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// SERVER-23029 added a new expression, $reverseArray, which consumes an array or a nullish value
// and produces either the reversed version of that array, or null. In this test file, we check the
// behavior and error cases.
load("jstests/aggregation/extras/utils.js"); // For assertErrorCode.
(function() {
"use strict";
var coll = db.reverseArray;
coll.drop();
// We need a document to flow through the pipeline, even though we don't care what fields it
// has.
coll.insert({});
assertErrorCode(coll, [{$project: {reversed: {$reverseArray: 1}}}], 34435);
var res = coll.aggregate([{$project: {reversed: {$reverseArray: {$literal: [1, 2]}}}}]);
var output = res.toArray();
assert.eq(1, output.length);
assert.eq(output[0].reversed, [2, 1]);
var res = coll.aggregate([{$project: {reversed: {$reverseArray: {$literal: [[1, 2]]}}}}]);
var output = res.toArray();
assert.eq(1, output.length);
assert.eq(output[0].reversed, [[1, 2]]);
var res = coll.aggregate([{$project: {reversed: {$reverseArray: "$notAField"}}}]);
var output = res.toArray();
assert.eq(1, output.length);
assert.eq(output[0].reversed, null);
}());
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