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// Tests for $array expression.
(function() {
"use strict";
let coll = db.array_expr;
coll.drop();
function assertArray(expArray, ...inputs) {
assert(coll.drop());
if (inputs.length == 0) {
assert.commandWorked(coll.insert({}));
} else if (inputs.length == 1) {
assert.commandWorked(coll.insert({a: inputs[0]}));
} else {
assert.commandWorked(coll.insert({a: inputs[0], b: inputs[1]}));
}
const result = coll.aggregate([{$project: {out: ["$a", "$b"]}}]).toArray()[0].out;
assert.eq(result, expArray);
}
assertArray([1, 2], 1, 2);
assertArray([null, null], null, null);
assertArray(["TestInput", null], "TestInput", null);
assertArray([{a: 1, b: 2}, [1, 2]], {a: 1, b: 2}, [1, 2]);
assertArray(["TestInput", null], "TestInput");
assertArray([null, null]);
// no arg
assert(coll.drop());
assert.commandWorked(coll.insert({}));
let result = coll.aggregate([{$project: {out: []}}]).toArray()[0].out;
assert.eq(result, []);
}());
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