So I created a log function so I can see the date of every action. I now want to unittest them. Because the function uses a void, I can't test the output. 

I might change the void to a String, but then the point of using it as a void would be gone!

What are my options?

```
public class Logger {

    public static void log(String s) {
        Date d = new Date();
        SimpleDateFormat ft =
                 new SimpleDateFormat ("yyyy.MM.dd '-' hh:mm:ss");
        System.out.println("[" + ft.format(d) + "]: " + s);
    }

}

```

JUnit

```
@Test
public void testLoggerEmptyString() {
    String s = "";
    log(s);
}

```

Thanks :D