diff --git a/app/assets/javascripts/discourse/tests/helpers/component-test.js b/app/assets/javascripts/discourse/tests/helpers/component-test.js
index b3ea05ff343..b3be51d2ecf 100644
--- a/app/assets/javascripts/discourse/tests/helpers/component-test.js
+++ b/app/assets/javascripts/discourse/tests/helpers/component-test.js
@@ -1,48 +1,12 @@
-/* global andThen */
-
-import { TestModuleForComponent, render } from "@ember/test-helpers";
-import MessageBus from "message-bus-client";
-import EmberObject from "@ember/object";
-import { setupRenderingTest as EmberSetupRenderingTest } from "ember-qunit";
+import { render } from "@ember/test-helpers";
 import Session from "discourse/models/session";
 import Site from "discourse/models/site";
 import TopicTrackingState from "discourse/models/topic-tracking-state";
 import User from "discourse/models/user";
 import { autoLoadModules } from "discourse/initializers/auto-load-modules";
-import createStore from "discourse/tests/helpers/create-store";
-import { currentSettings } from "discourse/tests/helpers/site-settings";
 import QUnit, { test } from "qunit";
-import KeyValueStore from "discourse/lib/key-value-store";
 
-const LEGACY_ENV = !EmberSetupRenderingTest;
-
-export function setupRenderingTest(hooks) {
-  if (!LEGACY_ENV) {
-    return EmberSetupRenderingTest.apply(this, arguments);
-  }
-
-  let testModule;
-
-  hooks.before(function () {
-    const name = this.moduleName.split("|").pop();
-    testModule = new TestModuleForComponent(name, {
-      integration: true,
-    });
-  });
-
-  hooks.beforeEach(function () {
-    testModule.setContext(this);
-    return testModule.setup(...arguments);
-  });
-
-  hooks.afterEach(function () {
-    return testModule.teardown(...arguments);
-  });
-
-  hooks.after(function () {
-    testModule = null;
-  });
-}
+export { setupRenderingTest } from "ember-qunit";
 
 export default function (name, opts) {
   opts = opts || {};
@@ -51,7 +15,7 @@ export default function (name, opts) {
     return;
   }
 
-  if (typeof opts.template === "string" && !LEGACY_ENV) {
+  if (typeof opts.template === "string") {
     let testName = QUnit.config.currentModule.name + " " + name;
     // eslint-disable-next-line
     console.warn(
@@ -63,61 +27,10 @@ export default function (name, opts) {
   test(name, async function (assert) {
     this.site = Site.current();
     this.session = Session.current();
+    this.container = this.owner;
+    const store = this.owner.lookup("service:store");
 
-    let owner = LEGACY_ENV ? this.registry : this.owner;
-    let store;
-
-    if (LEGACY_ENV) {
-      this.registry.register("site-settings:main", currentSettings(), {
-        instantiate: false,
-      });
-      this.registry.register("capabilities:main", EmberObject);
-      this.registry.register("message-bus:main", MessageBus, {
-        instantiate: false,
-      });
-      this.registry.register("site:main", this.site, { instantiate: false });
-      this.registry.register("session:main", this.session, {
-        instantiate: false,
-      });
-      const keyValueStore = new KeyValueStore("discourse_");
-      this.registry.register("key-value-store:main", keyValueStore, {
-        instantiate: false,
-      });
-
-      this.registry.injection(
-        "component",
-        "siteSettings",
-        "site-settings:main"
-      );
-      this.registry.injection("component", "appEvents", "service:app-events");
-      this.registry.injection("component", "capabilities", "capabilities:main");
-      this.registry.injection("component", "site", "site:main");
-      this.registry.injection("component", "session", "session:main");
-      this.registry.injection("component", "messageBus", "message-bus:main");
-      this.registry.injection(
-        "component",
-        "keyValueStore",
-        "key-value-store:main"
-      );
-
-      this.registry.injection("service", "session", "session:main");
-      this.registry.injection("service", "messageBus", "message-bus:main");
-      this.registry.injection("service", "siteSettings", "site-settings:main");
-      this.registry.injection(
-        "service",
-        "keyValueStore",
-        "key-value-store:main"
-      );
-
-      this.siteSettings = currentSettings();
-      store = createStore();
-      this.registry.register("service:store", store, { instantiate: false });
-    } else {
-      this.container = owner;
-      store = this.container.lookup("service:store");
-    }
-
-    autoLoadModules(this.container, this.registry);
+    autoLoadModules(this.owner, this.registry);
 
     if (!opts.anonymous) {
       const currentUser = User.create({
@@ -126,58 +39,41 @@ export default function (name, opts) {
       });
       this.currentUser = currentUser;
 
