read() public method

Read the session data from Cloud Datastore.
public read ( $id )
 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);
 }