mongodb/jstests/replsets/priority_takeover_cascading_priorities.js

// Multiple voting members with varying levels of priority.
// 5-node replica set with priorities 5, 4, 3, 2 and 1 (default).
// Start replica set. Ensure that highest priority node becomes primary eventually.
// Shut down the primary and confirm that the next highest priority node becomes primary.
// Repeat until 3 nodes are left standing.
(function() {
'use strict';
load('jstests/replsets/rslib.js');

var name = 'priority_takeover_cascading_priorities';
var replSet = new ReplSetTest({
    name: name,
    nodes: [
        {rsConfig: {priority: 5}},
        {rsConfig: {priority: 4}},
        {rsConfig: {priority: 3}},
        {rsConfig: {priority: 2}},
        {rsConfig: {priority: 1}},
    ]
});
replSet.startSet();
replSet.initiate();

replSet.waitForState(0, ReplSetTest.State.PRIMARY);
// Wait until all nodes get the "no-op" of "new primary" after initial sync.
waitUntilAllNodesCaughtUp(replSet.nodes);
replSet.stop(0);

replSet.waitForState(1, ReplSetTest.State.PRIMARY);
replSet.stop(1);

replSet.waitForState(2, ReplSetTest.State.PRIMARY);

// Cannot stop any more nodes because we will not have a majority.
replSet.stopSet();
})();