-      owner.unregister("current-user:main");
-      owner.register("current-user:main", currentUser, {
+      this.owner.unregister("current-user:main");
+      this.owner.register("current-user:main", currentUser, {
         instantiate: false,
       });
 
-      if (LEGACY_ENV) {
-        owner.injection("component", "currentUser", "current-user:main");
-        owner.injection("service", "currentUser", "current-user:main");
-      } else {
-        owner.inject("component", "currentUser", "current-user:main");
-        owner.inject("service", "currentUser", "current-user:main");
-      }
+      this.owner.inject("component", "currentUser", "current-user:main");
+      this.owner.inject("service", "currentUser", "current-user:main");
 
-      owner.unregister("topic-tracking-state:main");
-      owner.register(
+      this.owner.unregister("topic-tracking-state:main");
+      this.owner.register(
         "topic-tracking-state:main",
         TopicTrackingState.create({ currentUser }),
         { instantiate: false }
       );
 
-      if (LEGACY_ENV) {
-        owner.injection(
-          "service",
-          "topicTrackingState",
-          "topic-tracking-state:main"
-        );
-      } else {
-        owner.inject(
-          "service",
-          "topicTrackingState",
-          "topic-tracking-state:main"
-        );
-      }
+      this.owner.inject(
+        "service",
+        "topicTrackingState",
+        "topic-tracking-state:main"
+      );
     }
 
     if (opts.beforeEach) {
-      opts.beforeEach.call(this, store);
+      await opts.beforeEach.call(this, store);
     }
 
     $.fn.autocomplete = function () {};
-    andThen(() => {
-      return LEGACY_ENV ? this.render(opts.template) : render(opts.template);
-    });
 
-    andThen(() => {
-      return opts.test.call(this, assert);
-    }).finally(async () => {
+    try {
+      await render(opts.template);
+      await opts.test.call(this, assert);
+    } finally {
       if (opts.afterEach) {
-        await andThen(() => {
-          return opts.afterEach.call(opts);
-        });
+        await opts.afterEach.call(opts);
       }
-    });
+    }
   });
 }
diff --git a/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js b/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js
index 908a01511a5..bde6d6577db 100644
--- a/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js
+++ b/app/assets/javascripts/discourse/tests/helpers/qunit-helpers.js
@@ -70,8 +70,6 @@ import {
   clearTextDecorateCallbacks,
 } from "discourse/lib/to-markdown";
 
-const LEGACY_ENV = !setupApplicationTest;
-
 export function currentUser() {
   return User.create(sessionFixtures["/session/current.json"].current_user);
 }
@@ -188,9 +186,7 @@ function testCleanup(container, app) {
   resetLastEditNotificationClick();
   clearAuthMethods();
   setTestPresence(true);
-  if (!LEGACY_ENV) {
-    clearPresenceCallbacks();
-  }
+  clearPresenceCallbacks();
   restoreBaseUri();
   resetTopicsSectionLinks();
   clearTagDecorateCallbacks();
@@ -217,9 +213,7 @@ export function discourseModule(name, options) {
 
       this.getController = function (controllerName, properties) {
         let controller = this.container.lookup(`controller:${controllerName}`);
-        if (!LEGACY_ENV) {
-          controller.application = {};
-        }
+        controller.application = {};
         controller.siteSettings = this.siteSettings;
         if (properties) {
           controller.setProperties(properties);
@@ -304,16 +298,7 @@ export function acceptance(name, optionsOrCallback) {
 
       resetSite(currentSettings(), siteChanges);
 
-      if (LEGACY_ENV) {
-        getApplication().__registeredObjects__ = false;
-        getApplication().reset();
-      }
       this.container = getOwner(this);
-      if (LEGACY_ENV && loggedIn) {
-        updateCurrentUser({
-          appEvents: this.container.lookup("service:app-events"),
-        });
-      }
 
       if (!this.owner) {
         this.owner = this.container;
@@ -330,11 +315,6 @@ export function acceptance(name, optionsOrCallback) {
       options?.afterEach?.call(this);
       testCleanup(this.container, app);
 
