@Override
  public boolean isSelected(final AnActionEvent e) {
    final VirtualFile[] selectedFiles = getSelectedFiles();
    if (selectedFiles.length == 0) return false;

    final ContentEntryEditor editor = myEntryTreeEditor.getContentEntryEditor();
    return myEditTestSources
        ? editor.isTestSource(selectedFiles[0])
        : editor.isSource(selectedFiles[0]);
  }