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In this video we finish up by UI testing our Button!
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We've just finished testing our edit
text and our spinner using Espresso.
0:00
All that remains is testing that our
button launches our other activity, but
0:04
I'm pretty sure that won't
be left remaining for
0:08
long this time instead of checking
something about the intent.
0:11
Let's check something specific
about our other activity.
0:15
If we open up activity_other.xml.
0:20
It looks like we should be able to
match on this other activity text.
0:27
And if we do find a match with this text,
0:33
it means that this
TextView is on the screen.
0:36
Which means our Other Activity
has successfully launched.
0:39
So for this test, all we're going
to do is click on the button and
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then check that there exists a view
with text equal to Other Activity.
0:47
Starting with the Arrange section,
0:56
let's create a string variable to
store the text, we'd like to find.
0:58
String otherActivityString
= "Other Activity".
1:04
Next in the Act section,
1:12
let's click our button,
1:16
onView(withID(R.id.launchActivityButton))
then
1:20
.perform and click.
1:29
Finally in the Assert section,
1:33
let's get our view with text
equal to otherActivityString.
1:35
So onView(withText(otherActivityString)),
1:40
then let's check that this
matches a not null value.
1:48
And that's it.
2:02
Let's run our test and see if it works.
2:03
Nice.
2:16
Now let's comment out the Act section and
make sure it fails.
2:17
And we get a NoMatchingViewException.
2:36
Perfect, no views in hierarchy found
matching: with text: is "Other Activity".
2:39
Now let's bring back the Act section and
take a couple of victory laps.
2:47
Nice.
3:00
Well you go.
3:01
One more, one more.
3:04
Six seconds later and I've already watched
my app get automatically tested twice.
3:10
Using tests and following test
driven design isn't always easy,
3:16
especially in the world of Android.
3:20
But now that you're familiar with Mocito,
Roboletric, and
3:23
Espresso, you've got the power to
test anything your heart desires.
3:26
Unit testing with no Android framework?
3:31
Try Mocito.
3:33
If you need the framework
give Robolectric a shot,
3:34
and if you want to run a test on an actual
device, well, Espresso's got you covered.
3:37
Maybe now would be a good time to look
back at some of your earlier projects.
3:43
I'm sure they could use some testing.
3:47
Until next time.
3:48
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