Build Fehler (cannot find the symbol)

Error while compiling with exit status 1
src/tetris/tests/MyTetrisTest.java:11: error: cannot find symbol
import tetris.game.pieces.MyPieceFactory;
                         ^
  symbol:   class MyPieceFactory
  location: package tetris.game.pieces
src/tetris/tests/MyTetrisTest.java:13: error: cannot find symbol
import tetris.game.pieces.MyPiece;
                         ^
  symbol:   class MyPiece
  location: package tetris.game.pieces
src/tetris/tests/MyTetrisTest.java:31: error: cannot find symbol
		MyPieceFactory mf = new MyPieceFactory(r);
		^
  symbol:   class MyPieceFactory
  location: class MyTetrisTest
src/tetris/tests/MyTetrisTest.java:31: error: cannot find symbol
		MyPieceFactory mf = new MyPieceFactory(r);
		                        ^
  symbol:   class MyPieceFactory
  location: class MyTetrisTest
4 errors

I get this error on staticstic page and cannot understand what’s the error.

From MyTetrisTest.java:

/**
 * Within this class and/or package you can implement your own tests.
 *
 * Note that no classes or interfaces will be available, except those initially
 * provided. Make use of {@link MyTetrisFactory} to get other factory instances.
 */

You can only use MyTetrisFactory. But you can use this factory to create other factories.

Note: You probably want to create a new test file for your tests for a better overview (instead of writing the tests in MyTetrisTest.java).