diff --git a/tests/diff.rs b/tests/diff.rs
index b57a4bb..12200f4 100644
--- a/tests/diff.rs
+++ b/tests/diff.rs
@@ -66,9 +66,11 @@ fn run_diff_test<F: FnOnce(&[u8]) -> Vec<u8>>(test_dir: &str, name: &str, test:
 			}
 		}
 
-		dump(&expected_path, actual_wat.as_bytes()).expect("Failed to write to expected");
-
-		panic!();
+		if std::env::var_os("BLESS").is_some() {
+			dump(&expected_path, actual_wat.as_bytes()).expect("Failed to write to expected");
+		} else {
+			panic!();
+		}
 	}
 }