-      if (LEGACY_ENV) {
-        app.__registeredObjects__ = false;
-        app.reset();
-      }
-
       // We do this after reset so that the willClearRender will have already fired
       resetWidgetCleanCallbacks();
     },
@@ -380,18 +360,16 @@ export function acceptance(name, optionsOrCallback) {
       hooks.afterEach(setup.afterEach);
       callback(needs);
 
-      if (!LEGACY_ENV && getContext) {
-        setupApplicationTest(hooks);
+      setupApplicationTest(hooks);
 
-        hooks.beforeEach(function () {
-          // This hack seems necessary to allow `DiscourseURL` to use the testing router
-          let ctx = getContext();
-          this.container.registry.unregister("router:main");
-          this.container.registry.register("router:main", ctx.owner.router, {
-            instantiate: false,
-          });
+      hooks.beforeEach(function () {
+        // This hack seems necessary to allow `DiscourseURL` to use the testing router
+        let ctx = getContext();
+        this.container.registry.unregister("router:main");
+        this.container.registry.register("router:main", ctx.owner.router, {
+          instantiate: false,
         });
-      }
+      });
     });
   } else {
     // Old way
@@ -523,25 +501,7 @@ export async function selectText(selector, endOffset = null) {
     selection.addRange(range);
   };
 
-  if (LEGACY_ENV) {
-    // In the Ember CLI environment, the settled() helper seems to take care of waiting
-    // for this event to fire. In legacy, we need to do it manually.
-    let callback;
-    const selectEventFiredPromise = new Promise((resolve) => {
-      callback = resolve;
-      document.addEventListener("selectionchange", callback);
-    });
-
-    performSelection();
-
-    try {
-      await selectEventFiredPromise;
-    } finally {
-      document.removeEventListener("selectionchange", callback);
-    }
-  } else {
-    performSelection();
-  }
+  performSelection();
 
   await settled();
 }
diff --git a/app/assets/javascripts/discourse/tests/integration/components/d-editor-test.js b/app/assets/javascripts/discourse/tests/integration/components/d-editor-test.js
index 02a5af80fcd..0f62df37c39 100644
--- a/app/assets/javascripts/discourse/tests/integration/components/d-editor-test.js
+++ b/app/assets/javascripts/discourse/tests/integration/components/d-editor-test.js
@@ -98,9 +98,9 @@ discourseModule("Integration | Component | d-editor", function (hooks) {
       beforeEach() {
         this.set("value", "hello world.");
       },
-      test(assert) {
+      async test(assert) {
         const textarea = jumpEnd(query("textarea.d-editor-input"));
-        testFunc.call(this, assert, textarea);
+        await testFunc.call(this, assert, textarea);
       },
       skip: !navigator.userAgent.includes("Chrome"),
     });
@@ -113,9 +113,9 @@ discourseModule("Integration | Component | d-editor", function (hooks) {
         this.set("value", "hello world.");
       },
 
-      test(assert) {
+      async test(assert) {
         const textarea = jumpEnd(query("textarea.d-editor-input"));
-        testFunc.call(this, assert, textarea);
+        await testFunc.call(this, assert, textarea);
       },
     });
   }
diff --git a/app/assets/javascripts/discourse/tests/setup-tests.js b/app/assets/javascripts/discourse/tests/setup-tests.js
index d441da9f1f6..6d7d0943f41 100644
--- a/app/assets/javascripts/discourse/tests/setup-tests.js
+++ b/app/assets/javascripts/discourse/tests/setup-tests.js
@@ -10,10 +10,7 @@ import pretender, {
   pretenderHelpers,
   resetPretender,
 } from "discourse/tests/helpers/create-pretender";
-import {
-  currentSettings,
-  resetSettings,
-} from "discourse/tests/helpers/site-settings";
+import { resetSettings } from "discourse/tests/helpers/site-settings";
 import { setDefaultOwner } from "discourse-common/lib/get-owner";
 import { setApplication, setResolver } from "@ember/test-helpers";
 import { setupS3CDN, setupURL } from "discourse-common/lib/get-url";
@@ -394,20 +391,6 @@ function setupTestsCommon(application, container, config) {
   resetSite();
 }
 
