test: map gatsby-page-utils correctly for test cases

  * @see gatsbyjs/gatsby#34803
  * @see jestjs/jest#9771

Author: literat

config/jest/config.js

@@ -20,6 +20,7 @@ module.exports = {
     '.+\\.(css|styl|less|sass|scss)$': 'identity-obj-proxy',
     '.+\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$':
       '<rootDir>/tests/__mocks__/file-mock.js',
+    '^gatsby-page-utils/(.*)$': `gatsby-page-utils/dist/$1`, // Workaround for https://github.com/facebook/jest/issues/9771
   },
 
   // An array of regexp pattern strings that are matched against all test paths before executing the test