ExcelTest.php

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<?php
namespace Magento\Framework\Convert\Test\Unit;

class ExcelTest extends \PHPUnit\Framework\TestCase
{
    private $_testData = [
        [
            'ID', 'Name', 'Email', 'Group', 'Telephone', '+Telephone', 'ZIP', '0ZIP', 'Country', 'State/Province',
            'Symbol=', 'Symbol-', 'Symbol+'
        ],
        [
            1, 'Jon Doe', '[email protected]', 'General', '310-111-1111', '+310-111-1111', 90232, '090232',
            'United States', 'California', '=', '-', '+'
        ],
    ];

    protected $_testHeader = [
        'HeaderID', 'HeaderName', 'HeaderEmail', 'HeaderGroup', 'HeaderPhone', 'Header+Phone', 'HeaderZIP',
        'Header0ZIP', 'HeaderCountry', 'HeaderRegion', 'HeaderSymbol=', 'HeaderSymbol-', 'HeaderSymbol+'
    ];

    protected $_testFooter = [
        'FooterID', 'FooterName', 'FooterEmail', 'FooterGroup', 'FooterPhone', 'Footer+Phone', 'FooterZIP',
        'Footer0ZIP', 'FooterCountry', 'FooterRegion', 'FooterSymbol=', 'FooterSymbol-', 'FooterSymbol+'
    ];

    protected function _getSampleOutputFile()
    {
        return __DIR__ . '/_files/sample.xml';
    }

    public function callbackMethod($row)
    {
        $data = [];
        foreach ($row as $value) {
            $data[] = $value . '_TRUE_';
        }
        return $data;
    }

    public function testConvert()
    {
        $convert = new \Magento\Framework\Convert\Excel(new \ArrayIterator($this->_testData));
        $convert->setDataHeader($this->_testHeader);
        $convert->setDataFooter($this->_testFooter);
        $this->assertXmlStringEqualsXmlString(
            file_get_contents($this->_getSampleOutputFile()),
            $convert->convert()
        );
    }

    public function testConvertCallback()
    {
        $convert = new \Magento\Framework\Convert\Excel(
            new \ArrayIterator($this->_testData),
            [$this, 'callbackMethod']
        );
        $this->assertContains('_TRUE_', $convert->convert(), 'Failed asserting that callback method is called.');
    }

    protected function _writeFile($callback = false)
    {
        $name = md5(microtime());
        $file = TESTS_TEMP_DIR . '/' . $name . '.xml';

        $stream = new \Magento\Framework\Filesystem\File\Write(
            $file,
            new \Magento\Framework\Filesystem\Driver\File(),
            'w+'
        );
        $stream->lock();

        if (!$callback) {
            $convert = new \Magento\Framework\Convert\Excel(new \ArrayIterator($this->_testData));
            $convert->setDataHeader($this->_testHeader);
            $convert->setDataFooter($this->_testFooter);
        } else {
            $convert = new \Magento\Framework\Convert\Excel(
                new \ArrayIterator($this->_testData),
                [$this, 'callbackMethod']
            );
        }

        $convert->write($stream);
        $stream->unlock();
        $stream->close();

        return $file;
    }

    public function testWrite()
    {
        $file = $this->_writeFile();
        $this->assertXmlStringEqualsXmlString(
            file_get_contents($this->_getSampleOutputFile()),
            file_get_contents($file)
        );
    }

    public function testWriteCallback()
    {
        $file = $this->_writeFile(true);
        $this->assertContains('_TRUE_', file_get_contents($file), 'Failed asserting that callback method is called.');
    }
}