code: def test_repr(self) -> None:
      c = bcc.RGB(10, 20, 30)
      assert repr(c) == c.to_css()
      c = bcc.RGB(10, 20, 30, 0.3)
      assert repr(c) == c.to_css()
  
imports: from __future__ import annotations
  import pytest
  import bokeh.colors.color
label_desc: Use image node_id 2 for calling the Test_RGB obj's underlying member method code with example usage: obj.test_repr() without return types