public function testReadEntity()
{
$key = new Key('projectid');
$key->pathElement(self::KIND, 'sessionid');
$entity = new Entity($key, ['data' => 'sessiondata']);
$this->transaction->lookup($key)->shouldBeCalledTimes(1)->willReturn($entity);
$this->datastore->transaction()->shouldBeCalledTimes(1)->willReturn($this->transaction->reveal());
$this->datastore->key(self::KIND, 'sessionid', ['namespaceId' => self::NAMESPACE_ID])->shouldBeCalledTimes(1)->willReturn($key);
$datastoreSessionHandler = new DatastoreSessionHandler($this->datastore->reveal());
$datastoreSessionHandler->open(self::NAMESPACE_ID, self::KIND);
$ret = $datastoreSessionHandler->read('sessionid');
$this->assertEquals('sessiondata', $ret);
}