Re: unit testing private methods

hi
i am trying out PrivilegedAccessor class (of http://sourceforge.net/projects/privaccessor/)
along with junit to test some private methods that process double[]
[] .I think this uses reflection to access private methods

public class MyClass {
    private double[] processArray(double[] inarray){
     double[] ret=new double[inarray.length];
     for(int i=0;i<inarray.length;i++){
     ret[i]=inarray[i]+100.0;
     }
     return ret;
    }
}

here is the testcase class
<code>
import junit.framework.TestCase;
import junit.extensions.PrivilegedAccessor;

public class MyClassTest extends TestCase{
    public MyClassTest(String name){
        super(name);
    }
        public void testMyClass()throws Exception{
        MyClass mc=new MyClass();
        assertNotNull(mc);

                double[] inputarray=new double[]{1.1,2.2,3.3,4.4};
        double[] ans=new double[]{101.1,102.2,103.3,104.4};
        double[] outputarray=(double[])
(PrivilegedAccessor.invokeMethod(mc,"processArray(double[])",inputarray));
        assertEquals(outputarray,ans);

       }
}

<code>

when i run the test ,i get an error message like

java.lang.NoSuchMethodException: Method 'processArray(double[])'s
parameter nr1 (double[]) not found

This error originates at the call PrivilegedAccessor.invokeMethod(..)
can someone tell me why this happens?

thanks
jim