/**
* Test getMediaEmptyGalleryDataJson()
*/
public function testGetMediaEmptyGalleryDataJson()
{
$mediaGalleryData = [];
$this->coreRegistry->expects($this->any())->method('registry')->willReturn($this->productModelMock);
$typeInstance = $this->getMock('\\Magento\\Catalog\\Model\\Product\\Type\\AbstractType', [], [], '', false);
$typeInstance->expects($this->any())->method('getStoreFilter')->willReturn('_cache_instance_store_filter');
$this->productModelMock->expects($this->any())->method('getTypeInstance')->willReturn($typeInstance);
$this->productModelMock->expects($this->any())->method('getMediaGalleryImages')->willReturn($mediaGalleryData);
$this->gallery->getMediaGalleryDataJson();
}