rustdoc: Add test for tuple rendering

Author: ollie27

src/test/rustdoc/tuples.rs

@@ -0,0 +1,18 @@
+// Copyright 2016 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.
+
+#![crate_name = "foo"]
+
+// @has foo/fn.tuple0.html //pre 'pub fn tuple0(x: ())'
+pub fn tuple0(x: ()) -> () { x }
+// @has foo/fn.tuple1.html //pre 'pub fn tuple1(x: (i32,)) -> (i32,)'
+pub fn tuple1(x: (i32,)) -> (i32,) { x }
+// @has foo/fn.tuple2.html //pre 'pub fn tuple2(x: (i32, i32)) -> (i32, i32)'
+pub fn tuple2(x: (i32, i32)) -> (i32, i32) { x }