Fix IDs.

tests/phpunit/tests/rest-api/rest-schema-setup.php

@@ -762,17 +762,17 @@
 		$datetime_keys = array( 'date', 'date_gmt', 'modified', 'modified_gmt' );
 
 		global $wpdb;
 		$posts = $wpdb->get_results("SELECT id, post_title, post_name as slug FROM $wpdb->posts");
 
 		//Save all titles
 		$post_data = array();
 		foreach( $posts as $post ) {
 			$post_data[] = $post->id;
 			$post_data[] = $post->post_title;
 			$post_data[] = $post->slug;
 		}
 
 		$post_data = implode(',', $post_data);
 		foreach ( $data as $key => $value ) {
 			if ( is_string( $value ) ) {
 				if ( in_array( $key, $datetime_keys, true ) ) {
@@ -781,8 +781,7 @@
 				}
 
 				if ( 1 === preg_match( '/^post-\d+$/', $value ) ) {
-					// Normalize the class value to ensure test stability.
-					$data[ $key ] = $post_data;
+					$data[ $key ] = $value . '-' . $post_data;
 					continue;
 				}
 			}