Because @ember/test-helpers uses a macroCondition looking at ember-source, and declares a peerDependency, we must use depMeta*injected

Author: NullVoxPopuli

.github/workflows/ci-build.yml

@@ -40,7 +40,9 @@ jobs:
       - name: Build addon
         working-directory: addon
         run: pnpm build
+      - run: pnpm i -f # sync injected dependencies
       - run: pnpm test
+        working-directory: test-app
       - name: own types 
         working-directory: addon
         run: pnpm tsc --noEmit 
@@ -61,7 +63,9 @@ jobs:
       - name: Build addon
         working-directory: addon
         run: pnpm build
+      - run: pnpm i -f # sync injected dependencies
       - name: Run Tests
+        working-directory: test-app
         run: pnpm test
       - name: own types 
         working-directory: addon
@@ -103,6 +107,7 @@ jobs:
       - name: Build addon
         working-directory: addon
         run: pnpm build
+      - run: pnpm i -f # sync injected dependencies
       - name: test
         working-directory: test-app
         run: node_modules/.bin/ember try:one ${{ matrix.ember-try-scenario }} --skip-cleanup

pnpm-lock.yaml

@@ -22,14 +22,18 @@
     "test": "ember test",
     "test:ember": "ember test"
   },
+  "dependenciesMeta": {
+    "@ember/test-helpers": {
+      "injected": true
+    }
+  },
   "devDependencies": {
     "@babel/eslint-parser": "^7.21.3",
     "@babel/plugin-proposal-decorators": "^7.21.0",
     "@ember/jquery": "^2.0.0",
     "@ember/optional-features": "^2.0.0",
     "@ember/string": "^3.0.1",
     "@ember/test-helpers": "workspace:*",
-    "pretender": "^3.4.7",
     "@embroider/test-setup": "^4.0.0",
     "@glimmer/component": "^1.1.2",
     "@glimmer/tracking": "^1.1.2",
@@ -60,6 +64,7 @@
     "eslint-plugin-qunit": "^7.3.4",
     "latest-version": "^5.0.0",
     "loader.js": "^4.7.0",
+    "pretender": "^3.4.7",
     "prettier": "^2.8.7",
     "qunit": "^2.21.1",
     "qunit-dom": "^3.2.0",