old_contents: import pytest
  
  from examples.gbest_pso import main as gbest
  from examples.lbest_pso import main as lbest
  from examples.gc_pso import main as gc
  from examples.pso_optimizer import main as pso_optimizer
  
  
  @pytest.mark.parametrize("dimension", [
      1,
      30
  ])
  @pytest.mark.parametrize("iterations", [
      3
  ])
  def test_gbest_pso(dimension, iterations):
      gbest(dimension, iterations)
  
  
  @pytest.mark.parametrize("dimension", [
      1,
      30
  ])
  @pytest.mark.parametrize("iterations", [
      3
  ])
  def test_lbest_pso(dimension, iterations):
      lbest(dimension, iterations)
  
  
  @pytest.mark.parametrize("dimension", [
      1,
      30
  ])
  @pytest.mark.parametrize("iterations", [
      3
  ])
  def test_gc_pso(dimension, iterations):
      gc(dimension, iterations)
  
  
  @pytest.mark.parametrize("dimension", [
      1,
      30
  ])
  @pytest.mark.parametrize("iterations", [
      3
  ])
  def test_gc_pso(dimension, iterations):
      pso_optimizer(dimension, iterations)
  
new_contents: # Copyright 2016 Andrich van Wyk
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  # http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  """ Tests ensuring examples execute
  """
  import pytest
  
  from examples.gbest_pso import main as gbest
  from examples.gc_pso import main as gc
  from examples.lbest_pso import main as lbest
  from examples.pso_optimizer import main as pso_optimizer
  
  
  @pytest.mark.parametrize("dimension", [
      1,
      30
  ])
  @pytest.mark.parametrize("iterations", [
      3
  ])
  def test_gbest_pso(dimension, iterations):
      gbest(dimension, iterations)
  
  
  @pytest.mark.parametrize("dimension", [
      1,
      30
  ])
  @pytest.mark.parametrize("iterations", [
      3
  ])
  def test_lbest_pso(dimension, iterations):
      lbest(dimension, iterations)
  
  
  @pytest.mark.parametrize("dimension", [
      1,
      30
  ])
  @pytest.mark.parametrize("iterations", [
      3
  ])
  def test_gc_pso(dimension, iterations):
      gc(dimension, iterations)
  
  
  @pytest.mark.parametrize("dimension", [
      1,
      30
  ])
  @pytest.mark.parametrize("iterations", [
      3
  ])
  def test_gc_pso(dimension, iterations):
      pso_optimizer(dimension, iterations)
  
subject: Add license header and file documentation