JUnit Eclipse

Hello,
I have two packages in one Project.  In the first package I have a java file that contains "main," and in the other java file I have the code I am working with.  I am running them as "Java Application," but I wish to run them as a JUnit.  If I would have started the java files off as JUnits from the beginning I would not have this problem now.  So I need to convert the java files I now have to run as JUnit.  How shall I do this.  I have tried setting the Debug Configuration, but I run into one problem or the other.
chimaAsked:
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Ajay-SinghConnect With a Mentor Commented:
> How would I add another extention

You can't do that. Java doesn't support multiple inheritance.
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Ajay-SinghCommented:
In eclipse, you can select a folder and right click->New->Junit Testcase
More on how to write testcase http://www.thekirschners.com/articles/how-to-write-test-cases.html
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muktajindalConnect With a Mentor Commented:
Are you extending TestCase class ?
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chimaAuthor Commented:
Ajay-Singh, I am looking more for the Eclipse setting of the "Run Configuration" or the "Debug Configurtation.  I think it is more the Debug Configuration."

muktajindal, If I had started with JUnit I would not have this problem.  Of course I could set it up as JUnit and copy the code over, but I wanted to learn how to get from a Java run as "Java Application" to "Run as JUnit."  I have seen it done once, but when I go to do it, I run into a couple of different problems.  One says; No test for JUnit 4 or 3.  And the other just does not let me select the java file I want.
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chimaAuthor Commented:
Now I see what you mean by "extending Testcase" and yes this was the problem.  Now I have a related problem, which I found a web site explaining "multiple inheritance."  I see that it is not straight forward, so I wanted to ask; I have  public class XmlTest extends XMLTestCase.  How would I add another extention, i.e., public class XmlTest extends Fixture, XMLTestCase
Extending or adding Fixture
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chimaAuthor Commented:
Ajay-Singh, not directly, but it is possible, right?  http://pclc.pace.edu/~bergin/patterns/multipleinheritance.html explains how, or at least I think it does.  I have not had time to read through it.
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Ajay-SinghCommented:
It is possible for interfaces (which are not concrete classes), not for concrete classes. I was referring to
concrete classes, where there is no multiple inheritance.
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chimaAuthor Commented:
thanks, more to come
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