Add rustdonc-json tests for enum variants

Author: GuillaumeGomez

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

@@ -0,0 +1,11 @@
+// @has variant_struct.json "$.index[*][?(@.name=='EnumStruct')].visibility" \"public\"
+// @has - "$.index[*][?(@.name=='EnumStruct')].kind" \"enum\"
+pub enum EnumStruct {
+    // @has - "$.index[*][?(@.name=='VariantS')].inner.variant_kind" \"struct\"
+    // @has - "$.index[*][?(@.name=='x')]"
+    // @has - "$.index[*][?(@.name=='y')]"
+    VariantS {
+        x: u32,
+        y: String,
+    },
+}

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

@@ -0,0 +1,6 @@
+// @has variant_tuple_struct.json "$.index[*][?(@.name=='EnumTupleStruct')].visibility" \"public\"
+// @has - "$.index[*][?(@.name=='EnumTupleStruct')].kind" \"enum\"
+pub enum EnumTupleStruct {
+    // @has - "$.index[*][?(@.name=='VariantA')].inner.variant_kind" \"tuple\"
+    VariantA(u32, String),
+}