rustdoc-json: Add test for supertraits

Author: aDotInTheVoid

Diff for: src/test/rustdoc-json/traits/supertrait.rs

@@ -0,0 +1,26 @@
+// ignore-tidy-linelength
+
+#![feature(no_core)]
+#![feature(lang_items)]
+#![no_core]
+
+// @set loud_id = supertrait.json "$.index[*][?(@.name=='Loud')].id"
+pub trait Loud {}
+
+// @set very_loud_id = - "$.index[*][?(@.name=='VeryLoud')].id"
+// @count - "$.index[*][?(@.name=='VeryLoud')].inner.bounds[*]" 1
+// @is -    "$.index[*][?(@.name=='VeryLoud')].inner.bounds[0].trait_bound.trait.inner.id" $loud_id
+pub trait VeryLoud: Loud {}
+
+// @set sounds_good_id = - "$.index[*][?(@.name=='SoundsGood')].id"
+pub trait SoundsGood {}
+
+// @count - "$.index[*][?(@.name=='MetalBand')].inner.bounds[*]" 2
+// @is -    "$.index[*][?(@.name=='MetalBand')].inner.bounds[0].trait_bound.trait.inner.id" $very_loud_id
+// @is -    "$.index[*][?(@.name=='MetalBand')].inner.bounds[1].trait_bound.trait.inner.id" $sounds_good_id
+pub trait MetalBand: VeryLoud + SoundsGood {}
+
+// @count - "$.index[*][?(@.name=='DnabLatem')].inner.bounds[*]" 2
+// @is -    "$.index[*][?(@.name=='DnabLatem')].inner.bounds[1].trait_bound.trait.inner.id" $very_loud_id
+// @is -    "$.index[*][?(@.name=='DnabLatem')].inner.bounds[0].trait_bound.trait.inner.id" $sounds_good_id
+pub trait DnabLatem: SoundsGood + VeryLoud {}