Start fixing the json tests

serde2/src/json/value.rs

@@ -104,12 +104,6 @@ impl ser::Visitor for Serializer {
     type Value = ();
     type Error = ();
 
-    #[inline]
-    fn visit_unit(&mut self) -> Result<(), ()> {
-        self.state.push(State::Value(Value::Null));
-        Ok(())
-    }
-
     #[inline]
     fn visit_bool(&mut self, value: bool) -> Result<(), ()> {
         self.state.push(State::Value(Value::Bool(value)));
@@ -158,6 +152,22 @@ impl ser::Visitor for Serializer {
         value.visit(self)
     }
 
+    #[inline]
+    fn visit_unit(&mut self) -> Result<(), ()> {
+        self.state.push(State::Value(Value::Null));
+        Ok(())
+    }
+
+    #[inline]
+    fn visit_enum_unit(&mut self, _name: &str, variant: &str) -> Result<(), ()> {
+        let mut values = BTreeMap::new();
+        values.insert(variant.to_string(), Value::Array(vec![]));
+
+        self.state.push(State::Value(Value::Object(values)));
+
+        Ok(())
+    }
+
     #[inline]
     fn visit_seq<V>(&mut self, mut visitor: V) -> Result<(), ()>
         where V: ser::SeqVisitor,

serde2/tests/test_json.rs

@@ -346,7 +346,6 @@ fn test_write_tuple() {
     */
 }
 
-/*
 #[test]
 fn test_write_enum() {
     test_encode_ok(&[
@@ -408,6 +407,7 @@ fn test_write_enum() {
     */
 }
 
+/*
 #[test]
 fn test_write_option() {
     test_encode_ok(&[