TestCasePropertiesTest.php

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<?php
namespace Magento\Test\Workaround\Cleanup;

class TestCasePropertiesTest extends \PHPUnit\Framework\TestCase
{
    protected $_fixtureProperties = [
        ['name' => 'testPublic', 'is_static' => false],
        ['name' => '_testPrivate', 'is_static' => false],
        ['name' => '_testPropertyBoolean', 'is_static' => false],
        ['name' => '_testPropertyInteger', 'is_static' => false],
        ['name' => '_testPropertyFloat', 'is_static' => false],
        ['name' => '_testPropertyString', 'is_static' => false],
        ['name' => '_testPropertyArray', 'is_static' => false],
        ['name' => '_testPropertyObject', 'is_static' => false],
        ['name' => 'testPublicStatic', 'is_static' => true],
        ['name' => '_testProtectedStatic', 'is_static' => true],
        ['name' => '_testPrivateStatic', 'is_static' => true],
    ];

    public function testEndTestSuiteDestruct()
    {
        $phpUnitTestSuite = new \PHPUnit\Framework\TestSuite();
        $phpUnitTestSuite->addTestFile(__DIR__ . '/TestCasePropertiesTest/DummyTestCase.php');
        // Because addTestFile() adds classes from file to tests array, use first testsuite
        $testSuite = $phpUnitTestSuite->testAt(0);
        $testSuite->run();
        $testClass = $testSuite->testAt(0);

        $propertyObjectMock = $this->createPartialMock(\stdClass::class, ['__destruct']);
        $propertyObjectMock->expects($this->atLeastOnce())->method('__destruct');
        $testClass->setPropertyObject($propertyObjectMock);

        foreach ($this->_fixtureProperties as $property) {
            if ($property['is_static']) {
                $this->assertAttributeNotEmpty($property['name'], get_class($testClass));
            } else {
                $this->assertAttributeNotEmpty($property['name'], $testClass);
            }
        }

        $clearProperties = new \Magento\TestFramework\Workaround\Cleanup\TestCaseProperties();
        $clearProperties->endTestSuite($testSuite);

        foreach ($this->_fixtureProperties as $property) {
            if ($property['is_static']) {
                $this->assertAttributeEmpty($property['name'], get_class($testClass));
            } else {
                $this->assertAttributeEmpty($property['name'], $testClass);
            }
        }
    }
}