// Testing documents that contain empty field names. This was written as part of
// SERVER-86619.
const coll = db[jsTestName()];
coll.drop();

const kNumDocs = 50;

for (let i = 0; i < 50; ++i) {
    assert.commandWorked(coll.insert({"": 123, "b": 456, sortField: i}));
}

assert.eq(
    coll.aggregate([{$sort: {sortField: 1}}, {$addFields: {"m": {$meta: "sortKey"}}}, {$match: {"b": 456}}]).itcount(),
    kNumDocs,
);