mongo/jstests/core/query1.js

t = db.query1;
t.drop();

t.save({num: 1});
t.save({num: 3});
t.save({num: 4});

num = 0;
total = 0;

t.find().forEach(function(z) {
    num++;
    total += z.num;
});

assert.eq(num, 3, "num");
assert.eq(total, 8, "total");

assert.eq(3, t.find().comment("this is a test").itcount(), "B1");
assert.eq(3, t.find().comment("this is a test").count(), "B2");

assert.eq(3, t.find().comment("yo ho ho").itcount(), "C1");
assert.eq(3, t.find().comment("this is a test").count(), "C2");