text: # Copyright (c) 2021 MetPy Developers.
  # Distributed under the terms of the BSD 3-Clause License.
  # SPDX-License-Identifier: BSD-3-Clause
  """Tests for custom Flake8 plugin for MetPy."""
  
  import ast
  
  import pytest
  
  from flake8_metpy import MetPyChecker
  
  
  @pytest.mark.parametrize('source, errs', [
      ('5 * pressure.units', 1),
      ('pw = -1. * (np.trapz(w.magnitude, pres.magnitude) * (w.units * pres.units))', 1),
      ("""def foo():
      return ret * moist_adiabat_temperatures.units""", 1),
      ('p_interp = np.sort(np.append(p_interp.m, top_pressure.m)) * pressure.units', 1),
      ('parameter = data[ob_type][subset].values * units(self.data.units[ob_type])', 1),
      ('np.nan * pressure.units', 1),
      ('np.array([1, 2, 3]) * units.m', 1),
      ('np.arange(4) * units.s', 1),
      ('np.ma.array([1, 2, 3]) * units.hPa', 1)
  ])
  def test_plugin(source, errs):
      """Test that the flake8 checker works correctly."""
      checker = MetPyChecker(ast.parse(source))
      assert len(list(checker.run())) == errs
  