class_docstr: Test the OptsSpec parser works correctly for plot options.
code: def test_plot_opts_dict_with_space(self):
      line = "Curve [fontsize={'xlabel': 10, 'title': 20}]"
      expected = {
          "Curve": {
              "plot": Options(fontsize={"xlabel": 10, "title": 20})
          }
      }
      self.assertEqual(OptsSpec.parse(line), expected)
  
imports: from unittest import SkipTest
  from holoviews.element.comparison import ComparisonTestCase
  from holoviews.core.options import Cycle, Options
label_desc: Use image node_id 5 for calling the OptsSpecPlotOptionsTests obj's underlying member method code with example usage: obj.test_plot_opts_dict_with_space() without return types