增加环境变量

tests/test_ccr.rs

@@ -62,6 +62,21 @@ fn find_latest_ccr_file_picks_latest_date_dir_first() {
     assert_eq!(latest, newer);
 }
 
+#[test]
+fn find_latest_ccr_file_skips_latest_empty_dir() {
+    let root = tempdir().expect("create temp root dir");
+    let older_dir = root.path().join("run_0011");
+    let newer_empty_dir = root.path().join("run_0012");
+    fs::create_dir_all(&older_dir).expect("create older dir");
+    fs::create_dir_all(&newer_empty_dir).expect("create newer empty dir");
+
+    let expected = older_dir.join("20260401T000001Z-a.ccr");
+    fs::write(&expected, b"older").expect("write older ccr");
+
+    let latest = find_latest_ccr_file(root.path()).expect("find latest ccr");
+    assert_eq!(latest, expected);
+}
+
 #[test]
 fn snapshot_to_payloads_with_options_skips_invalid_aspa_when_not_strict() {
     let snapshot = ParsedCcrSnapshot {