code: def test_single_subplot(self):
      s = Subplots({}, {}, {})
  
      assert s.n_subplots == 1
      assert s.subplot_spec["ncols"] == 1
      assert s.subplot_spec["nrows"] == 1
      assert s.subplot_spec["sharex"] is True
      assert s.subplot_spec["sharey"] is True
  
imports: import itertools
  import numpy
  import pytest
  from seaborn._core.subplots import Subplots
label_desc: Use image node_id 1 for calling the TestSubplotSpec obj's underlying member method code with example usage: obj.test_single_subplot() without return types