@Override
  protected void onPreExecute() {
    super.onPreExecute();

    if (dbViewerFragment.databaseViewerActivity.getAppTheme().equals(AppTheme.DARK)
        || dbViewerFragment.databaseViewerActivity.getAppTheme().equals(AppTheme.BLACK)) {

      htmlInit = "<html><body><table border='1' style='width:100%;color:#ffffff'>";
    } else {

      htmlInit = "<html><body><table border='1' style='width:100%;color:#000000'>";
    }
    stringBuilder.append(htmlInit);
    dbViewerFragment.loadingText.setVisibility(View.VISIBLE);
  }
@Test
  public void testOnPreExecute() {
    DbViewerFragment mock = mock(DbViewerFragment.class);
    AppCompatTextView loadingText =
        new AppCompatTextView(ApplicationProvider.getApplicationContext());
    mock.loadingText = loadingText;
    mock.databaseViewerActivity = mock(DatabaseViewerActivity.class);
    mock.loadingText.setVisibility(View.GONE);
    when(mock.databaseViewerActivity.getAppTheme()).thenReturn(AppTheme.DARK);

    DbViewerTask task = new DbViewerTask(null, null, webView, mock);
    task.onPreExecute();
    assertEquals(VISIBLE, mock.loadingText.getVisibility());
    assertTrue(task.htmlInit.contains("color:#ffffff"));
    assertEquals("utf-8", webView.getSettings().getDefaultTextEncodingName());

    when(mock.databaseViewerActivity.getAppTheme()).thenReturn(AppTheme.BLACK);
    task = new DbViewerTask(null, null, webView, mock);
    task.onPreExecute();
    assertEquals(VISIBLE, mock.loadingText.getVisibility());
    assertTrue(task.htmlInit.contains("color:#ffffff"));
    assertEquals("utf-8", webView.getSettings().getDefaultTextEncodingName());

    when(mock.databaseViewerActivity.getAppTheme()).thenReturn(AppTheme.LIGHT);
    task = new DbViewerTask(null, null, webView, mock);
    task.onPreExecute();
    assertEquals(VISIBLE, mock.loadingText.getVisibility());
    assertTrue(task.htmlInit.contains("color:#000000"));
    assertEquals("utf-8", webView.getSettings().getDefaultTextEncodingName());
  }