public function testRemover()
 {
     $e = new ComplexColumnTypeEntity2();
     $e->removeTag('foo');
     $this->assertEquals(array(), $e->getTags());
     $e->setTags(array('foo', 1234));
     $e->removeTag('foo');
     $this->assertEquals(array(1234), $e->getTags());
     $e->removeTag(1234);
     $this->assertEquals(array(), $e->getTags());
     $e->setTags(array(12, 34, 1234));
     $e->removeTag('foo');
     $this->assertEquals(array(12, 34, 1234), $e->getTags());
     $e->removeTag('1234');
     $this->assertEquals(array(12, 34), $e->getTags());
 }