FlutterMain.setIsRunningInRobolectricTest on Android removed

If you write Java JUnit tests (such as Robolectric tests) against the Flutter engine's Java embedding and used the FlutterMain.setIsRunningInRobolectricTest(true) API, replace it with the following:

FlutterJNI mockFlutterJNI = mock(FlutterJNI.class);
FlutterInjector.setInstance(
        new FlutterInjector.Builder()
            .setFlutterLoader(new FlutterLoader(mockFlutterJNI))
            .build());

This should be very uncommon.

The FlutterMain class itself is being deprecated and replaced with the FlutterInjector class. The FlutterMain class uses a number of static variables and functions than make it difficult to test. FlutterMain.setIsRunningInRobolectricTest() is one ad-hoc static mechanism to allow tests to run on the host machine on JVM without loading the libflutter.so native library (which can't be done on the host machine).

Rather than one-off solutions, all dependency injections needed for tests in Flutter's Android/Java engine embedding are now moved to the FlutterInjector class.

Within the FlutterInjector class, the setFlutterLoader() Builder function allows for control of how the FlutterLoader class locates and loads the libflutter.so library.

This engine commit removed the FlutterMain.setIsRunningInRobolectricTest() testing function; and the following commit added a FlutterInjector class to assist testing. PR 20473 further refactored FlutterLoader and FlutterJNI to allow for additional mocking and testing.

to allow for additional mocking/testing.

Code before migration:

FlutterMain.setIsRunningInRobolectricTest(true);

Code after migration:

FlutterJNI mockFlutterJNI = mock(FlutterJNI.class);
FlutterInjector.setInstance(
        new FlutterInjector.Builder()
            .setFlutterLoader(new FlutterLoader(mockFlutterJNI))
            .build());

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