add test case for sidebar link sorting

Author: chenyukang

tests/rustdoc/sidebar-link-sort.rs

@@ -0,0 +1,13 @@
+// issue #56018: "Implementations on Foreign Types" sidebar items should be sorted by name
+#![crate_name = "foo"]
+#![no_std]
+
+pub trait Foo {}
+
+//@ has 'foo/trait.Foo.html'
+//@ snapshot sidebar - '//*[@class="sidebar-elems"]'
+impl Foo for u32 {}
+impl Foo for u8 {}
+impl Foo for u16 {}
+
+impl<'a> Foo for &'a str {}

tests/rustdoc/sidebar-link-sort.sidebar.html

@@ -0,0 +1 @@
+<div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Foo</a></h2><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-Foo-for-%26str" title="&amp;'a str">&amp;'a str</a></li><li><a href="#impl-Foo-for-u8" title="u8">u8</a></li><li><a href="#impl-Foo-for-u16" title="u16">u16</a></li><li><a href="#impl-Foo-for-u32" title="u32">u32</a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate foo</a></h2></div></div>

tests/rustdoc/sidebar/sidebar-links-to-foreign-impl.rs

@@ -7,12 +7,10 @@
 //@ has - '//h2[@id="foreign-impls"]' 'Implementations on Foreign Types'
 //@ has - '//*[@class="sidebar-elems"]//section//a[@href="#impl-Foo-for-u32"]' 'u32'
 //@ has - '//*[@id="impl-Foo-for-u32"]//h3[@class="code-header"]' 'impl Foo for u32'
-//@ has - '//*[@id="impl-Foo-for-u8"]//h3[@class="code-header"]' 'impl Foo for u8'
 //@ has - "//*[@class=\"sidebar-elems\"]//section//a[@href=\"#impl-Foo-for-%26str\"]" "&'a str"
 //@ has - "//*[@id=\"impl-Foo-for-%26str\"]//h3[@class=\"code-header\"]" "impl<'a> Foo for &'a str"
 pub trait Foo {}
 
 impl Foo for u32 {}
-impl Foo for u8 {}
 
 impl<'a> Foo for &'a str {}