Add more tests for renamed items

Author: jyn514

src/test/rustdoc/redirect-rename.rs

@@ -4,6 +4,10 @@ mod hidden {
     // @has foo/hidden/struct.Foo.html
     // @has - '//p/a' '../../foo/struct.FooBar.html'
     pub struct Foo {}
+    pub union U { a: usize }
+    pub enum Empty {}
+    pub const C: usize = 1;
+    pub static S: usize = 1;
 
     // @has foo/hidden/bar/index.html
     // @has - '//p/a' '../../foo/baz/index.html'
@@ -16,6 +20,14 @@ mod hidden {
 
 // @has foo/struct.FooBar.html
 pub use hidden::Foo as FooBar;
+// @has foo/union.FooU.html
+pub use hidden::U as FooU;
+// @has foo/enum.FooEmpty.html
+pub use hidden::Empty as FooEmpty;
+// @has foo/constant.FooC.html
+pub use hidden::C as FooC;
+// @has foo/static.FooS.html
+pub use hidden::S as FooS;
 
 // @has foo/baz/index.html
 // @has foo/baz/struct.Thing.html