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Sorry, I don't know anything about how to use JUnit.

Shouldn't it be: t.setName("...");

I'm not familiar with JUnit.
The error message says there is a problem with your constructor.
Change the constructor to have zero-arguments, use the set method and see what happens.

Do you understand what the error message is saying?
Does your code have more than one constructor?
Does your constructor have any arguments?

Without the text of the error messages, its hard to say what the problem is.
Can you compile the code with the javac command and post the full text of the error messages here?