Rustdoc-Json: Add tests for linking to foreign variants.

src/test/rustdoc-json/enums/auxiliary/color.rs

@@ -0,0 +1,5 @@
+pub enum Color {
+    Red,
+    Green,
+    Blue,
+}

src/test/rustdoc-json/enums/doc_link_to_foreign_variant.rs

@@ -0,0 +1,11 @@
+// aux-build: color.rs
+
+//! The purpose of this test it to have a link to [a foreign variant](Red).
+
+extern crate color;
+use color::Color::Red;
+
+// @set red = "$.index[*][?(@.inner.is_crate == true)].links.Red"
+
+// @!has "$.index[*][?(@.name == 'Red')]"
+// @!has "$.index[*][?(@.name == 'Color')]"

src/test/rustdoc-json/enums/use_variant_foreign.rs

@@ -0,0 +1,9 @@
+// aux-build: color.rs
+
+extern crate color;
+
+// @is "$.index[*][?(@.inner.name == 'Red')].kind" '"import"'
+pub use color::Color::Red;
+
+// @!has "$.index[*][?(@.name == 'Red')]"
+// @!has "$.index[*][?(@.name == 'Color')]"