tests/qapi-schema: Error case tests for features in structs

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20190606153803.5278-4-armbru@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
diff --git a/tests/qapi-schema/features-duplicate-name.json b/tests/qapi-schema/features-duplicate-name.json
new file mode 100644
index 0000000..29358e6
--- /dev/null
+++ b/tests/qapi-schema/features-duplicate-name.json
@@ -0,0 +1,3 @@
+{ 'struct': 'FeatureStruct0',
+  'data': { 'foo': 'int' },
+  'features': [ 'foo', 'bar', 'foo' ] }