Add test for nonzero catchall schema versions

src/lib.rs

@@ -524,7 +524,7 @@ mod tests {
     }
 
     #[test]
-    fn catchall_schema() {
+    fn catchall_schema_v0() {
         #[derive(Debug, PartialEq, Eq, Deserialize, Serialize)]
         struct Catchall(HashMap<String, String>);
         impl SchemaV0 for Catchall {}
@@ -539,6 +539,64 @@ mod tests {
         )
     }
 
+    #[test]
+    fn catchall_schema_v1_v2() {
+        #[derive(Debug, PartialEq, Eq, Deserialize, Serialize)]
+        struct Catchall0(HashMap<String, String>);
+        impl SchemaV0 for Catchall0 {}
+
+        #[derive(Debug, PartialEq, Eq, Deserialize, Serialize)]
+        struct Catchall1 {
+            count: usize,
+            #[serde(flatten)]
+            data: HashMap<String, String>,
+        }
+        impl Schema for Catchall1 {
+            type Prev = Catchall0;
+        }
+        impl From<Catchall0> for Catchall1 {
+            fn from(old: Catchall0) -> Self {
+                Catchall1 {
+                    data: old.0,
+                    count: 0,
+                }
+            }
+        }
+
+        #[derive(Debug, PartialEq, Eq, Deserialize, Serialize)]
+        struct Catchall2 {
+            count: usize,
+            name: String,
+            #[serde(flatten)]
+            data: HashMap<String, String>,
+        }
+        impl Schema for Catchall2 {
+            type Prev = Catchall1;
+        }
+        impl From<Catchall1> for Catchall2 {
+            fn from(old: Catchall1) -> Self {
+                Catchall2 {
+                    data: old.data,
+                    count: old.count,
+                    name: String::new(),
+                }
+            }
+        }
+
+        let mut data = HashMap::new();
+        data.insert("hello".into(), "world".into());
+        data.insert("catch".into(), "all".into());
+
+        assert_eq!(
+            Catchall2::parse(r#"{"version":1,"count":42,"hello":"world","catch":"all"}"#).unwrap(),
+            Catchall2 {
+                data,
+                count: 42,
+                name: String::new(),
+            },
+        )
+    }
+
     #[test]
     fn unversioned() {
         #[derive(Debug, PartialEq, Eq, Deserialize, Serialize)]