MftfTestCase.php

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<?php
namespace tests\util;

use Magento\FunctionalTestingFramework\ObjectManager;
use Magento\FunctionalTestingFramework\Test\Handlers\TestObjectHandler;
use Magento\FunctionalTestingFramework\Util\TestGenerator;
use PHPUnit\Framework\TestCase;

abstract class MftfTestCase extends TestCase
{
    const RESOURCES_PATH = __DIR__ .
    DIRECTORY_SEPARATOR .
    '..' .
    DIRECTORY_SEPARATOR .
    'verification' .
    DIRECTORY_SEPARATOR .
    'Resources';

    public function generateAndCompareTest($testName)
    {
        $testObject = TestObjectHandler::getInstance()->getObject($testName);
        $test = TestGenerator::getInstance(null, [$testObject]);
        $test->createAllTestFiles();

        $cestFile = $test->getExportDir() .
            DIRECTORY_SEPARATOR .
            $testObject->getCodeceptionName() .
            ".php";

        $this->assertTrue(file_exists($cestFile));

        $this->assertFileEquals(
            self::RESOURCES_PATH . DIRECTORY_SEPARATOR . $testObject->getName() . ".txt",
            $cestFile
        );
    }

    public function validateSchemaErrorWithTest($fileContents, $objectType ,$expectedError)
    {
        $this->clearHandler();
        $fullTestModulePath = TESTS_MODULE_PATH .
            DIRECTORY_SEPARATOR .
            'TestModule' .
            DIRECTORY_SEPARATOR .
            $objectType .
            DIRECTORY_SEPARATOR;

        foreach ($fileContents as $fileName => $fileContent) {
            $tempFile = $fullTestModulePath . $fileName;
            $handle = fopen($tempFile, 'w') or die('Cannot open file:  ' . $tempFile);
            fwrite($handle, $fileContent);
            fclose($handle);
        }
        try {
            $this->expectExceptionMessage($expectedError);
            TestObjectHandler::getInstance()->getObject("someTest");
        } finally {
            foreach (array_keys($fileContents) as $fileName) {
                unlink($fullTestModulePath . $fileName);
            }
            $this->clearHandler();
        }
    }

    private function clearHandler()
    {
        // clear test object handler to force recollection of test data
        $property = new \ReflectionProperty(TestObjectHandler::class, 'testObjectHandler');
        $property->setAccessible(true);
        $property->setValue(null);

        // clear test object handler to force recollection of test data
        $property = new \ReflectionProperty(ObjectManager::class, 'instance');
        $property->setAccessible(true);
        $property->setValue(null);
    }
}