public static List<Event> computeEventDiff(final Params params) {
        final List<Event> events = new ArrayList<>();

        emitPerNodeDiffEvents(createBaselineParams(params), events);
        emitWholeClusterDiffEvent(createBaselineParams(params), events);
        emitDerivedBucketSpaceStatesDiffEvents(params, events);
        return events;
    }
@Test
    void multiple_node_state_transitions_emit_multiple_node_state_events() {
        final EventFixture fixture = EventFixture.createForNodes(3)
                .clusterStateBefore("distributor:3 storage:3 .1.s:d")
                .clusterStateAfter("distributor:3 .2.s:d storage:3 .0.s:r");

        final List<Event> events = fixture.computeEventDiff();
        assertThat(events.size(), equalTo(3));
        assertThat(events, hasItem(allOf(
                eventForNode(distributorNode(2)),
                nodeEventWithDescription("Altered node state in cluster state from 'U' to 'D'"))));
        assertThat(events, hasItem(allOf(
                eventForNode(storageNode(0)),
                nodeEventWithDescription("Altered node state in cluster state from 'U' to 'R'"))));
        assertThat(events, hasItem(allOf(
                eventForNode(storageNode(1)),
                nodeEventWithDescription("Altered node state in cluster state from 'D' to 'U'"))));
    }