ArrayFilterTest.php

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

use \Magento\Framework\Filter\ArrayFilter;

class ArrayFilterTest extends \PHPUnit\Framework\TestCase
{
    public function testFilter()
    {
        $arrayFilter = new ArrayFilter();

        $filterMock = $this->createMock(\Zend_Filter_Interface::class);
        $filterMock->expects($this->exactly(3))->method('filter')->will(
            $this->returnCallback(
                function ($input) {
                    return '(' . $input . ')';
                }
            )
        );
        $arrayFilter->addFilter($filterMock);

        $fieldFilterMock = $this->createMock(\Zend_Filter_Interface::class);
        $fieldFilterMock->expects($this->exactly(1))->method('filter')->will(
            $this->returnCallback(
                function ($input) {
                    return '[' . $input . ']';
                }
            )
        );
        $arrayFilter->addFilter($fieldFilterMock, 'field2');

        $inputArray = ['field1' => 'value1', 'field2' => 'value2', 'field3' => 'value3'];
        $expectedOutput = ['field1' => '(value1)', 'field2' => '[(value2)]', 'field3' => '(value3)'];
        $this->assertEquals($expectedOutput, $arrayFilter->filter($inputArray), 'Array was filtered incorrectly.');
    }
}