public function testTwoValuesAreEqualWhenValueIsTheSame()
 {
     $value1 = new ValueObject("Hola");
     $value2 = new ValueObject("Hola");
     $valueNotEqual = new ValueObject("Adios");
     $this->assertTrue($value1->equals($value2));
     $this->assertFalse($value1->equals($valueNotEqual));
 }