ut: add test for Snapshot

crates/paimon/src/spec/snapshot.rs

@@ -135,3 +135,96 @@ impl Snapshot {
         self.statistics.as_deref()
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_snapshot_creation() {
+        let snapshot = Snapshot::builder()
+            .version(1)
+            .id(1001)
+            .schema_id(2002)
+            .base_manifest_list("base_manifest_list".to_string())
+            .delta_manifest_list("delta_manifest_list".to_string())
+            .commit_user("user1".to_string())
+            .build();
+
+        assert_eq!(snapshot.version(), 1);
+        assert_eq!(snapshot.id(), 1001);
+        assert_eq!(snapshot.schema_id(), 2002);
+        assert_eq!(snapshot.base_manifest_list(), "base_manifest_list");
+        assert_eq!(snapshot.delta_manifest_list(), "delta_manifest_list");
+        assert_eq!(snapshot.commit_user(), "user1");
+        assert!(snapshot.changelog_manifest_list().is_none());
+        assert!(snapshot.index_manifest().is_none());
+        assert!(snapshot.total_record_count().is_none());
+        assert!(snapshot.delta_record_count().is_none());
+        assert!(snapshot.changelog_record_count().is_none());
+        assert!(snapshot.watermark().is_none());
+        assert!(snapshot.statistics().is_none());
+    }
+
+    #[test]
+    fn test_snapshot_with_optional_fields() {
+        let snapshot = Snapshot::builder()
+            .version(2)
+            .id(1002)
+            .schema_id(2003)
+            .base_manifest_list("base_manifest_list_v2".to_string())
+            .delta_manifest_list("delta_manifest_list_v2".to_string())
+            .changelog_manifest_list(Some("changelog_manifest_list_v2".to_string()))
+            .index_manifest(Some("index_manifest_list_v2".to_string()))
+            .commit_user("user2".to_string())
+            .total_record_count(Some(500))
+            .delta_record_count(Some(200))
+            .changelog_record_count(Some(50))
+            .watermark(Some(123456789))
+            .statistics(Some("statistics_v2".to_string()))
+            .build();
+
+        assert_eq!(snapshot.version(), 2);
+        assert_eq!(snapshot.id(), 1002);
+        assert_eq!(snapshot.schema_id(), 2003);
+        assert_eq!(snapshot.base_manifest_list(), "base_manifest_list_v2");
+        assert_eq!(snapshot.delta_manifest_list(), "delta_manifest_list_v2");
+        assert_eq!(
+            snapshot.changelog_manifest_list(),
+            Some("changelog_manifest_list_v2")
+        );
+        assert_eq!(snapshot.index_manifest(), Some("index_manifest_list_v2"));
+        assert_eq!(snapshot.commit_user(), "user2");
+        assert_eq!(snapshot.total_record_count(), Some(500));
+        assert_eq!(snapshot.delta_record_count(), Some(200));
+        assert_eq!(snapshot.changelog_record_count(), Some(50));
+        assert_eq!(snapshot.watermark(), Some(123456789));
+        assert_eq!(snapshot.statistics(), Some("statistics_v2"));
+    }
+
+    #[test]
+    fn test_snapshot_default_values() {
+        let snapshot = Snapshot::builder()
+            .version(3)
+            .id(1003)
+            .schema_id(2004)
+            .base_manifest_list("base_manifest_list_v3".to_string())
+            .delta_manifest_list("delta_manifest_list_v3".to_string())
+            .commit_user("user3".to_string())
+            .build();
+
+        assert_eq!(snapshot.version(), 3);
+        assert_eq!(snapshot.id(), 1003);
+        assert_eq!(snapshot.schema_id(), 2004);
+        assert_eq!(snapshot.base_manifest_list(), "base_manifest_list_v3");
+        assert_eq!(snapshot.delta_manifest_list(), "delta_manifest_list_v3");
+        assert_eq!(snapshot.commit_user(), "user3");
+        assert!(snapshot.changelog_manifest_list().is_none());
+        assert!(snapshot.index_manifest().is_none());
+        assert!(snapshot.total_record_count().is_none());
+        assert!(snapshot.delta_record_count().is_none());
+        assert!(snapshot.changelog_record_count().is_none());
+        assert!(snapshot.watermark().is_none());
+        assert!(snapshot.statistics().is_none());
+    }
+}