code: def test_select_traces_integer(select_traces_fixture):
      fig = select_traces_fixture
      # check that selecting first trace does indeed only select the first
      tr = list(fig.select_traces(selector=0))
      assert len(tr) == 1
      assert tr[0].y[1] == 0
      # check we can index last trace selected
      tr = list(fig.select_traces(selector=-1))[0]
      assert tr.y[1] == 20
      # check we can index last trace selected in a row and column
      tr = list(fig.select_traces(selector=-1, row=2, col=3))[0]
      assert tr.y[1] == 2
      # check that indexing out of bounds raises IndexError
      with pytest.raises(IndexError):
          tr = list(fig.select_traces(selector=6))[0]
  
imports: from unittest import TestCase
  import inspect
  import copy
  import pytest
  import plotly.graph_objs
  from plotly.subplots import make_subplots
  from functools import reduce
label_desc: Use image node_id 2 for calling a global function with example usage: test_select_traces_integer(select_traces_fixture) without return types