test(tvix/castore/refscan): add empty pattern regression test r/8748

Change-Id: I165261170edaabfc56f6ac0a6baae388332b3f73
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12559
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>
Autosubmit: yuka <yuka@yuka.dev>

1 files changed, 16 insertions, 0 deletions

diff --git a/tvix/castore/src/refscan.rs b/tvix/castore/src/refscan.rs
index 8e6a81b2a4fe..352593020472 100644
--- a/tvix/castore/src/refscan.rs
+++ b/tvix/castore/src/refscan.rs
@@ -334,5 +334,21 @@ mod tests {
         }
     }
 
+    #[tokio::test]
+    async fn test_reference_reader_no_patterns() {
+        let pattern = ReferencePattern::new(Vec::<&str>::new());
+        let scanner = ReferenceScanner::new(pattern);
+        let mut mock = Builder::new();
+        mock.read(HELLO_DRV.as_bytes());
+        let mock = mock.build();
+        let mut reader = ReferenceReader::new(&scanner, mock);
+        let mut s = String::new();
+        reader.read_to_string(&mut s).await.unwrap();
+        assert_eq!(s, HELLO_DRV);
+
+        let result = scanner.finalise();
+        assert_eq!(result.len(), 0);
+    }
+
     // FUTUREWORK: Test with large file
 }