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In this video we'll start testing our project with Robolectric!
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We've added a dependency, changed our test
runner, and set up the configuration.
0:00
So without further ado,
let's get back to testing.
0:05
Unlike Mockito,
Robolectric doesn't require us to
0:09
use the view presenter model
that we've been using.
0:12
With Robolectric,
0:15
we can just test the activity directly,
hence, MainActivityTest.
0:16
Let's start by uncommenting
the setUp method and
0:22
deleting everything except activity =.
0:28
Then let's set it equal to
Robolectric.setupActivity and
0:33
pass in MainActivity.class for
0:41
the parameter, and that's it.
0:44
Thanks to Robolectric,
our activity now exists and
0:49
has gone through the onCreate,
onStart and onResume life cycle methods.
0:52
Moving on to the editTextUpdatesTextView
test, let's start and
0:59
finish by uncommenting it.
1:03
That button works better for that.
1:11
Then let's run our tests again and,
1:13
yikes, what's this all about?
1:17
Well, it turns out that currently
the snapshot build isn't quite ready for
1:27
Marshmallow.
1:32
So let's add back in the Config SDK
1:34
parameter to run on Lollipop instead,
1:38
comma sdk = Build.VERSION_CODES.LOLLIPOP.
1:43
We'll keep using this snapshot build,
though.
1:49
It fixes a couple of bugs we would
otherwise run into down the road.
1:52
Then let's try running
our tests one more time.
1:57
And success!
2:05
But wait,
how do we know this is really working?
2:07
Let's comment out the Act line and
run it again.
2:10
Just like we would expect, the test now
fails because we didn't change the text.
2:22
It still has the default value
of textView set in the layout.
2:28
All right, let's uncomment out
the Act line and run it again.
2:32
This is what makes Robolectric so
powerful.
2:40
We can write our tests as if our app is
actually running, even though it's not.
2:43
It just seems that way,
thanks to Robolectric.
2:48
Now that we've got our editText tested,
let's move on to our spinner.
2:52
Let's create a new @Test method.
2:58
Public void, and let's name it
spinnerUpdatesBackgroundColor.
3:07
Which throws an exception.
3:17
Then let's copy and
paste in the Arrange, Act,
3:22
Assert comments from
the teacher's notes below.
3:24
Cool, starting with the Arrange section,
3:34
it will be exactly the same as it
is in MainActivity presenter test.
3:36
So let's just copy and paste it in.
3:41
Moving on to the Act section, we need to
select the right item from our spinner.
3:56
Let's type activity.colorSpinner
to get our spinner object,
4:01
then let's call the setSelection
method and pass in our index.
4:07
Now we just need to assert
that the background color is
4:17
equal to our given color.
4:20
But before we get to
the Assert statement itself,
4:22
let's create a variable to
hold the background color,
4:27
int expectedColor and
let's set it equal to
4:32
activity.LinearLayout.getBackground to
get the background.
4:36
Then if we open up the quick
documentation with Ctrl + J on Mac or
4:43
Ctrl + Q on Windows,
4:48
we can see that the getBackground
method will return a Drawable.
4:50
But in our case,
we can be a little more specific.
4:57
Since our background is
just one solid color,
5:00
instead of Android using
the regular Drawable class,
5:04
it uses a specialized version of
the Drawable class named ColorDrawable.
5:07
Let's cast this object to
a ColorDrawable object, ColorDrawable,
5:14
and then add parenthesis around
the whole right side of our statement.
5:19
Then let's call getColor on our
newly cast ColorDrawable object.
5:29
And there we go.
5:35
We retrieved the background
color from our linear layout and
5:37
stored it in this expectedColor variable.
5:40
To finish up,
5:43
we just need to assert that the given
color matches the expected color.
5:44
AssertEquals givenColor, expectedColor.
5:54
All right,
now let's comment out the Act section
6:00
And then right-click inside our test
method and select Run to run the test.
6:07
And now that we've seen the test fail,
let's bring back the Act section and,
6:16
hopefully, we'll see the test pass.
6:20
Nice, with our spinner test out of the
way, all that's left is testing that our
6:30
Launch Activity button successfully
launches our other activity,
6:34
which we'll get to in the next video.
6:38
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