You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: secure_comparator.rs
    path of file: ./repos/themis/tests/rust
    
    the code of the file until where you have to start completion: // Copyright 2018 (c) rust-themis developers
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitat
    
fn reusing_comparators() {
    // TODO: avoid reusing comparators via a better API
    let mut comparator1 = SecureComparator::new();
    let mut comparator2 = SecureComparator::new();

    comparator1.append_secret(b"test").unwrap();
    comparator2.append_secret(b"data").unwrap();

    let data = comparator1.begin_compare().unwrap();
    let data = comparator2.proceed_compare(&data).unwrap();
    let data = comparator1.proceed_compare(&data).unwrap();
    let data = comparator2.proceed_compare(&data).unwrap();
    let _ata = comparator1.proceed_compare(&data).unwrap();

    assert!(!comparator1.result().unwrap());
    assert!(!comparator2.result().unwrap());

    // You can't append more data and restart the comparison after it is complete.
    assert!(comparator1.append_secret(b"something").is_err());
    assert!(comparator2.begin_compare().is_err());

    // Though you can still view the previous results as much as you wish.
    assert!(comparator1.is_complete());
    assert!(comparator2.is_complete());
    assert!(!comparator1.result().unwrap());
    assert!(!comparator2.result().unwrap());
}