code: def multi_line(two_line_gdf):
      """Create a multi-line GeoDataFrame.
  
      This has one multi line and another regular line.
      """
      # Create a single and multi line object
      multiline_feat = two_line_gdf.unary_union
      linec = LineString([(2, 1), (3, 1), (4, 1), (5, 2)])
      out_df = gpd.GeoDataFrame(
          geometry=gpd.GeoSeries([multiline_feat, linec]),
          crs="epsg:4326",
      )
      out_df = out_df.rename(columns={0: "geometry"}).set_geometry(
          "geometry"
      )
      out_df["attr"] = ["road", "stream"]
      return out_df
  
file_path: earthpy/earthpy/tests/test_clip.py
imports: import pytest
  import numpy
  from shapely.geometry import Polygon, Point, LineString
  import geopandas
  import earthpy.clip
label_desc: Use image node_id 4 for calling a global function with example usage: multi_line(two_line_gdf) and returns: out_df