Add trait implementors sidebar tests

Author: aDotInTheVoid

src/test/rustdoc/sidebar-links-impls.rs

@@ -0,0 +1,49 @@
+// issue #56018: "Implementations on Foreign Types" sidebar items should link to specific impls
+
+#![crate_name = "foo"]
+
+// @has foo/trait.Foo.html
+// @has - '//*[@class="sidebar-title"]/a[@href="#foreign-impls"]' 'Implementations on Foreign Types'
+// @has - '//h2[@id="foreign-impls"]' 'Implementations on Foreign Types'
+// @has - '//*[@class="sidebar-links"]/a[@href="#impl-Foo-for-u32"]' 'u32'
+// @has - '//div[@id="impl-Foo-for-u32"]//h3[@class="code-header in-band"]' 'impl Foo for u32'
+// @has - '//*[@class="sidebar-links"]/a[@href="#impl-Foo-for-%26%27a%20str"]' "&'a str"
+// @has - '//div[@id="impl-Foo-for-%26%27a%20str"]//h3[@class="code-header in-band"]' "impl<'a> Foo for &'a str"
+pub trait Foo {}
+
+impl Foo for u32 {}
+
+impl<'a> Foo for &'a str {}
+
+// Issue #91118" "Implementors column on trait page is always empty"
+
+pub struct B;
+pub struct A;
+struct C;
+
+// @has foo/trait.Bar.html
+// @has - '//*[@class="sidebar-title"]/a[@href="#implementors"]' 'Implementors'
+// @has - '//h2[@id="implementors"]' 'Implementors'
+// @!has - '//*[@class="sidebar-title"]/a[@href="#foreign-impls"]'
+// @!has - '//h2[@id="foreign-impls"]'
+
+// @has - '//*[@class="sidebar-links"]/a[@href="#impl-Bar"]' '&A'
+// @has - '//*[@class="sidebar-links"]/a[@href="#impl-Bar-1"]' 'A'
+// @has - '//*[@class="sidebar-links"]/a[@href="#impl-Bar-2"]' 'B'
+
+// @has - '//div[@id="impl-Bar"]//h3[@class="code-header in-band"]' 'impl Bar for &A'
+// @has - '//div[@id="impl-Bar-1"]//h3[@class="code-header in-band"]' 'impl Bar for A'
+// @has - '//div[@id="impl-Bar-2"]//h3[@class="code-header in-band"]' 'impl Bar for B'
+pub trait Bar {}
+impl Bar for B {}
+impl Bar for A {}
+impl Bar for &A {}
+impl Bar for C {}
+
+// @has foo/trait.NotImpled.html
+// @!has - '//*[@class="sidebar-title"]/a[@href="#implementors"]'
+// FIXME: Is this the semantics we want
+// @has - '//h2[@id="implementors"]' 'Implementors'
+// @!has - '//*[@class="sidebar-title"]/a[@href="#foreign-impls"]'
+// @!has - '//h2[@id="foreign-impls"]'
+pub trait NotImpled {}