ConstantTest.php

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<?php
namespace Magento\Framework\Data\Test\Unit\Argument\Interpreter;

use \Magento\Framework\Data\Argument\Interpreter\Constant;

class ConstantTest extends \PHPUnit\Framework\TestCase
{
    private $object;

    protected function setUp()
    {
        $this->object = new Constant();
    }

    public function testEvaluate()
    {
        // it is defined in framework/bootstrap.php
        $this->assertEquals(TESTS_TEMP_DIR, $this->object->evaluate(['value' => 'TESTS_TEMP_DIR']));
    }

    public function testEvaluateBadValue($value)
    {
        $this->object->evaluate($value);
    }

    public function evaluateBadValueDataProvider()
    {
        return [
            [['value' => 'KNOWINGLY_UNDEFINED_CONSTANT']],
            [['value' => '']],
            [[]]
        ];
    }
}