public function testGetProductThumbnail() { $productForThumbnail = $this->_initProduct(); /** Ensure that image helper was initialized with correct arguments */ $this->_imageHelper->expects($this->once())->method('init')->with($productForThumbnail, 'thumbnail')->will($this->returnSelf()); $productThumbnail = $this->_renderer->getProductThumbnail(); $this->assertSame($this->_imageHelper, $productThumbnail, 'Invalid product thumbnail is returned.'); }