Fix defaults test

Author: NullVoxPopuli

addon/src/services/page-title.js

@@ -56,6 +56,9 @@ export default class PageTitleService extends Service {
     let defaultPrepend = this._defaultConfig.prepend;
     let defaultReplace = this._defaultConfig.replace;
 
+    token.previous ??= null;
+    token.next ??= null;
+
     if (token.separator == null) {
       token.separator = defaultSeparator;
     }
@@ -100,7 +103,7 @@ export default class PageTitleService extends Service {
 
     let previous = this.tokens.slice(-1)[0];
     if (previous) {
-      token.previous = previous;
+      token.previous = previous ?? null;
       previous.next = token;
       this.inheritFromPrevious(token);
     }

pnpm-lock.yaml

@@ -54,7 +54,7 @@
     "ember-disable-prototype-extensions": "^1.1.3",
     "ember-load-initializers": "^2.1.2",
     "ember-maybe-import-regenerator": "^1.0.0",
-    "ember-page-title": "8.1.0",
+    "ember-page-title": "workspace:*",
     "ember-qunit": "^8.0.2",
     "ember-resolver": "^11.0.1",
     "ember-source": "~3.28.3",