If list_all_local_sessions.js and list_all_local_sessions.js run in parallel, a check in list_all_local_sessions.js may fail.

    function listMyLocalSessions() {
        return db.aggregate([{'$listLocalSessions': {users: [myusername]}}]);
    }
    const myArray = assert.doesNotThrow(listMyLocalSessions).toArray();
    assert.eq(myArray.length, resultArray.length);

Other tests may use the same user, because a value is needed in the no-auth case. This check should be made aware of this possibility.