Ticket #46133: 46133.diff

tests/phpunit/tests/formatting/ExcerptRemoveBlocks.php

@@ +1 @@
+<?php
+
+/**
+ * @group formatting
+ * @covers ::excerpt_remove_blocks
+ */
+class Tests_Formatting_ExcerptRemoveBlocks extends WP_UnitTestCase {
+
+        public static $post_id;
+
+        public $content = '
+<!-- wp:paragraph -->
+<p>paragraph</p>
+<!-- /wp:paragraph -->
+<!-- wp:latest-posts {"postsToShow":3,"displayPostDate":true,"order":"asc","orderBy":"title"} /-->
+<!-- wp:spacer -->
+<div style="height:100px" aria-hidden="true" class="wp-block-spacer"></div>
+<!-- /wp:spacer -->';
+
+        public $filtered_content = '
+
+<p>paragraph</p>
+
+
+';
+
+        /**
+         * Fake block rendering function.
+         *
+         * @since 5.2.0
+         *
+         * @return string Block output.
+         */
+        function render_fake_block() {
+                return get_the_excerpt( self::$post_id );
+        }
+
+        /**
+         * Set up.
+         * 
+         * @since 5.2.0
+         */
+        function setUp() {
+                parent::setUp();
+                self::$post_id = $this->factory()->post->create(
+                        array(
+                                'post_excerpt' => '', // Empty excerpt, so it has to be generated.
+                                'post_content' => '<!-- wp:core/fake /-->',
+                        )
+                );
+                register_block_type(
+                        'core/fake',
+                        array(
+                                'render_callback' => array( $this, 'render_fake_block' ),
+                        )
+                );
+        }
+
+        /**
+         * Tear down.
+         *
+         * @since 5.2.0
+         */
+        function tearDown() {
+                parent::tearDown();
+                $registry = WP_Block_Type_Registry::get_instance();
+                $registry->unregister( 'core/fake' );
+                wp_delete_post( self::$post_id, true );
+        }
+
+        /**
+         * Tests excerpt_remove_blocks().
+         *
+         * @ticket 46133
+         */
+        function test_excerpt_remove_blocks() {
+                // Simple dynamic block..
+                $content = '<!-- wp:core/block /-->';
+
+                $this->assertEmpty( excerpt_remove_blocks( $content ) );
+
+                // Dynamic block with options, embedded in other content.
+                $this->assertEquals( $this->filtered_content, excerpt_remove_blocks( $this->content ) );
+        }
+
+        /**
+         * Tests that dynamic blocks don't cause an out-of-memory error.
+         *
+         * When dynamic blocks happen to generate an excerpt, they can cause an
+         * infinite loop if that block is part of the post's content.
+         *
+         * `wp_trim_excerpt()` applies the `the_content` filter, which has
+         * `do_blocks` attached to it, trying to render the block which again will
+         * attempt to return an excerpt of that post.
+         *
+         * This infinite loop can be avoided by stripping dynamic blocks before
+         * `the_content` gets applied, just like shortcodes.
+         *
+         * @ticket 46133
+         */
+        function test_excerpt_infinite_loop() {
+                $query = new WP_Query(
+                        array(
+                                'post__in' => array( self::$post_id ),
+                        )
+                );
+                $query->the_post();
+                $this->assertEmpty( do_blocks( '<!-- wp:core/fake /-->' ) );
+        }
+}