code: def test_simplify():
      assert list(
          Segment.simplify(
              [Segment("Hello"), Segment(" "), Segment("World!")]
          )
      ) == [Segment("Hello World!")]
      assert list(
          Segment.simplify(
              [
                  Segment("Hello", "red"),
                  Segment(" ", "red"),
                  Segment("World!", "blue"),
              ]
          )
      ) == [Segment("Hello ", "red"), Segment("World!", "blue")]
      assert list(Segment.simplify([])) == []
  
imports: from io import StringIO
  import pytest
  from rich.segment import ControlType, Segment, SegmentLines, Segments
  from rich.style import Style
label_desc: Use image node_id 10 for calling a global function with example usage: test_simplify() without return types