Count subarrays of length three with a condition

#[test]
fn test_exact_condition() {
    let start = std::time::Instant::now();
    let val = Solution::count_subarrays(vec![1, 4, 1, 2, 8, 2]);
    let expected = 2;
    log_result!(val == expected, "test_exact_condition", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example1() {
    let start = std::time::Instant::now();
    let val = Solution::count_subarrays(vec![1, 2, 1, 4, 1]);
    let expected = 1;
    log_result!(val == expected, "test_example1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example2() {
    let start = std::time::Instant::now();
    let val = Solution::count_subarrays(vec![1, 1, 1]);
    let expected = 0;
    log_result!(val == expected, "test_example2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_multiple_matches() {
    let start = std::time::Instant::now();
    let val = Solution::count_subarrays(vec![2, 4, 2, 2, 4, 2]);
    let expected = 0;
    log_result!(val == expected, "test_multiple_matches", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_no_triples() {
    let start = std::time::Instant::now();
    let val = Solution::count_subarrays(vec![1, 2]);
    let expected = 0;
    log_result!(val == expected, "test_no_triples", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_zeros() {
    let start = std::time::Instant::now();
    let val = Solution::count_subarrays(vec![0, 0, 0]);
    let expected = 1;
    log_result!(val == expected, "test_zeros", start, &expected, &val);
    assert_eq!(val, expected);
}