/**
     * @covers \Magento\Sales\Controller\Adminhtml\Order\Creditmemo\PrintAction::executeInternal
     */
    public function testExecute()
    {
        $creditmemoId = 2;
        $date = '2015-01-19_13-03-45';
        $fileName = 'creditmemo2015-01-19_13-03-45.pdf';
        $fileContents = 'pdf0123456789';
        $this->prepareTestExecute($creditmemoId);

        $this->objectManagerMock->expects($this->any())
            ->method('create')
            ->willReturnMap(
                [
                    ['Magento\Sales\Model\Order\Creditmemo', [], $this->creditmemoMock],
                    ['Magento\Sales\Model\Order\Pdf\Creditmemo', [], $this->creditmemoPdfMock]
                ]
            );
        $this->creditmemoRepositoryMock->expects($this->once())
            ->method('get')
            ->with($creditmemoId)
            ->willReturn($this->creditmemoMock);
        $this->creditmemoPdfMock->expects($this->once())
            ->method('getPdf')
            ->with([$this->creditmemoMock])
            ->willReturn($this->pdfMock);
        $this->objectManagerMock->expects($this->once())
            ->method('get')
            ->with('Magento\Framework\Stdlib\DateTime\DateTime')
            ->willReturn($this->dateTimeMock);
        $this->dateTimeMock->expects($this->once())
            ->method('date')
            ->with('Y-m-d_H-i-s')
            ->willReturn($date);
        $this->pdfMock->expects($this->once())
            ->method('render')
            ->willReturn($fileContents);
        $this->fileFactoryMock->expects($this->once())
            ->method('create')
            ->with(
                $fileName,
                $fileContents,
                \Magento\Framework\App\Filesystem\DirectoryList::VAR_DIR,
                'application/pdf'
            )
            ->willReturn($this->responseMock);

        $this->assertInstanceOf(
            'Magento\Framework\App\ResponseInterface',
            $this->printAction->executeInternal()
        );
    }