public function testVariations()
{
$product = new Product();
$this->assertFalse($product->hasVariations(), 'there should not be any variations when initialized');
$this->assertEmpty($product->getVariations(), 'there should not be any variations when initialized');
$product->setPrice(3);
$variation = $product->useVariation('variant1')->setPrice(4);
$this->assertSame($product, $variation->getParent(), 'the original Product class should be the variation parent');
$product->useVariation('variant2')->setPrice(7);
$this->assertSame(3, $product->getPrice());
$this->assertSame(4, $product->useVariation('variant1')->getPrice());
$this->assertSame(7, $product->useVariation('variant2')->getPrice());
$this->assertTrue($product->hasVariations());
$variations = $product->getVariations();
$this->assertCount(2, $variations);
$this->assertInstanceof('Vespolina\\Entity\\Product\\Product', $variations['variant1']);
// next goal is to be able to select a product variation and add it to the cart
}
