public function testIsNotEmpty()
 {
     $constraintList = new ConstraintList(array(new SingleValueConstraint()));
     $this->assertFalse($constraintList->isEmpty());
 }
 /**
  * @see Comparable::equals
  *
  * @param ConstraintList $constraintList
  *
  * @return bool
  */
 public function equals($constraintList)
 {
     if (!$constraintList instanceof self) {
         return false;
     }
     if ($this->count() !== $constraintList->count()) {
         return false;
     }
     return $this->constraintsEqual($constraintList->constraints);
 }