Single element in a sorted array

#[test]
fn t1() {
    let s = std::time::Instant::now();
    let v = Solution::single_non_duplicate(vec![1,1,2,3,3,4,4,8,8]);
    log_result!(v == 2, "t1", s, 2, v);
    assert_eq!(v, 2);
}

#[test]
fn t2() {
    let s = std::time::Instant::now();
    let v = Solution::single_non_duplicate(vec![3,3,7,7,10,11,11]);
    log_result!(v == 10, "t2", s, 10, v);
    assert_eq!(v, 10);
}

#[test]
fn t3() {
    // Single element array
    let s = std::time::Instant::now();
    let v = Solution::single_non_duplicate(vec![1]);
    log_result!(v == 1, "t3", s, 1, v);
    assert_eq!(v, 1);
}

#[test]
fn t4() {
    // Single element at end
    let s = std::time::Instant::now();
    let v = Solution::single_non_duplicate(vec![1,1,2,2,3]);
    log_result!(v == 3, "t4", s, 3, v);
    assert_eq!(v, 3);
}

#[test]
fn t5() {
    // Single element at start
    let s = std::time::Instant::now();
    let v = Solution::single_non_duplicate(vec![1,2,2,3,3]);
    log_result!(v == 1, "t5", s, 1, v);
    assert_eq!(v, 1);
}