public function testValidate() {
$v = $this->object->validate();
$this->assertEquals((bool)$v['ok'], false);
$this->assertEquals($v['errmsg'], 'ns not found');
$this->object->insert(array('a' => 'foo'));
$v = $this->object->validate();
$this->assertEquals((bool)$v['ok'], true);
$this->assertEquals($v['ns'], 'phpunit.c');
}