public function testUnitPrices()
 {
     $price = $this->getMock('JLM\\ProductBundle\\Model\\ProductPriceInterface');
     $this->assertCount(0, $this->entity->getUnitPrices());
     $this->assertFalse($this->entity->removeUnitPrice($price));
     $this->assertCount(0, $this->entity->getUnitPrices());
     $this->assertTrue($this->entity->addUnitPrice($price));
     $this->assertCount(1, $this->entity->getUnitPrices());
     $this->assertTrue($this->entity->removeUnitPrice($price));
     $this->assertCount(0, $this->entity->getUnitPrices());
 }