Magneto 2 Integration Testing and Configration

Required Configuration for integration testing

All Magento integration test code can be found in
dev/tests
├── integration
            ├──etc
                 ├──install-config-mysql.php.dist
            ├──phpunit.xml

Step1:

/dev/tests/integration/etc/install-config-mysql.php.dist. Copy this file to /dev/tests/integration/etc/install-config-mysql.php

database credentials in the above file. Use different database name because in integration testingall database is rest.

Copy this file dev/tests/integration/phpunit.xml.dist to dev/tests/integration/phpunit.xml

       
<testsuite name="Magento Integration Tests">
  <directory suffix="Test.php">testsuite</directory>
  <exclude>testsuite/Magento/MemoryUsageTest.php</exclude>
</testsuite>

Replace to

 
 <testsuite name="Namespace Modulename">
  <directory suffix="Test.php">../../../app/code/*/*/Test/Integration</directory>
  <exclude>testsuite/Magento/MemoryUsageTest.php</exclude>
 </testsuite>
 

Step2:
And Create file inside BaseConfigTest.php  NameSpace\module\Test\Integration

 
namespace NameSpace\module\Test\Integration;
use Magento\Framework\App\DeploymentConfig;
use Magento\Framework\App\DeploymentConfig\Reader as DeploymentConfigReader;
use Magento\Framework\Component\ComponentRegistrar;
use Magento\Framework\App\Filesystem\DirectoryList;
use Magento\Framework\Module\ModuleList;
use Magento\TestFramework\ObjectManager;
class BaseConfigTest extends \PHPUnit\Framework\TestCase
{
    private $moduleName = 'Namespace_ModuleName';
    private $objectManager;
    public function testTheModuleIsRegistered()
    {
        $registrar = new ComponentRegistrar();
        $path = $registrar->getPaths(ComponentRegistrar::MODULE);
        $this->assertArrayHasKey($this->moduleName, $path);
    }
    protected function setUp()
    {
        $this->objectManager = ObjectManager::getInstance();
    }
}

Now go to Project root folder and run command
../../../vendor/bin/phpunit --testsuite "Namespace Modulename"
Or
../../../vendor/phpunit/phpunit/phpunit --testsuite "Namespace Modulename"

If TESTS_CLEANUP is enabled then it reset database if it is disabled then it run from existing state