fix: fix issue & tests

app/routes/app.ts

@@ -21,7 +21,9 @@ export default class AppRoute extends Route {
   }
 
   async model({ locale }: { locale: string }) {
-    this.intl.locale = locale === 'en-us' ? locale : [locale, 'en-us'];
+    if (this.intl.locale[0] !== locale) {
+      this.intl.locale = locale === 'en-us' ? locale : [locale, 'en-us'];
+    }
     // No await here, let's the loading happen & await for it in generator route
     this.harfbuzz.loadWASM();
     this.fontManager.loadFont();

app/routes/index.ts

@@ -1,11 +1,13 @@
 import Route from '@ember/routing/route';
 import { inject as service } from '@ember/service';
+import RouterService from '@ember/routing/router-service';
 import IntlService from 'ember-intl/services/intl';
 
 export default class IndexRoute extends Route {
   @service declare intl: IntlService;
+  @service declare router: RouterService;
 
   async model() {
-    this.transitionTo('app.index', this.intl.locale[0]);
+    this.router.transitionTo('app.index', this.intl.locale[0]);
   }
 }

tests/integration/components/lang-switcher-test.ts

@@ -10,11 +10,13 @@ const {
   APP: { availableLanguages },
 } = config;
 import waitCalciteReady from 'text2stl/tests/helpers/wait-calcite-ready';
+import { setupIntl } from 'ember-intl/test-support';
 
 import type IntlService from 'ember-intl/services/intl';
 
 module('Integration | Component | lang-switcher', function (hooks) {
   setupRenderingTest(hooks);
+  setupIntl(hooks);
 
   hooks.afterEach(function () {
     (this.owner.lookup('service:intl') as IntlService).locale = 'en-us';

tests/integration/components/settings-form-test.ts

@@ -5,9 +5,11 @@ import { render } from '@ember/test-helpers';
 import { hbs } from 'ember-cli-htmlbars';
 import { setComponentTemplate } from '@ember/component';
 import { ModelType } from 'text2stl/services/text-maker';
+import { setupIntl } from 'ember-intl/test-support';
 
 module('Integration | Component | settings-form', function (hooks) {
   setupRenderingTest(hooks);
+  setupIntl(hooks);
 
   test('it renders', async function (assert) {
     class SettingsFormFont extends Component {}

tests/integration/components/settings-form/font-test.ts

@@ -6,9 +6,11 @@ import { setComponentTemplate } from '@ember/component';
 import { tracked } from '@glimmer/tracking';
 import templateOnly from '@ember/component/template-only';
 import waitCalciteReady from 'text2stl/tests/helpers/wait-calcite-ready';
+import { setupIntl } from 'ember-intl/test-support';
 
 module('Integration | Component | settings-form/font', function (hooks) {
   setupRenderingTest(hooks);
+  setupIntl(hooks);
 
   test('it renders', async function (assert) {
     // mock the FontPicker

tests/integration/components/settings-form/handle-test.ts

@@ -10,9 +10,11 @@ import TextMakerSettings from 'text2stl/models/text-maker-settings';
 import { ModelType } from 'text2stl/services/text-maker';
 import fillCalciteInput from 'text2stl/tests/helpers/fill-calcite-input';
 import waitCalciteReady from 'text2stl/tests/helpers/wait-calcite-ready';
+import { setupIntl } from 'ember-intl/test-support';
 
 module('Integration | Component | advanced-settings-form/handle', function (hooks) {
   setupRenderingTest(hooks);
+  setupIntl(hooks);
 
   test('it renders', async function (assert) {
     const model = new TextMakerSettings({

tests/integration/components/settings-form/support-test.ts

@@ -9,9 +9,11 @@ const {
 import TextMakerSettings from 'text2stl/models/text-maker-settings';
 import { ModelType } from 'text2stl/services/text-maker';
 import fillCalciteInput from 'text2stl/tests/helpers/fill-calcite-input';
+import { setupIntl } from 'ember-intl/test-support';
 
 module('Integration | Component | advanced-settings-form/support', function (hooks) {
   setupRenderingTest(hooks);
+  setupIntl(hooks);
 
   test('it renders', async function (assert) {
     const model = new TextMakerSettings({

tests/integration/components/settings-form/text-test.ts

@@ -8,11 +8,12 @@ const {
 } = config;
 import TextMakerSettings from 'text2stl/models/text-maker-settings';
 import { ModelType } from 'text2stl/services/text-maker';
-
 import fillCalciteInput from 'text2stl/tests/helpers/fill-calcite-input';
+import { setupIntl } from 'ember-intl/test-support';
 
 module('Integration | Component | settings-form/text', function (hooks) {
   setupRenderingTest(hooks);
+  setupIntl(hooks);
 
   test('it renders', async function (assert) {
     const model = new TextMakerSettings({

tests/integration/components/settings-form/type-select-test.ts

@@ -9,9 +9,11 @@ const {
 import TextMakerSettings from 'text2stl/models/text-maker-settings';
 import { ModelType } from 'text2stl/services/text-maker';
 import wait from 'text2stl/tests/helpers/wait';
+import { setupIntl } from 'ember-intl/test-support';
 
 module('Integration | Component | settings-form/select-type', function (hooks) {
   setupRenderingTest(hooks);
+  setupIntl(hooks);
 
   test('it renders', async function (assert) {
     const model = new TextMakerSettings({

tests/integration/components/three-preview-test.ts

@@ -4,9 +4,11 @@ import { render } from '@ember/test-helpers';
 import { hbs } from 'ember-cli-htmlbars';
 import { setComponentTemplate } from '@ember/component';
 import Component from '@glimmer/component';
+import { setupIntl } from 'ember-intl/test-support';
 
 module('Integration | Component | three-preview', function (hooks) {
   setupRenderingTest(hooks);
+  setupIntl(hooks);
 
   test('it renders', async function (assert) {
     class ThreePreviewRenderer extends Component {}

tests/integration/components/three-preview/size-test.ts

@@ -3,9 +3,11 @@ import { setupRenderingTest } from 'ember-qunit';
 import { render } from '@ember/test-helpers';
 import { hbs } from 'ember-cli-htmlbars';
 import { Mesh, BoxGeometry } from 'three';
+import { setupIntl } from 'ember-intl/test-support';
 
 module('Integration | Component | tree-preview/size', function (hooks) {
   setupRenderingTest(hooks);
+  setupIntl(hooks);
 
   test('it renders nothing when no mesh is specified', async function (assert) {
     await render(hbs`<ThreePreview::Size data-test />`);