text: import pytest
  import os
  import matplotlib as mpl
  
  mpl.use("Agg")
  
  import trackintel as ti
  from trackintel.visualization.util import regular_figure
  
  
  @pytest.fixture
  def test_data():
      """Read tests data from files."""
      pfs_file = os.path.join("examples", "data", "geolife_trajectory.csv")
      pfs = ti.read_positionfixes_csv(pfs_file, sep=";", index_col=None, crs="EPSG:4326")
  
      pfs, stps = pfs.as_positionfixes.generate_staypoints(method="sliding")
      pfs, tpls = pfs.as_positionfixes.generate_triplegs(stps, method="between_staypoints")
  
      return pfs, stps, tpls
  
  
  class TestPlot_triplegs:
      """Tests for plot_triplegs() method."""
  
      def test_triplegs_plot(self, test_data):
          """Use trackintel visualization function to plot triplegs and check if the file exists."""
          pfs, stps, tpls = test_data
  
          tmp_file = os.path.join("tests", "data", "triplegs_plot1.png")
          tpls.as_triplegs.plot(out_filename=tmp_file, positionfixes=pfs, staypoints=stps, plot_osm=False)
          assert os.path.exists(tmp_file)
          os.remove(tmp_file)
  
      def test_axis(self, test_data):
          """Test the use of regular_figure() to create axis."""
          _, _, tpls = test_data
          tmp_file = os.path.join("tests", "data", "triplegs_plot2.png")
          _, ax = regular_figure()
  
          tpls.as_triplegs.plot(out_filename=tmp_file, axis=ax)
          assert os.path.exists(tmp_file)
          os.remove(tmp_file)
  
      def test_parameter(self, test_data):
          """Test other parameter configurations."""
          _, _, tpls = test_data
          tmp_file = os.path.join("tests", "data", "triplegs_plot3.png")
  
          # test plot_osm
          tpls.as_triplegs.plot(out_filename=tmp_file, plot_osm=True)
          assert os.path.exists(tmp_file)
          os.remove(tmp_file)
  