Help requested - testing a class with a tester class, no methods allowed.

**miketeezie** · February 21st, 2011, 09:37 PM

I have an assignment where I am to test a class I've written by writing another class called Tester. Tester can have no instance variables or methods, everything has to be done in one constructor.

If I need to share the main class I will, but I'd rather just try to describe my issue so I can get the methodology, and try to figure out what to do on my own.

Here's the two methods of interest that I am trying to test:

public void setTime(int hour, int minute)
    {
        hours.setValue(hour);
        minutes.setValue(minute);
        updateDisplay();
        updateDisplayUS();
    }
 
public String getUSTime()
    {
        return displayStringUS;
    }

What Tester needs to do is print out what is stored in displayStringUS to check it against the time I have entered into clock.setTime() in my Tester class:

public Tester()
    {
        ClockDisplay clock = new ClockDisplay();
 
        clock.setTime(00, 00);
        clock.getUSTime();
        System.out.println(*****);
     }

In a nutshell, I'm trying to test what is entered in clock.setTime manually against what the code from the ClockDisplay class generates. I need to do this for 8 separate time tests.

I have no idea how to do this. I've Googled for an hour now, but I guess I just simply lack the vocabulary at this point to search for the proper syntax.

**aussiemcgr** · February 21st, 2011, 09:49 PM

Ok, so I guess my question would be: Is tester supposed to be an object or the executing class (the main)?

As for this code:

public Tester()
    {
        ClockDisplay clock = new ClockDisplay();
 
        clock.setTime(00, 00);
        clock.getUSTime();
        System.out.println(*****);
     }

Consider your ClockDisplay.getUSTime() method. This method returns a String, and that is all it does. You call this method in the code above, but you do not capture the value returned by this method.

To capture the value, then print it out, you want to say:

String value = clock.getUSTime();
System.out.println(value);

If your teacher wants you to not set the result to a variable (ignore that this is bad practice) and instead just print out the result, you would say:

System.out.println(clock.getUSTime());

Am I anywhere near what you are asking or did I miss the mark?

**javapenguin** · February 21st, 2011, 09:57 PM

Hmmmmm....well I compiled and that settles it.

Your Tester class won't do much.

I tried to run a class I quickly made up that just printed something out and it refused to run without a main method.

Are you making an applet by an chance?

If not, you must have at least 1 method to get Tester to do anything other than return

java.lang.NoSuchMethodError: main:
Exception in thread "main"

public Tester()
    {
public static void main(String[] args)
{
        ClockDisplay clock = new ClockDisplay();
 
        clock.setTime(00, 00);
      String str =   clock.getUSTime();
        System.out.println(str);
}
     }

**miketeezie** · February 21st, 2011, 10:40 PM

System.out.println(clock.getUSTime());

That's it exactly! I didn't realize the compiler would allow you to put the all that into a print statement.

My Tester class now verifies that my methods from my main ClockDisplay class do indeed work, and prints them out to the terminal.

Thanks so much! I'm learning a ton here.

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