fix: harden url mapping validation

tests/bootstrap.php

@@ -125,6 +125,19 @@ if ( ! function_exists( 'esc_url_raw' ) ) {
 	}
 }
 
+if ( ! function_exists( 'wp_parse_url' ) ) {
+	/**
+	 * Minimal URL parser for unit tests.
+	 *
+	 * @param string $url URL to parse.
+	 * @return array<string, mixed>|false
+	 */
+	function wp_parse_url( $url ) {
+		// phpcs:ignore WordPress.WP.AlternativeFunctions.parse_url_parse_url -- Test stub for WordPress' wp_parse_url().
+		return parse_url( $url );
+	}
+}
+
 if ( ! function_exists( 'get_option' ) ) {
 	/**
 	 * Minimal WordPress option reader for unit tests.