Unit testing is taking a piece of code and testing it independently without any other dependencies or parts of the system running (for example the database).
Robolectric is a unit test framework that de-fangs the Android SDK jar so you can test-drive the development of your Android app. Tests run inside the JVM on your workstation in seconds.
Combing them both allows you to run fast tests on the JVN still using the Android API's.
@RunWith(RobolectricTestRunner.class)
public class MyActivityTest {
@Test
public void clickingButton_shouldChangeResultsViewText() throws Exception {
MyActivity activity = Robolectric.setupActivity(MyActivity.class);
Button button = (Button) activity.findViewById(R.id.button);
TextView results = (TextView) activity.findViewById(R.id.results);
button.performClick();
assertThat(results.getText().toString()).isEqualTo("Robolectric Rocks!");
}
}
To configure robolectric add @Config annotation to test class or method.
@RunWith(RobolectricTestRunner.class)
@Config(application = MyApplication.class)
public final class MyTest {
}
@RunWith(RobolectricTestRunner.class)
@Config(sdk = Build.VERSION_CODES.LOLLIPOP)
public final class MyTest {
}
AndroidManifest.xml
Resources and assets will be loaded relative to the manifest.
@RunWith(RobolectricTestRunner.class)
@Config(manifest = "path/AndroidManifest.xml")
public final class MyTest {
}
@RunWith(RobolectricTestRunner.class)
public final class MyTest {
@Config(qualifiers = "sw600dp")
public void testForTablet() {
}
}