Share unit struct Unit between all tests

test_suite/tests/test_enum_internally_tagged.rs

@@ -12,6 +12,9 @@ use serde_derive::{Deserialize, Serialize};
 use serde_test::{assert_de_tokens, assert_de_tokens_error, assert_tokens, Token};
 use std::collections::BTreeMap;
 
+#[derive(Debug, PartialEq, Serialize, Deserialize)]
+struct Unit;
+
 #[derive(Debug, PartialEq, Serialize, Deserialize)]
 struct Newtype(BTreeMap<String, String>);
 
@@ -635,9 +638,6 @@ fn newtype_variant_containing_externally_tagged_enum() {
 
 #[test]
 fn newtype_variant_containing_unit_struct() {
-    #[derive(Debug, PartialEq, Serialize, Deserialize)]
-    struct Unit;
-
     #[derive(Debug, PartialEq, Serialize, Deserialize)]
     #[serde(tag = "tag")]
     enum Message {