MemoryTest.php

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<?php
namespace Magento\Test\Bootstrap;

class MemoryTest extends \PHPUnit\Framework\TestCase
{
    protected $_object;

    protected $_memoryLimit;

    protected $_activationPolicy;

    protected function setUp()
    {
        $this->_memoryLimit = $this->createPartialMock(\Magento\TestFramework\MemoryLimit::class, ['printStats']);
        $this->_activationPolicy = $this->createPartialMock(\stdClass::class, ['register_shutdown_function']);
        $this->_object = new \Magento\TestFramework\Bootstrap\Memory(
            $this->_memoryLimit,
            [$this->_activationPolicy, 'register_shutdown_function']
        );
    }

    protected function tearDown()
    {
        $this->_memoryLimit = null;
        $this->_activationPolicy = null;
        $this->_object = null;
    }

    public function testConstructorException()
    {
        new \Magento\TestFramework\Bootstrap\Memory($this->_memoryLimit, 'non_existing_callable');
    }

    public function testDisplayStats()
    {
        $eol = PHP_EOL;
        $this->expectOutputString("{$eol}=== Memory Usage System Stats ==={$eol}Dummy Statistics{$eol}");
        $this->_memoryLimit->expects(
            $this->once()
        )->method(
            'printStats'
        )->will(
            $this->returnValue('Dummy Statistics')
        );
        $this->_object->displayStats();
    }

    public function testActivateStatsDisplaying()
    {
        $this->_activationPolicy->expects(
            $this->once()
        )->method(
            'register_shutdown_function'
        )->with(
            $this->identicalTo([$this->_object, 'displayStats'])
        );
        $this->_object->activateStatsDisplaying();
    }

    public function testActivateLimitValidation()
    {
        $this->_activationPolicy->expects(
            $this->once()
        )->method(
            'register_shutdown_function'
        )->with(
            $this->identicalTo([$this->_memoryLimit, 'validateUsage'])
        );
        $this->_object->activateLimitValidation();
    }
}