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Testing in Android

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Testing with Robolectric

6:41 with Ben Deitch

In this video we'll start testing our project with Robolectric!

Arrange - Act - Assert Comments

        // Arrange


        // Act


        // Assert

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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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