public @NotNull PsiFile createDummyFile(@NotNull String content) {
    final PsiFileFactory psiFileFactory = PsiFileFactory.getInstance(myProject);
    return psiFileFactory.createFileFromText("dummy." + JsonFileType.INSTANCE.getDefaultExtension(), JsonFileType.INSTANCE, content);
  }
public @NotNull PsiFile createDummyFile(@NotNull String content)