public function testProductSalableStatus()
 {
     $product = new Product();
     $product->setEnabled(false);
     $this->assertFalse($product->isSalable());
     $product->setEnabled(true);
     $this->assertTrue($product->isSalable());
     $product->setVariations(new ArrayCollection(array(new Product())));
     $this->assertFalse($product->isSalable());
 }