Add test case for feed_links_extra() when global post is empty

Author: westonruter

tests/phpunit/tests/general/feedLinksExtra.php

@@ -634,4 +634,15 @@ public function data_feed_links_extra_should_output_nothing_when_filters_return_
 			),
 		);
 	}
+
+	/**
+	 * @ticket 63263
+	 */
+	public function test_feed_links_extra_should_not_fail_if_global_post_empty() {
+		$post_id = self::factory()->post->create();
+		$this->go_to( get_permalink( $post_id ) );
+		$GLOBALS['post'] = null;
+
+		$this->assertEmpty( get_echo( 'feed_links_extra' ) );
+	}
 }