text: import numpy as np
  
  from dials.algorithms.symmetry.cosym import plots
  
  
  def test_plot_coords():
      coords = np.array([0.5, 0.5, 0, 1, 0, 1, 1, 0, 1, 0]).reshape(5, 2)
      labels = np.array([-1, 0, 0, 1, 1])
      d = plots.plot_coords(coords, labels=labels)
      assert "cosym_coordinates" in d
      assert set(d["cosym_coordinates"]) == {"data", "help", "layout"}
      assert (
          d["cosym_coordinates"]["data"][0]["marker"]["color"]
          == "rgb(0.000000,0.000000,0.000000)"
      )
      assert d["cosym_coordinates"]["data"][0]["x"] == [0.5]
      assert d["cosym_coordinates"]["data"][0]["y"] == [0.5]
      assert d["cosym_coordinates"]["data"][1]["x"] == [0.0, 0.0]
      assert d["cosym_coordinates"]["data"][1]["y"] == [1.0, 1.0]
      assert d["cosym_coordinates"]["data"][2]["x"] == [1.0, 1.0]
      assert d["cosym_coordinates"]["data"][2]["y"] == [0.0, 0.0]
  
  
  def test_plot_rij_histogram():
      rij_matrix = np.random.rand(16)
      d = plots.plot_rij_histogram(rij_matrix)
      assert "cosym_rij_histogram" in d
      assert sum(d["cosym_rij_histogram"]["data"][0]["y"]) == 16
  