fix: Retain property order when writing changes to package.json (#75)

* feat: Retain json order

* chore: Remove test_ prefix from JSON order test

Cargo.toml

@@ -18,7 +18,7 @@ color-eyre = "0.5.10"
 console = "0.13.0"
 dialoguer = "0.7.1"
 toml = "0.5.8"
-serde_json = "1.0.63"
+serde_json = { version = "1.0.63", features = ["preserve_order"] }
 git2 = "0.13.17"
 regex = "1.4.3"
 semver = "0.11.0"

src/package_json.rs

@@ -66,6 +66,27 @@ mod tests {
         let expected = r###"{
   "name": "tester",
   "version": "1.2.3-rc.4"
+}"###
+            .to_string();
+        assert_eq!(std::fs::read_to_string(file).unwrap(), expected);
+    }
+
+    #[test]
+    fn retain_property_order() {
+        let file = NamedTempFile::new().unwrap();
+        let content = r###"{
+        "name": "tester",
+        "version": "0.1.0-rc.0",
+        "dependencies": {}
+        }"###;
+        std::fs::write(&file, content).unwrap();
+
+        set_version(&file, "1.2.3-rc.4").unwrap();
+
+        let expected = r###"{
+  "name": "tester",
+  "version": "1.2.3-rc.4",
+  "dependencies": {}
 }"###
             .to_string();
         assert_eq!(std::fs::read_to_string(file).unwrap(), expected);