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: observable_vec_deque_tests.rs
    path of file: ./repos/deep_causality/deep_causality/tests/extensions/observable
    
    the code of the file until where you have to start completion: // SPDX-License-Identifier: MIT
// Copyright (c) "2023" . The DeepCausality Authors. All Rights Reserved.

use std::collections::VecDeque;

use dee
    
fn test_percent_non_observation() {
    let observations = get_test_obs_vec_deque();
    let target_threshold = 10.0;
    let target_effect = 1.0;
    let percent_non_observation =
        observations.percent_non_observation(target_threshold, target_effect);
    assert_eq!(0.4, percent_non_observation);
}