this.credit = credit;
    }

    /**
     * Gets the credit charge for this message.
     *
     * @return the creditCharge
     */
    public final int getCreditCharge() {
        return this.creditCharge;
    }

    @Override
    public void retainPayload() {
        this.retainPayload = true;
    }

    @Override
    public boolean isRetainPayload() {

            assertEquals(100, testMessage.getCredit());
        }

        @Test
        @DisplayName("Should get credit charge")
        void testCreditChargeProperty() {
            assertEquals(0, testMessage.getCreditCharge());
        }

        @Test
        @DisplayName("Should get and set read size")
        void testReadSizeProperty() {
            testMessage.setReadSize(1024);