@Override
            public byte[] apply(Object t) {
                return t.toString().getBytes();
            }
        };

        // ## Act ##
        resultData.setSerializer(serializer);

        // ## Assert ##
        assertNotNull(resultData.serializer);

        resultData.setRawData("hoge");
        assertEquals("hoge", new String(resultData.getData()));
    }

    public Object getRawData() {
        return rawData;
    }

    /**
     * Set the serializer.
     * @param serializer the serializer function to convert raw data to byte array
     */
    public void setSerializer(final Function<Object, byte[]> serializer) {
        this.serializer = serializer;
    }

    /**
     * Get the data.
     * @return data
     */
    public byte[] getData() {
        if (data == null) {