text: # Copyright (c) 2016 MetPy Developers.
  # Distributed under the terms of the BSD 3-Clause License.
  # SPDX-License-Identifier: BSD-3-Clause
  """Test the `polygons` module."""
  
  from __future__ import division
  
  from numpy.testing import assert_almost_equal, assert_array_equal
  
  from metpy.gridding.polygons import (area, order_edges)
  
  
  def test_area():
      r"""Test get area of polygon function."""
      pt0 = [0, 0]
      pt1 = [5, 5]
      pt2 = [5, 0]
  
      truth = 12.5
  
      assert_almost_equal(area([pt0, pt1, pt2]), truth)
  
  
  def test_order_edges():
      r"""Test order edges of polygon function."""
      edges = [[1, 2], [5, 6], [4, 5], [2, 3], [6, 1], [3, 4]]
  
      truth = [[1, 2], [2, 3], [3, 4], [4, 5], [5, 6], [6, 1]]
  
      assert_array_equal(truth, order_edges(edges))
  