code: def test_adjust_brightness_style_transformation(default_attrs):
      tr = AdjustBrightnessStyleTransformation(0.5, 1.0)
  
      attrs = tr.transform_attrs(default_attrs._replace(color="ff0000"))
      assert attrs.color == "ff7f7f"
  
      attrs = tr.transform_attrs(default_attrs._replace(color="00ffaa"))
      assert attrs.color == "7fffd4"
  
      # When a background color is given, nothing should change.
      attrs = tr.transform_attrs(
          default_attrs._replace(color="00ffaa", bgcolor="white")
      )
      assert attrs.color == "00ffaa"
  
      # Test ansi colors.
      attrs = tr.transform_attrs(
          default_attrs._replace(color="ansiblue")
      )
      assert attrs.color == "6666ff"
  
      # Test 'ansidefault'. This shouldn't change.
      attrs = tr.transform_attrs(
          default_attrs._replace(color="ansidefault")
      )
      assert attrs.color == "ansidefault"
  
      # When 0 and 1 are given, don't do any style transformation.
      tr2 = AdjustBrightnessStyleTransformation(0, 1)
  
      attrs = tr2.transform_attrs(
          default_attrs._replace(color="ansiblue")
      )
      assert attrs.color == "ansiblue"
  
      attrs = tr2.transform_attrs(
          default_attrs._replace(color="00ffaa")
      )
      assert attrs.color == "00ffaa"
  
imports: from __future__ import annotations
  import pytest
  from prompt_toolkit.styles import AdjustBrightnessStyleTransformation, Attrs
label_desc: Use image node_id 2 for calling a global function with example usage: test_adjust_brightness_style_transformation(default_attrs) without return types