public ChannelUriStringBuilder nakDelay(final String nakDelay)
    {
        this.nakDelay = null != nakDelay ? parseDuration(NAK_DELAY_PARAM_NAME, nakDelay) : null;
        return this;
    }
@Test
    void shouldRejectInvalidNakDelay()
    {
        assertThrows(IllegalArgumentException.class, () -> new ChannelUriStringBuilder().nakDelay("foo"));
    }