test detection of dual bit errors with hemming

lib-bms-protocol/src/types.rs

@@ -343,4 +343,14 @@ mod base_type_tests {
             assert_eq!(invalid_hemming^hc, hemming);
         }
     }
+
+    #[test]
+    fn hemming_dual_bit_error_detection() {
+        let data = 0x123456;
+        let hemming = calc_hemming(data);
+        let bit_error = 0x101;
+        let correction = check_hemming(data ^ bit_error, hemming).unwrap_err();
+        let (dc, hc) = correction.calc_correction_data();
+        assert!(check_hemming(data ^ dc, hemming ^ hc).is_err())
+    }
 }