Play with how Robolectric works concerned with shadows has type from higher API running in lower sdk
I intentionally used super low compileSdk, targetSdk
android {
namespace = "com.example.testlocationmanager3"
compileSdk = 22 # intentional super low compile sdk
defaultConfig {
applicationId = "com.example.testlocationmanager3"
minSdk = 21
targetSdk = 22 # intentional super low target sdk
versionCode = 1
versionName = "1.0"
}
...
}
public class MainActivity extends android.app.Activity {
LocationManager locationManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
}
}@RunWith(RobolectricTestRunner.class)
public class MainActivityTest {
@Test
public void startup() {
System.out.println("here packageName = " + RuntimeEnvironment.application.getPackageName());
System.out.println("here apiLevel = " + RuntimeEnvironment.getApiLevel()); // output is "21"
MainActivity activity = Robolectric.setupActivity(MainActivity.class);
assertNotNull(activity.locationManager);
}
@Config(sdk = {22})
@Test
public void startup_config22() {
System.out.println("here packageName = " + RuntimeEnvironment.application.getPackageName());
System.out.println("here apiLevel = " + RuntimeEnvironment.getApiLevel()); // output is "22"
MainActivity activity = Robolectric.setupActivity(MainActivity.class);
assertNotNull(activity.locationManager);
}
@Config(sdk = {23})
@Test
public void startup_config23() {
System.out.println("here packageName = " + RuntimeEnvironment.application.getPackageName());
System.out.println("here apiLevel = " + RuntimeEnvironment.getApiLevel()); // output is "23"
MainActivity activity = Robolectric.setupActivity(MainActivity.class);
assertNotNull(activity.locationManager);
}
@Config(sdk = {26})
@Test
public void startup_config26() {
System.out.println("here packageName = " + RuntimeEnvironment.application.getPackageName());
System.out.println("here apiLevel = " + RuntimeEnvironment.getApiLevel()); // output is "26"
MainActivity activity = Robolectric.setupActivity(MainActivity.class);
assertNotNull(activity.locationManager);
}
}In order to make the app build successfully, I removed dependencies on androidx.XXXXX (because androidx requires higher compileSdk), and the app successfully ran on my Pixel Android 12, API 31.
I wrote several test functions here.
Because PictureInPictureParams is added in API 26, and ShadowActivity referenced PictureInPictureParams link
However, if I change compileSdk to 34, then all test functions in MainActivityTest will succeed when run one by one
android {
namespace = "com.example.testlocationmanager3"
compileSdk = 34 # high API
defaultConfig {
applicationId = "com.example.testlocationmanager3"
minSdk = 21
targetSdk = 22 # intentional super low target sdk
versionCode = 1
versionName = "1.0"
}
...
}
Change targetSdk to high API test(s) will still fail
android {
namespace = "com.example.testlocationmanager3"
compileSdk = 22 # intentional super low target sdk
defaultConfig {
applicationId = "com.example.testlocationmanager3"
minSdk = 21
targetSdk = 34 # high API
versionCode = 1
versionName = "1.0"
}
...
}
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