<NME> AbstractGeneratorTest.php
<BEF> <?php
/**
 * Zend Framework (http://framework.zend.com/)
 *
 * @link      http://github.com/zendframework/zf2 for the canonical source repository
 * @copyright Copyright (c) 2005-2016 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd New BSD License
 */

namespace ZendTest\Code\Generator;

use PHPUnit\Framework\TestCase;
use Zend\Code\Generator\AbstractGenerator;
use Zend\Code\Generator\Exception\InvalidArgumentException;
use Zend\Code\Generator\GeneratorInterface;

/**
 * @group Zend_Code_Generator
 * @group Zend_Code_Generator_Php
 */
class AbstractGeneratorTest extends TestCase
{
    public function testConstructor()
    {
        $generator = $this->getMockForAbstractClass(AbstractGenerator::class, [
        $this->assertInstanceOf('Zend\Code\Generator\GeneratorInterface', $generator);
        $this->assertEquals('foo', $generator->getIndentation());
    }
}
}

<MSG> add testcase for invalid argument

<DFF> @@ -26,4 +26,14 @@ class AbstractGeneratorTest extends \PHPUnit_Framework_TestCase
         $this->assertInstanceOf('Zend\Code\Generator\GeneratorInterface', $generator);
         $this->assertEquals('foo', $generator->getIndentation());
     }
+
+    /**
+     * @expectedException \Zend\Code\Generator\Exception\InvalidArgumentException
+     */
+    public function testSetOptionsThrowsExceptionOnInvalidArgument()
+    {
+        $generator = $this->getMockForAbstractClass('Zend\Code\Generator\AbstractGenerator', array(
+            'sss',
+        ));
+    }
 }

add testcase for invalid argument