Final value of variable after performing operations

#[test]
fn test_all_decrement() {
    let start = std::time::Instant::now();
    let val = Solution::final_value_after_operations(vec!["X--".to_string(), "--X".to_string()]);
    let expected = -2;
    log_result!(val == expected, "test_all_decrement", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_all_increment() {
    let start = std::time::Instant::now();
    let val = Solution::final_value_after_operations(vec!["X++".to_string(), "X++".to_string(), "X++".to_string()]);
    let expected = 3;
    log_result!(val == expected, "test_all_increment", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_basic1() {
    let start = std::time::Instant::now();
    let val = Solution::final_value_after_operations(vec!["--X".to_string(), "X++".to_string(), "X++".to_string()]);
    let expected = 1;
    log_result!(val == expected, "test_basic1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_basic2() {
    let start = std::time::Instant::now();
    let val = Solution::final_value_after_operations(vec!["++X".to_string(), "++X".to_string(), "X++".to_string()]);
    let expected = 3;
    log_result!(val == expected, "test_basic2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_zero() {
    let start = std::time::Instant::now();
    let val = Solution::final_value_after_operations(vec!["X++".to_string(), "++X".to_string(), "--X".to_string(), "X--".to_string()]);
    let expected = 0;
    log_result!(val == expected, "test_zero", start, &expected, &val);
    assert_eq!(val, expected);
}