Sum of two integers

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

#[test]
fn test_example_1() {
    let start = std::time::Instant::now();
    let val = Solution::get_sum(1, 2);
    let expected = 3;
    log_result!(val == expected, "test_example_1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn test_example_2() {
    let start = std::time::Instant::now();
    let val = Solution::get_sum(2, 3);
    let expected = 5;
    log_result!(val == expected, "test_example_2", start, &expected, &val);
    assert_eq!(val, expected);
}

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

#[test]
fn test_two_negative_numbers() {
    let start = std::time::Instant::now();
    let val = Solution::get_sum(-12, -8);
    let expected = -20;
    log_result!(val == expected, "test_two_negative_numbers", start, &expected, &val);
    assert_eq!(val, expected);
}