mongodb/jstests/replsets/oplog_term.js

// Term counter should be present in oplog entries under protocol version 1.
(function() {
'use strict';
load('jstests/replsets/rslib.js');

var name = 'oplog_term';
var replSet = new ReplSetTest({name: name, nodes: 1});
replSet.startSet();
replSet.initiate();
replSet.waitForState(replSet.nodes[0], ReplSetTest.State.PRIMARY, 5 * 1000);

// Default protocol version is 1 - 'term' field should present in oplog entry.
var primary = replSet.getPrimary();
var collection = primary.getDB('test').getCollection(name);
assert.writeOK(collection.save({_id: 1}));

var oplogEntry = getLatestOp(primary);
assert(oplogEntry, 'unexpected empty oplog');
assert.eq(collection.getFullName(),
          oplogEntry.ns,
          'unexpected namespace in oplog entry: ' + tojson(oplogEntry));
assert.eq(1,
          oplogEntry.o._id,
          'oplog entry does not refer to most recently inserted document: ' + tojson(oplogEntry));
assert(oplogEntry.hasOwnProperty('t'), 'oplog entry must contain term: ' + tojson(oplogEntry));

var status = assert.commandWorked(primary.adminCommand({replSetGetStatus: 1}));
assert.eq(status.term,
          oplogEntry.t,
          'term in oplog entry does not match term in status: ' + tojson(oplogEntry));

replSet.stopSet();
})();