Fix exports, add test

Author: NullVoxPopuli

addon/package.json

@@ -23,6 +23,10 @@
       "types": "./declarations/services/page-title.d.ts",
       "default": "./dist/services/page-title.js"
     },
+    "./helpers/page-title": {
+      "types": "./declarations/helpers/page-title.d.ts",
+      "default": "./dist/helpers/page-title.js"
+    },
     "./test-support": {
       "types": "./declarations/test-support/index.d.ts",
       "default": "./dist/test-support/index.js"

test-types/index.ts

@@ -3,10 +3,12 @@ import '@glint/environment-ember-loose';
 
 // imports all resolve
 import 'ember-page-title';
-import 'ember-page-title/services/page-title';
 import 'ember-page-title/test-support';
 import 'ember-page-title/template-registry';
 import 'ember-page-title/service-registry';
+// required for ember-cli
+import 'ember-page-title/services/page-title';
+import 'ember-page-title/helpers/page-title';
 
 
 import { expectTypeOf } from 'expect-type';