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/*
* Test that $concating empty string works correctly. May be extended in the future to include
* more thorough testing of $concat.
*/
(function() {
"use strict";
const coll = db.concat;
coll.drop();
assert.commandWorked(coll.insert({}));
assert.eq(coll.findOne({}, {_id: false, "a": {$concat: [{$toLower: "$b"}]}}), {a: ""});
assert.eq(coll.findOne({}, {_id: false, "a": {$concat: []}}), {a: ""});
})();
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