code: def test_trace_repr(self):
      N = 100
      scatt = go.Scatter(
          y=list(range(N)),
          marker={
              "color": "green",
              "opacity": [e / N for e in range(N)],
          },
      )
  
      expected = """\
  Scatter({
      'marker': {'color': 'green',
                 'opacity': [0.0, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08,
                             0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17,
                             0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26,
                             0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, 0.35,
                             0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44,
                             0.45, 0.46, 0.47, 0.48, 0.49, 0.5, 0.51, 0.52, 0.53,
                             0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62,
                             0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.71,
                             0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8,
                             0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89,
                             0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98,
                             0.99]},
      'y': [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
            20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
            38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55,
            56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73,
            74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91,
            92, 93, 94, 95, 96, 97, 98, 99]
  })"""
      self.assertEqual(scatt.__repr__(), expected)
  
imports: from unittest import TestCase
  import plotly.graph_objs
label_desc: Use image node_id 1 for calling the TestGraphObjRepr obj's underlying member method code with example usage: obj.test_trace_repr() without return types