/**
  * @dataProvider getPurchases
  * @param float $p
  * @param float $ds
  * @param float $er
  * @param float $s
  * @param float $res
  */
 public function testCalcs($p, $ds, $er, $s, $pp, $up, $m, $c)
 {
     $this->entity->setPurchase($p);
     $this->entity->setDiscountSupplier($ds);
     $this->entity->setExpenseRatio($er);
     $this->entity->setShipping($s);
     $this->assertEquals($pp, $this->entity->getPurchasePrice());
     $this->entity->setUnitPrice($up);
     $this->assertEquals($m, $this->entity->getMargin());
     $this->assertEquals($c, $this->entity->getCoef());
     $this->assertTrue($this->entity->isCoefPositive());
 }