Ticket #44428: test-object-cache-bug.php

<?php

namespace FeedsByTag\test;

class TermObjectCache extends \WP_UnitTestCase {

        public function testObjectTermCache() {
                $post_factory = new \WP_UnitTest_Factory_For_Post( $this );
                $term_factory = new \WP_UnitTest_Factory_For_Term( $this );

                register_post_type( 'sandwich', array( 'public' => true ) );
                register_taxonomy( 'condiment', array( 'sandwich' ), array( 'label' => 'Condiments' ) );

                $sauerkraut = $term_factory->create([
                        'taxonomy' => 'condiment',
                        'name' => 'Sauerkraut'
                ]);

                $reuben = $post_factory->create([
                        'post_title' => 'Reuben',
                        'post_type' => 'sandwich',
                ]);

                wp_set_object_terms( $reuben, array( $sauerkraut ), 'condiment' );

                add_filter( 'get_term', array( $this, 'noTermsForGuests' ), 10, 2 );

                $sandwiches = get_posts( [ 'post_type' => 'sandwich', 'update_post_term_cache' => false ] );
                $this->assertCount( 1, $sandwiches ); // This is fine

                $sandwiches = get_posts( [ 'post_type' => 'sandwich', 'update_post_term_cache' => true ] );
                $this->assertCount( 1, $sandwiches ); // This throws an

                remove_filter( 'get_term', array( $this, 'noTermsForGuests' ) );


        }

        public function noTermsForGuests( $term, $taxonomy ) {
                if ( ! is_user_logged_in() ) {
                        $term = null;
                }
                return $term;
        }

}