Function write

test/integration/change-streams/change_stream.test.ts:852–856

()

    let client, coll, changeStream;

    function write() {
      return Promise.resolve()
        .then(() => coll.insertOne({ a: 1 }))
        .then(() => coll.insertOne({ b: 2 }));
    }

    function lastWrite() {
      return coll.insertOne({ c: 3 });