double z = a.updateAndGet(value -> value - y);
        assertBitEquals(x - y, z);
        assertBitEquals(x - y, a.get());
      }
    }
  }

  /** a deserialized serialized atomic holds same value */
  public void testSerialization() throws Exception {
    AtomicDouble a = new AtomicDouble();
    AtomicDouble b = serialClone(a);
    assertNotSame(a, b);
    a.set(-22.0);

        AtomicDouble a = new AtomicDouble(x);
        double z = a.addAndGet(y);
        assertBitEquals(x + y, z);
        assertBitEquals(x + y, a.get());
      }
    }
  }

  /** a deserialized serialized atomic holds same value */
  public void testSerialization() throws Exception {
    AtomicDouble a = new AtomicDouble();
    AtomicDouble b = serialClone(a);
    assertNotSame(a, b);
    a.set(-22.0);