add TODO as a reminder in book list array test

test/unit/mocha/part2/book-list-will-contain-an-array-of-books.spec.js

@@ -25,7 +25,9 @@ describe('BookList.vue', () => {
 
  // Test for correct import statement
  const ast = esprima.parse(script[0].childNodes[0].value, { sourceType: 'module' });
- const results = esquery(ast, 'ExportDefaultDeclaration Property[key.name="books"] Property[value.value="American Gods"]')
+
+ // TODO: add extra assert to check if the array is in data() first, then after that assert passes let these tests run to check the properties.
+ const results = esquery(ast, 'ExportDefaultDeclaration Property[key.name=data] Property[key.name="books"] Property[value.value="American Gods"]')
  assert(results.length > 0, 'The book with a title of American Gods is not in your books array');
  });
 });