1
00:00:00,000 --> 00:00:04,591
[MUSIC]

2
00:00:04,591 --> 00:00:08,770
Hey everyone, I'm Guil, and
this is JavaScript Unit Testing Basics.

3
00:00:08,770 --> 00:00:13,250
The material in this course assumes you
know your way around JavaScript objects,

4
00:00:13,250 --> 00:00:14,890
node, and mpm.

5
00:00:14,890 --> 00:00:17,300
So make sure you complete
all the prerequisites for

6
00:00:17,300 --> 00:00:18,730
this course before continuing.

7
00:00:18,730 --> 00:00:23,133
And if you wanna brush up on some of
those videos, I've included the links and

8
00:00:23,133 --> 00:00:24,911
the teacher's notes as well.

9
00:00:24,911 --> 00:00:29,105
In this course, you'll practice
a way to write JavaScript called,

10
00:00:29,105 --> 00:00:31,431
Behavior Driven Development or BDD.

11
00:00:31,431 --> 00:00:35,190
In BDD we write special functions,
called tests, for

12
00:00:35,190 --> 00:00:39,645
our application before we
actually write any real code.

13
00:00:39,645 --> 00:00:42,395
These tests describe
how a code should work.

14
00:00:42,395 --> 00:00:47,677
In other words, tests describe
the expected behavior of our application.

15
00:00:47,677 --> 00:00:51,087
Having these tests written already
will help us understand the code we

16
00:00:51,087 --> 00:00:52,077
want to write.

17
00:00:52,077 --> 00:00:55,327
Like an outline,
as we continue writing our code

18
00:00:55,327 --> 00:01:00,062
our tests will let us know as soon as our
programs behave the way we want them to.

19
00:01:00,062 --> 00:01:02,627
They'll also tell us when we've
accidentally broken something

20
00:01:02,627 --> 00:01:04,140
along the way.

21
00:01:04,140 --> 00:01:08,660
We'll build up our tests to cover one
small unit of our code at a time.

22
00:01:08,660 --> 00:01:11,660
This style of testing
is called unit testing.

23
00:01:11,660 --> 00:01:13,930
Since unit tests focus on small,

24
00:01:13,930 --> 00:01:18,940
meaningful chunks of functionality,
good unit tests are easy to understand.

25
00:01:18,940 --> 00:01:21,680
They prove that each piece of
our code does what we want.

26
00:01:22,800 --> 00:01:23,520
In the next video,

27
00:01:23,520 --> 00:01:26,560
I'll cover some of the ways unit
testing makes development easier.