Android unit test for Enum type

I came across something strange. Example of function:

public class F {
  public enum Pawn {Black, White}

  public Pawn x;
  public F(){
      this.x = Pawn.Black;
  }
  public Pawn test(){
      return this.x;
  }
}

Unit test for this:

import junit.framework.Assert;
import junit.framework.TestCase;

import <package ... >.F;

public class FTest extends TestCase {
    public void testValue(){
        F mF = new F();
        Assert.assertSame(Pawn.Black, mF.test());
    }
}

And JUnit output:

junit.framework.AssertionFailedError: expected same:<Black> was not:<Black>

Expected :Black
Actual   :Black

Black is not black and is black. It's black magic. :/ What can I do to make this work (i.e. pass test)?