packages/google_maps_flutter/google_maps_flutter/example/android/app/src/test/java/io/flutter/plugins/googlemaps/GoogleMapControllerTest.java

package io.flutter.plugins.googlemaps;

import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;

import android.content.Context;
import androidx.activity.ComponentActivity;
import androidx.test.core.app.ApplicationProvider;
import com.google.android.gms.maps.GoogleMap;
import io.flutter.plugin.common.BinaryMessenger;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.robolectric.Robolectric;
import org.robolectric.RobolectricTestRunner;

@RunWith(RobolectricTestRunner.class)
public class GoogleMapControllerTest {

  private Context context;
  private ComponentActivity activity;
  private GoogleMapController googleMapController;

  @Mock BinaryMessenger mockMessenger;
  @Mock GoogleMap mockGoogleMap;

  @Before
  public void before() {
    MockitoAnnotations.initMocks(this);
    context = ApplicationProvider.getApplicationContext();
    activity = Robolectric.setupActivity(ComponentActivity.class);
    googleMapController =
        new GoogleMapController(0, context, mockMessenger, activity::getLifecycle, null);
    googleMapController.init();
  }

  @Test
  public void DisposeReleaseTheMap() throws InterruptedException {
    googleMapController.onMapReady(mockGoogleMap);
    assertTrue(googleMapController != null);
    googleMapController.dispose();
    assertNull(googleMapController.getView());
  }

  @Test
  public void OnDestroyReleaseTheMap() throws InterruptedException {
    googleMapController.onMapReady(mockGoogleMap);
    assertTrue(googleMapController != null);
    googleMapController.onDestroy(activity);
    assertNull(googleMapController.getView());
  }
}