From d79722b09fb31f89fe473f4bfa0c5c08795182ed Mon Sep 17 00:00:00 2001
From: Peter Wilson <peterwilsoncc@git.wordpress.org>
Date: Thu, 18 Feb 2021 01:11:18 +0000
Subject: [PATCH] Editor: Additional tests for reusable blocks.

Ensure that subsequent renders of a reusable block will render correctly and that recursively inserting a reusable block into itself does not cause an internal server (500) error.

Props bernhard-reiter, SergeyBiryukov.
Fixes #52364.



git-svn-id: https://develop.svn.wordpress.org/trunk@50382 602fd350-edb4-49c9-b593-d223f7449a82
---
 .../phpunit/tests/blocks/render-reusable.php  | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/tests/phpunit/tests/blocks/render-reusable.php b/tests/phpunit/tests/blocks/render-reusable.php
index 66b01b0428..eeea33b343 100644
--- a/tests/phpunit/tests/blocks/render-reusable.php
+++ b/tests/phpunit/tests/blocks/render-reusable.php
@@ -88,6 +88,38 @@ class WP_Test_Render_Reusable_Blocks extends WP_UnitTestCase {
 		$this->assertSame( '<p>Hello world!</p>', $output );
 	}
 
+	/**
+	 * Make sure that a reusable block can be rendered twice in a row.
+	 *
+	 * @ticket 52364
+	 */
+	public function test_render_subsequent() {
+		$block_type = WP_Block_Type_Registry::get_instance()->get_registered( 'core/block' );
+		$output     = $block_type->render( array( 'ref' => self::$block_id ) );
+		$output    .= $block_type->render( array( 'ref' => self::$block_id ) );
+		$this->assertSame( '<p>Hello world!</p><p>Hello world!</p>', $output );
+	}
+
+	/**
+	 * Throw a warning if blocks are recursively nested.
+	 *
+	 * @ticket 52364
+	 */
+	public function test_recursive_render_warning() {
+		$recursive_reusable_block = array(
+			'ID'           => self::$block_id,
+			'post_content' => '<!-- wp:block {"ref":' . self::$block_id . '} /-->',
+		);
+		wp_update_post( $recursive_reusable_block );
+
+		$block_type = WP_Block_Type_Registry::get_instance()->get_registered( 'core/block' );
+
+		// The block_render method for `core/block` triggers a user warning if it
+		// encounters a recursively nested block.
+		$this->expectException( 'PHPUnit_Framework_Error_Warning' );
+		$block_type->render( array( 'ref' => self::$block_id ) );
+	}
+
 	public function test_ref_empty() {
 		$block_type = WP_Block_Type_Registry::get_instance()->get_registered( 'core/block' );
 		$output     = $block_type->render( array() );