Android - Robolectric - Unit testing setContentView

Normally the first thing we do in an Activity is to set the content view to a layout xml.
For example consider the below TestActivity, onCreate it sets its contentView to test_layout.xml

	public class TestActivity extends Activity {
	@Override
	public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.test_layout);
	}
	}

view raw TestActivity.java hosted with ❤ by GitHub

And the test_layout.xml is (Note : id of the root element android:id="@+id/test_layout_root")

	<?xml version="1.0" encoding="utf-8"?>
	<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:id="@+id/test_layout_root"
	android:layout_height="match_parent"
	android:layout_width="wrap_content"
	...
	...
	</TableLayout>

view raw TestLayout.xml hosted with ❤ by GitHub

In the robolectric test, we need to get the activity's content view id and assert it with the layout id

	@RunWith(RobolectricTestRunner.class)
	public class TestActivityTest {
	private TestActivity testActivity;
	@Before
	public void setup() {
	testActivity = new TestActivity();
	testActivity.onCreate(null);
	}
	@Test
	public void shouldSetTheTestLayoutOnCreate() {
	assertEquals(R.id.test_layout_root, shadowOf(testActivity).getContentView().getId());
	}
	}

view raw TestActivityTest.java hosted with ❤ by GitHub