content: package de.danoeh.antennapod.net.download.service.episode.autodownload;
  
  import android.content.Context;
  import android.content.SharedPreferences;
  import androidx.preference.PreferenceManager;
  
  import java.io.File;
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.List;
  
  import androidx.test.platform.app.InstrumentationRegistry;
  import de.danoeh.antennapod.model.feed.Feed;
  import de.danoeh.antennapod.model.feed.FeedItem;
  import de.danoeh.antennapod.model.feed.FeedMedia;
  import de.danoeh.antennapod.net.download.serviceinterface.AutoDownloadManager;
  import de.danoeh.antennapod.storage.database.DBWriter;
  import de.danoeh.antennapod.storage.preferences.UserPreferences;
  import de.danoeh.antennapod.storage.database.PodDBAdapter;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.robolectric.RobolectricTestRunner;
  
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  
  /**
   * Tests that the APNullCleanupAlgorithm is working correctly.
   */
  @RunWith(RobolectricTestRunner.class)
  public class DbNullCleanupAlgorithmTest {
  
      private static final int EPISODE_CACHE_SIZE = 5;
  
      private Context context;
  
      private File destFolder;
  
      @Before
      public void setUp() {
          context = InstrumentationRegistry.getInstrumentation().getTargetContext();
          destFolder = context.getExternalCacheDir();
          cleanupDestFolder(destFolder);
          assertNotNull(destFolder);
          assertTrue(destFolder.exists());
          assertTrue(destFolder.canWrite());
  
          // create new database
          PodDBAdapter.init(context);
          PodDBAdapter.deleteDatabase();
          PodDBAdapter adapter = PodDBAdapter.getInstance();
          adapter.open();
          adapter.close();
  
          SharedPreferences.Editor prefEdit = PreferenceManager.getDefaultSharedPreferences(context
                  .getApplicationContext()).edit();
          prefEdit.putString(UserPreferences.PREF_EPISODE_CACHE_SIZE, Integer.toString(EPISODE_CACHE_SIZE));
          prefEdit.putString(UserPreferences.PREF_EPISODE_CLEANUP,
                  Integer.toString(UserPreferences.EPISODE_CLEANUP_NULL));
          prefEdit.commit();
  
          UserPreferences.init(context);
          AutoDownloadManager.setInstance(new AutoDownloadManagerImpl());
      }
  
      @After
      public void tearDown() {
          DBWriter.tearDownTests();
          PodDBAdapter.deleteDatabase();
          PodDBAdapter.tearDownTests();
  
          cleanupDestFolder(destFolder);
          assertTrue(destFolder.delete());
      }
  
      private void cleanupDestFolder(File destFolder) {
          //noinspection ConstantConditions
          for (File f : destFolder.listFiles()) {
              assertTrue(f.delete());
          }
      }
  
      /**
       * A test with no items in the queue, but multiple items downloaded.
       * The null algorithm should never delete any items, even if they're played and not in the queue.
       */
      @Test
      public void testPerformAutoCleanupShouldNotDelete() throws IOException {
          final int numItems = EPISODE_CACHE_SIZE * 2;
  
          Feed feed = new Feed("url", null, "title");
          List<FeedItem> items = new ArrayList<>();
          feed.setItems(items);
          List<File> files = new ArrayList<>();
          for (int i = 0; i < numItems; i++) {
              FeedItem item = new FeedItem(0, "title", "id" + i, "link", new Date(), FeedItem.PLAYED, feed);
  
              File f = new File(destFolder, "file " + i);
              assertTrue(f.createNewFile());
              files.add(f);
              item.setMedia(new FeedMedia(0, item, 1, 0, 1L, "m", f.getAbsolutePath(), "url", System.currentTimeMillis(),
                      new Date(numItems - i), 0, 0));
              items.add(item);
          }
  
          PodDBAdapter adapter = PodDBAdapter.getInstance();
          adapter.open();
          adapter.setCompleteFeed(feed);
          adapter.close();
  
          assertTrue(feed.getId() != 0);
          for (FeedItem item : items) {
              assertTrue(item.getId() != 0);
              //noinspection ConstantConditions
              assertTrue(item.getMedia().getId() != 0);
          }
          AutoDownloadManager.getInstance().performAutoCleanup(context);
          for (int i = 0; i < files.size(); i++) {
              assertTrue(files.get(i).exists());
          }
      }
  }
  