Merge pull request #190 from sval-rs/chore/json-unit-struct-test

Add a test case for unit structs

json/test/lib.rs

@@ -52,6 +52,9 @@ struct EmptyMap {}
 #[derive(Value, Serialize)]
 struct Tagged<T>(T);
 
+#[derive(Value, Serialize)]
+struct UnitStruct;
+
 #[derive(Clone, Value, Serialize)]
 enum Enum<F0, F1> {
     Constant,
@@ -154,6 +157,13 @@ fn stream_unit() {
     assert_json(());
 }
 
+#[test]
+fn stream_unit_struct() {
+    // NOTE: This is an incompatibility with `serde_json`
+    // In `serde_json` this would produce `null`
+    assert_stream("\"UnitStruct\"", UnitStruct);
+}
+
 #[test]
 fn stream_map_struct() {
     assert_json(MapStruct {