public function testCommonMethods()
 {
     $instance = new FilterCondition('filter');
     $this->assertInternalType('string', $instance->getCondition());
     $this->assertInternalType('array', $instance->namespaces);
     $this->assertInternalType('string', $instance->getWeakConditionString());
     $this->assertInternalType('boolean', $instance->isSafe());
 }