Rollup merge of #45746 - GuillaumeGomez:methods-doc-test, r=steveklabnik

Add tests for methods listing in rust docs

r? @rust-lang/docs

Author: kennytm

src/test/rustdoc/method-list.rs

@@ -0,0 +1,30 @@
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// ignore-tidy-linelength
+
+#![crate_name = "foo"]
+
+// @has foo/struct.Foo.html
+// @has - '//*[@class="sidebar-links"]/a' 'super_long_name'
+// @has - '//*[@class="sidebar-links"]/a' 'Disp'
+pub struct Foo(usize);
+
+impl Foo {
+    pub fn super_long_name() {}
+}
+
+pub trait Disp {
+    fn disp_trait_method();
+}
+
+impl Disp for Foo {
+    fn disp_trait_method() {}
+}