CsvTest.php

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

use Magento\Framework\Filesystem\Driver\File;

class CsvTest extends \PHPUnit\Framework\TestCase
{
    protected $_model;

    protected function setUp()
    {
        $this->_model = new \Magento\Framework\File\Csv(new File());
    }

    protected function tearDown()
    {
        unset($this->_model);
    }

    public function testSetLineLength()
    {
        $expected = 4;
        $this->_model->setLineLength($expected);
        $lineLengthProperty = new \ReflectionProperty(\Magento\Framework\File\Csv::class, '_lineLength');
        $lineLengthProperty->setAccessible(true);
        $actual = $lineLengthProperty->getValue($this->_model);
        $this->assertEquals($expected, $actual);
    }

    public function testSetDelimiter()
    {
        $this->assertInstanceOf(\Magento\Framework\File\Csv::class, $this->_model->setDelimiter(','));
    }

    public function testSetEnclosure()
    {
        $this->assertInstanceOf(\Magento\Framework\File\Csv::class, $this->_model->setEnclosure('"'));
    }

    public function testGetDataFileNonExistent()
    {
        $file = 'FileNameThatShouldNotExist';
        $this->_model->getData($file);
    }
}