public LineMarkerInfo getLineMarkerInfo(@NotNull PsiElement element) {
    if (ApplicationManager.getApplication().isUnitTestMode()) {
      return null;
    }

    if (!(element instanceof PsiMethod) && !(element instanceof PsiClass)) {
      return null;
    }

    if (!PsiUtil.isPluginProject(element.getProject())) {
      return null;
    }

    final VirtualFile file = PsiUtilCore.getVirtualFile(element);
    if (file == null
        || !ProjectFileIndex.SERVICE
            .getInstance(element.getProject())
            .isInTestSourceContent(file)) {
      return null;
    }
    if (element instanceof PsiMethod) {
      final PsiMethod method = (PsiMethod) element;
      if (isTestMethod(method)) {
        return new LineMarkerInfo<PsiMethod>(
            method,
            method.getModifierList().getTextRange(),
            PlatformIcons.TEST_SOURCE_FOLDER,
            Pass.UPDATE_ALL,
            null,
            new TestDataNavigationHandler(),
            GutterIconRenderer.Alignment.LEFT);
      }
    } else {
      final PsiClass psiClass = (PsiClass) element;
      final String basePath = getTestDataBasePath(psiClass);
      if (basePath != null) {
        PsiModifierList modifierList = psiClass.getModifierList();
        assert modifierList != null;
        return new LineMarkerInfo<PsiClass>(
            psiClass,
            modifierList.getTextRange(),
            PlatformIcons.TEST_SOURCE_FOLDER,
            Pass.UPDATE_ALL,
            new TooltipProvider(basePath),
            new GutterIconNavigationHandler<PsiClass>() {
              @Override
              public void navigate(MouseEvent e, PsiClass elt) {
                final VirtualFile baseDir = VfsUtil.findFileByIoFile(new File(basePath), true);
                if (baseDir != null) {
                  new OpenFileDescriptor(psiClass.getProject(), baseDir).navigate(true);
                }
              }
            },
            GutterIconRenderer.Alignment.LEFT);
      }
    }
    return null;
  }