RegistryTest.php

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

use \Magento\Framework\Registry;

class RegistryTest extends \PHPUnit\Framework\TestCase
{
    protected $registry;

    protected $data;

    protected function setUp()
    {
        $this->registry = new Registry();
        $this->data = [
            'key' => 'customer',
            'value' => \Magento\Customer\Model\Customer::class,
        ];
        $this->registry->register($this->data['key'], $this->data['value']);
    }

    public function tearDown()
    {
        unset($this->registry);
    }

    public function testRegistry()
    {
        $this->assertEquals($this->data['value'], $this->registry->registry($this->data['key']));
        $this->assertNull($this->registry->registry($this->data['value']));
    }

    public function testRegister()
    {
        $key = 'email';
        $value = '[email protected]';
        $this->registry->register($key, $value);
        $this->assertEquals($value, $this->registry->registry($key));
        $key = 'name';
        $graceful = true;
        $this->registry->register($key, $value, $graceful);
    }

    public function testRegisterKeyExists()
    {
        $this->registry->register($this->data['key'], $this->data['value']);
    }

    public function testUnregister()
    {
        $key = 'csv_adapter';
        $valueObj = $this->createMock(\Magento\ImportExport\Model\Export\Adapter\Csv::class);
        $this->registry->register($key, $valueObj);
        $this->assertEquals($valueObj, $this->registry->registry($key));
        $this->registry->unregister($key);
        $this->assertNull($this->registry->registry($key));
        $this->registry->unregister($this->data['key']);
        $this->assertNull($this->registry->registry($this->data['key']));
    }
}