mongodb/jstests/replsets/dbhash_system_collections.js

// Test that the dbhash command checks system collections that are replicated.
'use strict';

(function() {
var rst = new ReplSetTest({name: 'dbhash_system_collections', nodes: 2});
rst.startSet();
rst.initiate();

var primary = rst.getPrimary();
var secondary = rst.getSecondary();

var testDB = primary.getDB('test');
assert.commandWorked(testDB.system.users.insert({users: 1}));
assert.commandWorked(testDB.system.js.insert({js: 1}));

var adminDB = primary.getDB('admin');
assert.commandWorked(adminDB.system.roles.insert({roles: 1}));
assert.commandWorked(adminDB.system.version.insert({version: 1}));
assert.commandWorked(adminDB.system.new_users.insert({new_users: 1}));
assert.commandWorked(adminDB.system.backup_users.insert({backup_users: 1}));

rst.awaitReplication();

function checkDbHash(mongo) {
    var testDB = mongo.getDB('test');
    var adminDB = mongo.getDB('admin');

    var replicatedSystemCollections = [
        'system.js',
        'system.users',
    ];

    var replicatedAdminSystemCollections = [
        'system.backup_users',
        'system.keys',
        'system.new_users',
        'system.roles',
        'system.version',
    ];

    var res = testDB.runCommand('dbhash');
    assert.commandWorked(res);
    assert.docEq(Object.keys(res.collections), replicatedSystemCollections, tojson(res));

    res = adminDB.runCommand('dbhash');
    assert.commandWorked(res);
    assert.docEq(Object.keys(res.collections), replicatedAdminSystemCollections, tojson(res));

    return res.md5;
}

var primaryMd5 = checkDbHash(primary);
var secondaryMd5 = checkDbHash(secondary);
assert.eq(primaryMd5, secondaryMd5, 'dbhash is different on the primary and the secondary');
rst.stopSet();
})();