@Test
 public void testEqualsObject() {
   final Double[][] a = new Double[][] {{1.0, 1.0, 1.0}, {2.0, 2.0, 2.0}, {3.0, 3.0, 3.0}};
   assertTrue(matrixA.equals(new SquareMatrix<Double>(a)));
   assertFalse(matrixA.equals(matrixB));
 }