Find the k or of an array

#[test]
fn t1() {
    let start = std::time::Instant::now();
    let val = Solution::find_k_or(vec![7, 12, 9, 8, 9, 15], 4);
    let expected = 9;
    log_result!(val == expected, "t1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t2() {
    let start = std::time::Instant::now();
    let val = Solution::find_k_or(vec![2, 12, 1, 11, 4, 5], 6);
    let expected = 0;
    log_result!(val == expected, "t2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t3() {
    let start = std::time::Instant::now();
    let val = Solution::find_k_or(vec![10, 8, 5, 9, 11, 6, 8], 1);
    let expected = 15;
    log_result!(val == expected, "t3", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t4() {
    let start = std::time::Instant::now();
    let val = Solution::find_k_or(vec![3, 3, 3], 3);
    let expected = 3;
    log_result!(val == expected, "t4", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t5() {
    let start = std::time::Instant::now();
    let val = Solution::find_k_or(vec![255], 1);
    let expected = 255;
    log_result!(val == expected, "t5", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t6() {
    let start = std::time::Instant::now();
    let val = Solution::find_k_or(vec![6, 5], 2);
    let expected = 4;
    log_result!(val == expected, "t6", start, &expected, &val);
    assert_eq!(val, expected);
}