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[MUSIC]

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Hi, I'm Craig, and I'm a developer.

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In this course,

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we're gonna explore the wonderful
world of a web browser automation.

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If you don't know what that means yet,
you're in the right place.

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We'll start from the very beginning and
work our way into a hands-on

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specific use case using a powerful
automation framework known as Selenium.

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But before we get started,
let's take a minute for

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you to get familiar with
your learning environment.

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First, there are speed controls
in the video player, so

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you can feel free to slow me down or
speed me up and I won't mind at all.

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Attached to each video,
there are teacher's notes.

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We'll use this space to share
additional information with you.

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Now, I'll do my best to let you know when
I've added some information on there.

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But, trying to get in a habit of
checking the notes on each video.

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There are lots of great
resources tucked away in there.

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And finally, don't forget,
you aren't alone.

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Many other students
are taking this course and

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might be wondering the same
thing that you are.

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Make sure you check out
the community forum and

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ask a question when you have one.

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The Treehouse community is very welcoming.

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Now in order to make this course as
accessible as possible, Nate and

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I have decided to use the JavaScript
programming language to explore Selenium.

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Now if JavaScript isn't your
primary language, don't fret.

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We'll take it slow and

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I'll also include links where you
can pick up more JavaScript skills.

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There are a few prerequisites for
this course, so please check those

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just to make sure you're up to date
on what we'll be discussing here.

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Software development is a process,
and it has a lifecycle.

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Writing code is only one part of that.

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In order to successfully
release software to users,

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it really ought to be thoroughly tested.

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Now, this helps not only to ensure that
it is working as it is intended, but

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also helps your users
avoid unnecessary errors.

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Users really don't like bugs.

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So, how can you make sure that
they don't encounter bugs?

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Well, the answer is
pretty straightforward.

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You check before they see it and you
make sure that there aren't any errors.

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This is known as testing.

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Imagine for a second that you
have a web-based application and

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there are a few pages with
just a couple of flaws.

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Now, this might seem like you could
just click through each page and

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try all the different possibilities.

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So when you're done with all that clicking
around you realize, wait a second,

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not everybody uses Google Chrome and
that's the only place I tested it.

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I better try Safari.

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Okay, now I found some more issues.

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I guess I better try Firefox and
then Internet Explorer.

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And then wait,
what about phones and tablets and

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what about all those different versions of
those browsers that everybody's updated?

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Wait, people use different
operating systems.

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How could you possibly go about testing
all those different scenarios, that's so

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much testing.

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In the teacher's notes, we have included
a browser compatibility test matrix

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that also takes screen
resolution into account.

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It turns out that this type of manual
testing requires a team of a dozen or

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more people to fully test even
a simple product that has to support

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all these permutations.

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Now, testing of this nature is dull,
repetitive, and tedious.

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It can lead to testers burning out and
making accidental mistakes.

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This type of manual testing does exist,
and it is known to not

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only delay product launches, but
also slow new product feature creation.

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Because all the new features
are just another thing to test.

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But, but, but you say wisely,
there's tons of apps that I use daily, and

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they don't have any bugs.

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They seem to have new
features all the time.

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How do they do it?

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That's a great question and
I'm glad you asked.

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The answer there is automation.

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You can actually write code that
will go into all that clicking and

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filling out a form fields and all
the permutations and have it report back.

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Computers don't get
bored by tedious tasks.

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I think that you'll see writing
automation code is actually pretty fun.

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It's a win-win.

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Yeah, and you can use this automation
code in your testing framework so

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your app can be fully tested
in all those permutations.

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That's yet another win.

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So are you ready to start winning?

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There are a bunch of automation tools, but
Selenium is definitely one of the most

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popular ones out there and
it has been around for a long time.

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Let's take a look at it and
its history right after this quick break.