May 25, 2016

Notes: Selenium 3, the Spec, and Onwards by Simon Stewart

Title: Selenium 3, the Spec, and Onwards
Speaker: Simon Stewart, Selenium Project Lead
Host: Applitools
Date: Wed. May 25, 2016 @ 1:00 PM EDT
Duration: 60 minutes

Summing up Simon's Webinar:
  • Selenium 3 (no release date given) will be a removal of all old Selenium RC code into a legacy library called "leg-RC".
  • Selenium 4 will move closer to the new W3C WebDriver Protocol they have been pushing for.
  • Selenium 5 will be the full W3C WebDriver.

Before that information was given at the end of the talk, Simon took a long walk down Memory Lane...


How Selenium Started


Jason Huggins ( @hugs ) at the consulting company, ThoughtWorks, was in Tech Support working on a new web application to track time and expenses. Jason would fix one bug only to have it appear in another browser. He saw Ward Cunningham FIT (Framework for Integrated Test). Jason took this idea and realized that all browsers handled HTML differently, but all browsers used Javascript. Perhaps this could be leveraged?


Selenium Core was created. It could manipulate the DOM (Document Object Model), simulate clicks.

Tests, like with FIT, were was based on HTML tables. Selenium Remote Control (RC) was a good tool to start automating tests. He worked with Paul Hammant to add new functionality to it, where people could use the programming language of their choice.

Two years after Jason stated, Simon Stewart was using HTTPUnit for browser testing… and the web browser was rubbish (See the official home for HTTP Unit). HTTPUnit was in a gross violation of object oriented programming. Someone mentioned that people should put in wrappers around the functionality. He did this through six or seven iterations.

Simon borrowed the word WebDriver from another project. He wrote a fresh version, a “clean room” version of what he did before. At the time he though he would be done, back in 2007, and he thought he would be done in a year. Maybe two.

Jason and Simon met up when they both moved on to Google. At the time, AJAX was becoming popular. The problem was that you couldn’t just simulate a click. You had to emulate the mouse down and mouse up. As web application were becoming more sophisticated, it became harder to emulate what needed to be done.

Simon foolishly he said, wrote versions of WebDriver tightly coupled to the browser. Paul Hammant, Simon said, called him an idiot for doing this. The product became branded Selenium 2.0.

What is Selenium 3?


Simon once announced three years ago they would release the next version of Selenium WebDriver by Christmas... Luckily, Simon joked, he didn’t say what Christmas.

"What is in Selenium 3 and why are we bumping in a version number?"

Only the current Selenium WebDriver API will be there. All outdated Selenium Core code will be taken out.

With the Python and Ruby bindings, there will be practically be no changed. Java though… it will be breaking up into three separate libraries:

Selenium-Java:
  • Just the WebDriver classes. 

Selenium 3 Server: 
  •  Lightweight command line compatible remote server. 

leg-rc:
  • The old Selenium client-side classes.
  • WebDriverBackedSelenium.
  • Remote end point for SEL server. 

... As Simon said, “This is why the team doesn’t let me name things very often. I like a bad pun”.

If you are still using Selenium RC, there will be upgrade paths. New implementation of HTML table runner. All of this work is placed in for those who made a huge investment with Selenium RC.


W3C Spec:


From the World Wide Web Consortium's WebDriver Page:
https://www.w3.org/TR/webdriver/
"WebDriver is a remote control interface that enables introspection and control of user agents. It provides a platform- and language-neutral wire protocol as a way for out-of-process programs to remotely instruct the behaviour of web browsers.

"Provided is a set of interfaces to discover and manipulate DOM elements in web documents and to control the behaviour of a user agent. It is primarily intended to allow web authors to write tests that automate a user agent from a separate controlling process, but may also be used in such a way as to allow in-browser scripts to control a — possibly separate — browser".

"In conjunction with the browser venders, we have been working up a W3C spec for WebDriver". Opera, the browser company, suggested in the first Selenium conference to take the API and use that as a spec. At the time people were timid about adopting and using open source software. By having a W3C spec, each company could do a complete clean room implantation without using open source code.

Selenium 4: They will ship a variant of the web driver protocol for the W3C. Simon mentioned that the WebDriver project grew organically, so things aren't as organized as they would like. As they have been standardizing things, they have been making changes to the codebase.

Selnium 3.0 client should be able to talk to the 4.0 server. And Selenium 4.0 client should be able to talk to the 3.0 server. Selenium 5, though, will be just the W3C Standard, leaving just W3C WebDriver.

With the W3C Spec, browser vendors own the drivers. Responsibility for maintaining these switch from the open source enthusiasts currently working on the project, volunteering their time to the browser companies themselves.

Example Simon listed: Opera was able to add Presto.

ChromeDriver is a simple binary that knows how to start Chrome in a special mode.  

By allowing browser venders to own their own browser drivers, they are able to hook into the browser with more efficiency thhan the WebDriver could.

Becoming Mobile:


In the early days of WebDriver, the concept of the web on the mobile phone only started back with Steve Jobs and the iPhone.

Mobile devices have different limitations and different controls than on desktop. If you look at how modern mobile operating systems build their UI, it is much like HTML, telling how to traverse the tree structure. You can use the same tree style navigation that WebDriver uses in order to automate it.

Appium, IOS Driver (Facebook) all use the same API style to control mobile devices. They work the same on devices and simulators and emulators.

If you want to see what is being done, Simon talked about how we should check out gTECH, Google does some interesting talks to see what they have been doing.

W3C WebDriver Level 2. There are some things that are completely awful to automate, such as Coathangers: When an advanced functionality such as geolocation, drops down asking for permission to use your location. It would be very difficult to handle this with WebDriver. They are delaying adding this work.

Access to the Shadow DOM hasn’t been set up yet.

Other considerations: They are still trying to figure out: How do we integrate Siri, or other voice activated commands?

Simon hopes you are using WebDriver wrapped up in Page Objects, so you can swap out old Selenium RC methods, if you are still working on them.

He then reiterated:

Selenium WebDriver 3.0: Old Selenium RC code base removed and separated.
Selenium WebDriver 4.0: Start using the W3C WebDriver protocol.

Sidenote: This is the 100th post at Adventures in Automation! 

Happy Testing!

-T.J. Maher
Sr. QA Engineer,
Fitbit-Boston

// QA Engineer since Aug. 1996
// Automation developer for [ 1 ] year and still counting!
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