createMock(\Magento\Framework\Cache\FrontendInterface::class); $lowLevelFrontend = $this->createMock(\Zend_Cache_Core::class); /** @var \Magento\Framework\App\CacheInterface|\PHPUnit_Framework_MockObject_MockObject $appCache */ $appCache = $this->createMock(\Magento\Framework\App\CacheInterface::class); $frontendCache->expects($this->once())->method('getLowLevelFrontend')->willReturn($lowLevelFrontend); $appCache->expects($this->once()) ->method('getFrontend') ->willReturn($frontendCache); // Create new currency object $currency = new Currency($appCache, null, 'en_US'); $this->assertEquals($lowLevelFrontend, $currency->getCache()); $this->assertEquals('USD', $currency->getShortName()); } }