@Test
    void published_distribution_bit_bound_by_low_watermark_when_nodes_report_less_than_config_bits() {
        assertThat(do_test_distribution_bit_watermark(5, 5),
                equalTo("bits:5 distributor:3 storage:3"));
        assertThat(do_test_distribution_bit_watermark(5, 6),
                equalTo("bits:5 distributor:3 storage:3"));
        assertThat(do_test_distribution_bit_watermark(5, 15),
                equalTo("bits:5 distributor:3 storage:3"));
    }
Distribution bit increases should not take place incrementally. Doing so would
let e.g. a transition from 10 bits to 20 bits cause 10 interim full re-distributions.
clustercontroller-core/src/test/java/com/yahoo/vespa/clustercontroller/core/ClusterStateGeneratorTest.java