diff --git a/daemon/src/server.rs b/daemon/src/server.rs
index 26cc063..97fc1e0 100644
--- a/daemon/src/server.rs
+++ b/daemon/src/server.rs
@@ -568,6 +568,10 @@ mod tests {
 
         let zip_reader = ZipFileReader::new(body_bytes.to_vec()).await.unwrap();
         let zip_reader_file = zip_reader.file();
+        // sanity check that our ZIP has no empty files
+        for entry in zip_reader_file.entries() {
+            assert_ne!(entry.uncompressed_size(), 0);
+        }
         let filenames: Vec<String> = zip_reader_file.entries()
             .iter()
             .map(|entry| entry.filename().as_str().unwrap().to_string())