Ticket #21309: 21309-get_adjacent_post-ut.diff

tests/url.php

@@ -156 +156 @@
                 force_ssl_admin( $forced_admin );
                 force_ssl_login( $forced_login );
         }
+
+        function test_get_adjacent_post() {
+                $post_id = $this->factory->post->create();
+                sleep( 1 ); // get_adjacent_post() doesn't handle posts created in the same second.
+                $post_id2 = $this->factory->post->create();
+
+                $orig_post = $GLOBALS['post'];
+                $GLOBALS['post'] = get_post( $post_id2 );
+
+                $p = get_adjacent_post();
+                $this->assertInstanceOf( 'WP_Post', $p );
+                $this->assertEquals( $post_id, $p->ID );
+
+                // The same again to make sure a cached query returns the same result
+                $p = get_adjacent_post();
+                $this->assertInstanceOf( 'WP_Post', $p );
+                $this->assertEquals( $post_id, $p->ID );
+
+                // Test next
+                $p = get_adjacent_post( false, '', false );
+                $this->assertEquals( '', $p );
+
+                unset( $GLOBALS['post'] );
+                $this->assertNull( get_adjacent_post() );
+
+                $GLOBALS['post'] = $orig_post;
+
+                // Tests requiring creating more posts can't be run since the query
+                // cache in get_adjacent_post() requires a fresh page load to invalidate.
+        }
 }