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path: root/jstests/core/query/inc/inc2.js
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let t = db.inc2;
t.drop();

t.save({_id: 1, x: 1});
t.save({_id: 2, x: 2});
t.save({_id: 3, x: 3});

function order() {
    return t.find().sort({x: 1}).map(function(z) {
        return z._id;
    });
}

assert.eq("1,2,3", order(), "A");

t.update({_id: 1}, {$inc: {x: 4}});
assert.eq("2,3,1", order(), "B");

t.createIndex({x: 1});
assert.eq("2,3,1", order(), "C");

t.update({_id: 3}, {$inc: {x: 4}});
assert.eq("2,1,3", order(), "D");