remove code method

packages/app/test/integration/service/pagev5.test.ts

@@ -31,13 +31,6 @@ describe('PageService page operations with only public pages', () => {
     });
   };
 
-  // pass unless the data is one of [false, 0, '', null, undefined, NaN]
-  const expectAllToBeTruthy = (dataList) => {
-    dataList.forEach((data) => {
-      expect(data).toBeTruthy();
-    });
-  };
-
   beforeAll(async() => {
     crowi = await getInstance();
     await crowi.configManager.updateConfigsInTheSameNamespace('crowi', { 'app:isV5Compatible': true });