Test against ember 6.12 LTS, and fix the release/beta/canary scenarios

.github/workflows/ci.yml

@@ -80,6 +80,7 @@ jobs:
           - { name: "ember-lts-5.12", directory: "tests/vite-app" }
           - { name: "ember-lts-6.4", directory: "tests/vite-app" }
           - { name: "ember-lts-6.8", directory: "tests/vite-app" }
+          - { name: "ember-lts-6.12", directory: "tests/vite-app" }
           - { name: "ember-release", directory: "tests/vite-app" }
           - { name: "ember-beta", directory: "tests/vite-app" }
           - { name: "ember-canary", directory: "tests/vite-app" }

tests/vite-app/.env.development

@@ -0,0 +1,3 @@
+# `vite build --mode development` still sets NODE_ENV=production.
+# Tests need the development build of ember-source 7+, which has assertions.
+NODE_ENV=development

tests/vite-app/.gitignore

@@ -9,6 +9,7 @@
 
 # misc
 /.env*
+!/.env.development
 /.pnp*
 /.eslintcache
 /coverage/

tests/vite-app/babel.config.cjs

@@ -15,7 +15,6 @@ module.exports = {
     [
       'babel-plugin-ember-template-compilation',
       {
-        compilerPath: 'ember-source/dist/ember-template-compiler.js',
         enableLegacyModules: [
           'ember-cli-htmlbars',
           'ember-cli-htmlbars-inline-precompile',

tests/vite-app/config/ember-try.js

@@ -5,6 +5,8 @@ const getChannelURL = require('ember-source-channel-url');
 module.exports = async function () {
   return {
     usePnpm: true,
+    // Build and test the same way as the `test:ember` script.
+    command: 'pnpm test:ember',
     buildManagerOptions() {
       return ['--ignore-scripts', '--no-frozen-lockfile'];
     },
@@ -73,6 +75,14 @@ module.exports = async function () {
           },
         },
       },
+      {
+        name: 'ember-lts-6.12',
+        npm: {
+          devDependencies: {
+            'ember-source': '~6.12.0',
+          },
+        },
+      },
       {
         name: 'ember-release',
         npm: {

tests/vite-app/package.json

@@ -36,11 +36,11 @@
     "@babel/plugin-transform-typescript": "^7.28.0",
     "@ember/optional-features": "^2.0.0",
     "@ember/string": "^4.0.0",
-    "@ember/test-helpers": "^5.4.1",
-    "@embroider/compat": "^4.0.3",
+    "@ember/test-helpers": "^5.5.1",
+    "@embroider/compat": "^4.1.25",
     "@embroider/config-meta-loader": "^1.0.0",
-    "@embroider/core": "^4.0.3",
-    "@embroider/vite": "^1.1.1",
+    "@embroider/core": "^4.6.7",
+    "@embroider/vite": "^1.7.13",
     "@glimmer/component": "^2.0.0",
     "@glimmer/tracking": "^1.1.2",
     "@glint/ember-tsc": "^1.0.8",
@@ -50,17 +50,16 @@
     "@tsconfig/ember": "^3.0.1",
     "@types/qunit": "^2.19.13",
     "@types/rsvp": "^4.0.6",
-    "babel-plugin-ember-template-compilation": "^3.0.1",
+    "babel-plugin-ember-template-compilation": "^4.0.0",
     "concurrently": "^9.2.1",
     "decorator-transforms": "^2.3.0",
     "ember-auto-import": "^2.12.0",
-    "ember-cli": "~6.9.1",
+    "ember-cli": "~7.3.0",
     "ember-cli-babel": "^8.2.0",
-    "ember-cli-htmlbars": "^7.0.0",
     "ember-load-initializers": "^3.0.0",
     "ember-modifier": "^4.2.2",
     "ember-page-title": "^9.0.3",
-    "ember-qunit": "^9.0.0",
+    "ember-qunit": "^9.1.0",
     "ember-resolver": "^13.0.0",
     "ember-source": "~6.9.0",
     "ember-source-channel-url": "^3.0.0",
@@ -73,7 +72,7 @@
     "qunit": "^2.20.0",
     "qunit-dom": "^3.0.0",
     "reactiveweb": "workspace:*",
-    "tracked-built-ins": "^4.0.0",
+    "tracked-built-ins": "^4.1.2",
     "typescript": "^5.6.3",
     "vite": "^7.3.0"
   },
@@ -85,7 +84,7 @@
   },
   "dependencies": {
     "@ember/test-waiters": "^4.1.1",
-    "@embroider/macros": "^1.19.5",
+    "@embroider/macros": "^1.21.1",
     "@nullvoxpopuli/eslint-configs": "^5.5.0",
     "ember-concurrency": "^5.0.0",
     "ember-modify-based-class-resource": "^1.1.0",