mongodb/jstests/noPassthroughWithMongod/ttl1.js

/**
 * Part 1: Simple test of TTL.  Create a new collection with 24 docs, with timestamps at one hour
 *         intervals, from now-minus-23 hours ago until now.  Also add some docs with non-date
 *         values.  Then create a TTL index that expires all docs older than a string. Wait 70
 *         seconds (TTL monitor runs every 60) and check that no documents were deleted.
 * Part 2: Add a second TTL index that expires all docs older than ~5.5 hours (20000
 *         seconds).  Wait 70 seconds and check that 18 docs deleted.
 * Part 3: Add a third TTL index on an identical field. The second index expires docs older than
 *         ~2.8 hours (10000 seconds). Wait 70 seconds and check that 3 more docs deleted.
 */

// Part 1
var t = db.ttl1;
t.drop();
t.runCommand("create", {flags: 0});
var now = (new Date()).getTime();

for (i = 0; i < 24; i++) {
    var past = new Date(now - (3600 * 1000 * i));
    t.insert({x: past, y: past, z: past});
}
t.insert({a: 1});      // no x value
t.insert({x: null});   // non-date value
t.insert({x: true});   // non-date value
t.insert({x: "yo"});   // non-date value
t.insert({x: 3});      // non-date value
t.insert({x: /foo/});  // non-date value

assert.eq(30, t.count());

sleep(70 * 1000);

assert.eq(t.count(), 30);

// Part 2
t.ensureIndex({x: 1}, {expireAfterSeconds: 20000});

assert.soon(function() {
    return t.count() < 30;
}, "TTL index on x didn't delete", 70 * 1000);

// We know the TTL thread has started deleting. Wait a few seconds to give it a chance to finish.
assert.soon(function() {
    return t.find({x: {$lt: new Date(now - (20000 * 1000))}}).count() === 0;
}, "TTL index on x didn't finish deleting", 5 * 1000);
assert.eq(12, t.count());

assert.lte(18, db.serverStatus().metrics.ttl.deletedDocuments);
assert.lte(1, db.serverStatus().metrics.ttl.passes);

// Part 3
t.ensureIndex({y: 1}, {expireAfterSeconds: 10000});

assert.soon(function() {
    return t.count() < 12;
}, "TTL index on y didn't delete", 70 * 1000);

assert.soon(function() {
    return t.find({y: {$lt: new Date(now - (10000 * 1000))}}).count() === 0;
}, "TTL index on y didn't finish deleting", 5 * 1000);
assert.eq(9, t.count());