PHPUnit_Framework_Assert::assertObjectNotHasAttribute PHP Method

    public static function assertObjectNotHasAttribute($attributeName, $object, $message = '')
    {
        if (!is_string($attributeName)) {
            throw PHPUnit_Util_InvalidArgumentHelper::factory(1, 'string');
        }
        if (!preg_match('/[a-zA-Z_\\x7f-\\xff][a-zA-Z0-9_\\x7f-\\xff]*/', $attributeName)) {
            throw PHPUnit_Util_InvalidArgumentHelper::factory(1, 'valid attribute name');
        }
        if (!is_object($object)) {
            throw PHPUnit_Util_InvalidArgumentHelper::factory(2, 'object');
        }
        $constraint = new PHPUnit_Framework_Constraint_Not(new PHPUnit_Framework_Constraint_ObjectHasAttribute($attributeName));
        static::assertThat($object, $constraint, $message);
    }

 public function testCreate()
 {
     $directory = new FooDirectory($this->getMongoDB());
     $model = $directory->create(['memoryOnly' => 'yes']);
     PHPUnit::assertObjectNotHasAttribute('_id', $model);
     PHPUnit::assertEquals('yes', $model['memoryOnly']);
 }