diff --git a/tests/models_test.rs b/tests/models_test.rs
new file mode 100644
index 0000000..6142875
--- /dev/null
+++ b/tests/models_test.rs
@@ -0,0 +1,54 @@
+#[cfg(test)]
+mod tests {
+    use crate::models::{AuthorStats, CommitFrequency, RepositoryInfo};
+    use serde_json;
+
+    #[test]
+    fn test_author_stats_serde() {
+        let stats = AuthorStats {
+            name: "Test User".to_string(),
+            email: "test@example.com".to_string(),
+            commits: 10,
+            lines_added: 100,
+            lines_removed: 50,
+            net_change: 50,
+            files_changed: 5,
+            first_commit: "2024-01-01T00:00:00Z".to_string(),
+            last_commit: "2024-01-15T00:00:00Z".to_string(),
+            active_days: 5,
+            average_commits_per_day: 2.0,
+            busiest_day: "Monday".to_string(),
+            busiest_day_count: 5,
+            commit_messages: vec!["feat: add feature".to_string()],
+        };
+
+        let json = serde_json::to_string(&stats).unwrap();
+        let deserialized: AuthorStats = serde_json::from_str(&json).unwrap();
+        assert_eq!(deserialized.name, stats.name);
+        assert_eq!(deserialized.commits, stats.commits);
+    }
+
+    #[test]
+    fn test_repository_info_serde() {
+        let info = RepositoryInfo {
+            path: "/test/repo".to_string(),
+            branch: Some("main".to_string()),
+            remote_url: Some("https://github.com/test/repo".to_string()),
+            total_commits: 100,
+            total_authors: 5,
+            repository_age_days: 365,
+        };
+
+        let json = serde_json::to_string(&info).unwrap();
+        let deserialized: RepositoryInfo = serde_json::from_str(&json).unwrap();
+        assert_eq!(deserialized.path, info.path);
+        assert_eq!(deserialized.total_commits, info.total_commits);
+    }
+
+    #[test]
+    fn test_commit_frequency_defaults() {
+        let freq = CommitFrequency::default();
+        assert_eq!(freq.total_commits, 0);
+        assert_eq!(freq.commits_per_day, 0.0);
+    }
+}