-export function setupTestsLegacy(application) {
-  app = application;
-  setResolver(buildResolver("discourse").create({ namespace: app }));
-  setupTestsCommon(application, app.__container__);
-
-  app.instanceInitializer({
-    name: "test-helper",
-    initialize: testsInitialized,
-    teardown: testsTornDown,
-  });
-  app.SiteSettings = currentSettings();
-  app.start();
-}
-
 export default function setupTests(config) {
   let settings = resetSettings();
   app = createApplication(config, settings);
diff --git a/app/assets/javascripts/discourse/tests/test_starter.js b/app/assets/javascripts/discourse/tests/test_starter.js
deleted file mode 100644
index 067e890fc16..00000000000
--- a/app/assets/javascripts/discourse/tests/test_starter.js
+++ /dev/null
@@ -1,115 +0,0 @@
-// discourse-skip-module
-
-document.body.insertAdjacentHTML(
-  "afterbegin",
-  `
-    <div id="ember-testing-container"><div id="ember-testing"></div></div>
-    <style>#ember-testing-container { position: fixed; background: white; bottom: 0; right: 0; width: 640px; height: 384px; overflow: auto; z-index: 9999; border: 1px solid #ccc; transform: translateZ(0)} #ember-testing { width: 200%; height: 200%; transform: scale(0.5); transform-origin: top left; }</style>
-  `
-);
-
-let setupTestsLegacy = require("discourse/tests/setup-tests").setupTestsLegacy;
-setupTestsLegacy(window.Discourse);
-
-const keyFromKeyCode = {
-  8: "Backspace",
-  9: "Tab",
-  13: "Enter",
-  16: "Shift",
-  17: "Control",
-  18: "Alt",
-  20: "CapsLock",
-  27: "Escape",
-  32: " ",
-  37: "ArrowLeft",
-  38: "ArrowUp",
-  39: "ArrowRight",
-  40: "ArrowDown",
-  48: "0",
-  49: "1",
-  50: "2",
-  51: "3",
-  52: "4",
-  53: "5",
-  54: "6",
-  55: "7",
-  56: "8",
-  57: "9",
-  65: "a",
-  66: "b",
-  67: "c",
-  68: "d",
-  69: "e",
-  70: "f",
-  71: "g",
-  72: "h",
-  73: "i",
-  74: "j",
-  75: "k",
-  76: "l",
-  77: "m",
-  78: "n",
-  79: "o",
-  80: "p",
-  81: "q",
-  82: "r",
-  83: "s",
-  84: "t",
-  85: "u",
-  86: "v",
-  87: "w",
-  88: "x",
-  89: "y",
-  90: "z",
-  91: "Meta",
-  93: "Meta",
-  97: "a",
-  98: "b",
-  99: "c",
-  100: "d",
-  101: "e",
-  102: "f",
-  103: "g",
-  104: "h",
-  105: "i",
-  106: "j",
-  107: "k",
-  108: "l",
-  109: "m",
-  110: "n",
-  111: "o",
-  112: "p",
-  113: "q",
-  114: "r",
-  115: "s",
-  116: "t",
-  117: "u",
-  118: "v",
-  119: "w",
-  120: "x",
-  121: "y",
-  122: "z",
-  187: "=",
-  189: "-",
-};
-
-window.keyEvent = function (selector, contextOrType, typeOrKeyCode, keyCode) {
-  let context, type;
-
-  if (keyCode === undefined) {
-    context = null;
-    keyCode = typeOrKeyCode;
-    type = contextOrType;
-  } else {
-    context = contextOrType;
-    type = typeOrKeyCode;
-  }
-
-  let key = keyFromKeyCode[keyCode];
-
-  return window.triggerEvent(selector, context, type, {
-    keyCode,
-    which: keyCode,
-    key,
-  });
-};
diff --git a/package.json b/package.json
index 5b061217a45..d0618c1763d 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,6 @@
   "author": "Discourse",
   "license": "GPL-2.0-only",
   "dependencies": {
-    "@fortawesome/fontawesome-free": "5.15.4",
     "@discourse/moment-timezone-names-translations": "^1.0.0",
     "@fortawesome/fontawesome-free": "5.15.4",
     "@highlightjs/cdn-assets": "^10.7.0",