private static boolean isTestMethod(@NotNull PsiMethod method) {
    if (isTestMethodWithAnnotation(method)) {
      return true;
    }

    final List<String> files =
        TestDataGuessByExistingFilesUtil.collectTestDataByExistingFiles(method);
    return files != null && !files.isEmpty();
  }
  @Nullable
  public static List<String> findTestDataFiles(@NotNull DataContext context) {
    final PsiMethod method = findTargetMethod(context);
    if (method == null) {
      return null;
    }
    final String name = method.getName();

    if (name.startsWith("test")) {
      String testDataPath =
          TestDataLineMarkerProvider.getTestDataBasePath(method.getContainingClass());
      final TestDataReferenceCollector collector =
          new TestDataReferenceCollector(testDataPath, name.substring(4));
      return collector.collectTestDataReferences(method);
    }

    final Location<?> location = Location.DATA_KEY.getData(context);
    if (location instanceof PsiMemberParameterizedLocation) {
      PsiClass containingClass = ((PsiMemberParameterizedLocation) location).getContainingClass();
      if (containingClass == null) {
        containingClass =
            PsiTreeUtil.getParentOfType(location.getPsiElement(), PsiClass.class, false);
      }
      if (containingClass != null) {
        final PsiAnnotation annotation =
            AnnotationUtil.findAnnotationInHierarchy(
                containingClass, Collections.singleton(JUnitUtil.RUN_WITH));
        if (annotation != null) {
          final PsiAnnotationMemberValue memberValue = annotation.findAttributeValue("value");
          if (memberValue instanceof PsiClassObjectAccessExpression) {
            final PsiTypeElement operand =
                ((PsiClassObjectAccessExpression) memberValue).getOperand();
            if (operand.getType().equalsToText(Parameterized.class.getName())) {
              final String testDataPath =
                  TestDataLineMarkerProvider.getTestDataBasePath(containingClass);
              final String paramSetName =
                  ((PsiMemberParameterizedLocation) location).getParamSetName();
              final String baseFileName =
                  StringUtil.trimEnd(StringUtil.trimStart(paramSetName, "["), "]");
              final ProjectFileIndex fileIndex =
                  ProjectRootManager.getInstance(containingClass.getProject()).getFileIndex();
              return TestDataGuessByExistingFilesUtil.suggestTestDataFiles(
                  fileIndex, baseFileName, testDataPath, containingClass);
            }
          }
        }
      }
    }

    return null;
  }
  @Nullable
  List<String> collectTestDataReferences(@NotNull final PsiMethod method) {
    myContainingClass = method.getContainingClass();
    List<String> result =
        collectTestDataReferences(method, new HashMap<String, Computable<String>>());
    if (!myFoundTestDataParameters) {
      myLogMessages.add("Found no parameters annotated with @TestDataFile");
    }

    if (result == null || result.isEmpty()) {
      result = TestDataGuessByExistingFilesUtil.collectTestDataByExistingFiles(method);
    }
    return result;
  }
 private static boolean isTestMethodWithAnnotation(@NotNull PsiMethod method) {
   String name = method.getName();
   if (!name.startsWith("test")) {
     return false;
   }
   String testDataPath = getTestDataBasePath(method.getContainingClass());
   if (testDataPath == null) {
     return false;
   }
   List<String> fileNames =
       new TestDataReferenceCollector(
               testDataPath, TestDataGuessByExistingFilesUtil.getTestName(name))
           .collectTestDataReferences(method);
   return fileNames != null && !fileNames.isEmpty();
 }