mu-plugin to test nearby events

test-nearby-events.php

<?php

// type "error" into the city name field to simulate an HTTP request error
function nearbywp_trigger_error( $request, $request_args, $request_url ) {
	$url_params = explode( '&', parse_url( $request_url, PHP_URL_QUERY ) );

	if ( in_array( 'location=error', $url_params ) ) {
		$request = new WP_Error( 'test', 'testing error condition' );
	}

	return $request;
}
add_filter( 'pre_http_request', 'nearbywp_trigger_error', 10, 3 );