NumberTest.php

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

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

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

    protected function setUp()
    {
        $this->_model = new Number();
    }

    public function testEvaluateException($input)
    {
        $this->_model->evaluate($input);
    }

    public function evaluateExceptionDataProvider()
    {
        return ['no value' => [[]], 'non-numeric value' => [['value' => 'non-numeric']]];
    }

    public function testEvaluate($input, $expected)
    {
        $actual = $this->_model->evaluate(['value' => $input]);
        $this->assertSame($expected, $actual);
    }

    public function evaluateDataProvider()
    {
        return [
            'integer' => [10, 10],
            'float' => [10.5, 10.5],
            'string numeric (integer)' => ['10', '10'],
            'string numeric (float)' => ['10.5', '10.5']
        ];
    }
}