEV: Keep global state reset in a single place (#18049)

app/assets/javascripts/discourse/tests/acceptance/plugin-outlet-multi-template-test.js

@@ -3,7 +3,6 @@ import {
   count,
   query,
 } from "discourse/tests/helpers/qunit-helpers";
-import { clearCache } from "discourse/lib/plugin-connectors";
 import { hbs } from "ember-cli-htmlbars";
 import { test } from "qunit";
 import { visit } from "@ember/test-helpers";
@@ -14,7 +13,6 @@ const GOODBYE =
 
 acceptance("Plugin Outlet - Multi Template", function (needs) {
   needs.hooks.beforeEach(() => {
-    clearCache();
     // eslint-disable-next-line no-undef
     Ember.TEMPLATES[HELLO] = hbs`<span class='hello-span'>Hello</span>`;
     // eslint-disable-next-line no-undef
@@ -26,7 +24,6 @@ acceptance("Plugin Outlet - Multi Template", function (needs) {
     delete Ember.TEMPLATES[HELLO];
     // eslint-disable-next-line no-undef
     delete Ember.TEMPLATES[GOODBYE];
-    clearCache();
   });
 
   test("Renders a template into the outlet", async function (assert) {

app/assets/javascripts/discourse/tests/acceptance/sidebar-plugin-api-test.js

@@ -1,6 +1,5 @@
 import { test } from "qunit";
 import I18n from "I18n";
-
 import { click, visit } from "@ember/test-helpers";
 import {
   acceptance,
@@ -9,7 +8,6 @@ import {
   queryAll,
 } from "discourse/tests/helpers/qunit-helpers";
 import { withPluginApi } from "discourse/lib/plugin-api";
-import { resetSidebarSection } from "discourse/lib/sidebar/user/custom-sections";
 import { bind } from "discourse-common/utils/decorators";
 
 acceptance("Sidebar - Plugin API", function (needs) {
@@ -21,7 +19,6 @@ acceptance("Sidebar - Plugin API", function (needs) {
   });
 
   needs.hooks.afterEach(() => {
-    resetSidebarSection();
     linkDestroy = undefined;
     sectionDestroy = undefined;
   });

app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js

@@ -74,6 +74,7 @@ import { clearExtraHeaderIcons } from "discourse/widgets/header";
 import { resetSidebarSection } from "discourse/lib/sidebar/user/custom-sections";
 import { resetNotificationTypeRenderers } from "discourse/lib/notification-types-manager";
 import { resetUserMenuTabs } from "discourse/lib/user-menu/tab";
+import { reset as resetLinkLookup } from "discourse/lib/link-lookup";
 
 export function currentUser() {
   return User.create(sessionFixtures["/session/current.json"].current_user);
@@ -204,6 +205,7 @@ export function testCleanup(container, app) {
   resetNotificationTypeRenderers();
   clearExtraHeaderIcons();
   resetUserMenuTabs();
+  resetLinkLookup();
 }
 
 export function discourseModule(name, options) {

app/assets/javascripts/discourse/tests/unit/lib/link-lookup-test.js

@@ -1,9 +1,8 @@
-import LinkLookup, { reset } from "discourse/lib/link-lookup";
+import LinkLookup from "discourse/lib/link-lookup";
 import { module, test } from "qunit";
 import Post from "discourse/models/post";
 
 module("Unit | Utility | link-lookup", function (hooks) {
-  hooks.afterEach(() => reset());
   hooks.beforeEach(function () {
     this.post = Post.create();
     this.linkLookup = new LinkLookup({
@@ -21,6 +20,7 @@ module("Unit | Utility | link-lookup", function (hooks) {
       )[0]
     );
   });
+
   test("works with http", function (assert) {
     assert.ok(
       this.linkLookup.check(
@@ -29,6 +29,7 @@ module("Unit | Utility | link-lookup", function (hooks) {
       )[0]
     );
   });
+
   test("works with trailing slash", function (assert) {
     assert.ok(
       this.linkLookup.check(
@@ -37,6 +38,7 @@ module("Unit | Utility | link-lookup", function (hooks) {
       )[0]
     );
   });
+
   test("works with uppercase characters", function (assert) {
     assert.ok(
       this.linkLookup.check(