Add test for index-page

Author: GuillaumeGomez

src/test/rustdoc/index-page.rs

@@ -0,0 +1,18 @@
+// Copyright 2018 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.
+
+// compile-flags: -Z unstable-options --enable-index-page
+
+#![crate_name = "foo"]
+
+// @has foo/../index.html
+// @has - '//span[@class="in-band"]' 'List of all crates'
+// @has - '//ul[@class="mod"]//a[@href="foo/index.html"]' 'foo'
+pub struct Foo;