Override Jetpack development mode to activate modules for testing in WordPress

functions.php

/**
 * Modify Jetpack module properties for testing/development
 *
 * @param array $mod Module to look at modifying the properties of.
 * @return boolean
 */
function jp_module_override( $mod ) {
	switch ( $mod['name'] ) {
		case 'Related posts':
			$mod['requires_connection'] = false;
			break;
	}
	return $mod;
}
add_filter( 'jetpack_get_module', 'jp_module_override' );