code: def test_show_fiff():
      """Test show_fiff."""
      # this is not exhaustive, but hopefully bugs will be found in use
      info = show_fiff(fname_evoked)
      assert "BAD" not in info
      keys = [
          "FIFF_EPOCH",
          "FIFFB_HPI_COIL",
          "FIFFB_PROJ_ITEM",
          "FIFFB_PROCESSED_DATA",
          "FIFFB_EVOKED",
          "FIFF_NAVE",
          "FIFF_EPOCH",
          "COORD_TRANS",
      ]
      assert all(key in info for key in keys)
      info = show_fiff(fname_raw, read_limit=1024)
      assert "BAD" not in info
      info = show_fiff(fname_c_annot)
      assert "BAD" not in info
      assert ">B" in info, info
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_show_fiff() without return types