public function data_populate_network_meta() {
    return array(
      array(
        array(),
        array(
          // Random meta to check.
          'registration'      => 'none',
          'blog_upload_space' => '100',
          'fileupload_maxk'   => '1500',
        ),
      ),
      array(
        array(
          'site_name' => 'My Great Network',
          'WPLANG'    => 'fr_FR',
        ),
        array(
          // Random meta to check.
          'site_name'         => 'My Great Network',
          'registration'      => 'none',
          'blog_upload_space' => '100',
          'fileupload_maxk'   => '1500',
          'WPLANG'            => 'fr_FR',
        ),
      ),
      array(
        array(
          'custom_meta' => '1',
        ),
        array(
          // Random meta to check.
          'custom_meta'       => '1',
          'registration'      => 'none',
          'blog_upload_space' => '100',
          'fileupload_maxk'   => '1500',
        ),
      ),
    );
  }