old_contents: # Copyright (c) 2017 Ultimaker B.V.
  # Cura is released under the terms of the AGPLv3 or higher.
  
  import pytest #This module contains automated tests.
  import unittest.mock #For the mocking and monkeypatching functionality.
  
  import cura.Settings.ExtruderStack #The module we're testing.
  from cura.Settings.Exceptions import InvalidOperationError #To check whether the correct exceptions are raised.
  
  ##  An empty extruder stack to test with.
  @pytest.fixture()
  def extruder_stack() -> cura.Settings.ExtruderStack.ExtruderStack:
      return cura.Settings.ExtruderStack.ExtruderStack
  
  ##  Tests whether adding a container is properly forbidden.
  def test_addContainer(extruder_stack):
      with pytest.raises(InvalidOperationError):
          extruder_stack.addContainer(unittest.mock.MagicMock())
  
  ##  Tests whether inserting a container is properly forbidden.
  def test_insertContainer(extruder_stack):
      with pytest.raises(InvalidOperationError):
          extruder_stack.insertContainer(0, unittest.mock.MagicMock())
  
  ##  Tests whether removing a container is properly forbidden.
  def test_removeContainer(extruder_stack):
      with pytest.raises(InvalidOperationError):
          extruder_stack.removeContainer(unittest.mock.MagicMock())
new_contents: # Copyright (c) 2017 Ultimaker B.V.
  # Cura is released under the terms of the AGPLv3 or higher.
  
  import pytest #This module contains automated tests.
  import unittest.mock #For the mocking and monkeypatching functionality.
  
  import cura.Settings.ExtruderStack #The module we're testing.
  from cura.Settings.Exceptions import InvalidOperationError #To check whether the correct exceptions are raised.
  
  ##  An empty extruder stack to test with.
  @pytest.fixture()
  def extruder_stack() -> cura.Settings.ExtruderStack.ExtruderStack:
      return cura.Settings.ExtruderStack.ExtruderStack
  
  #############################START OF TEST CASES################################
  
  ##  Tests whether adding a container is properly forbidden.
  def test_addContainer(extruder_stack):
      with pytest.raises(InvalidOperationError):
          extruder_stack.addContainer(unittest.mock.MagicMock())
  
  ##  Tests whether inserting a container is properly forbidden.
  def test_insertContainer(extruder_stack):
      with pytest.raises(InvalidOperationError):
          extruder_stack.insertContainer(0, unittest.mock.MagicMock())
  
  ##  Tests whether removing a container is properly forbidden.
  def test_removeContainer(extruder_stack):
      with pytest.raises(InvalidOperationError):
          extruder_stack.removeContainer(unittest.mock.MagicMock())
subject: Add delimiter between global stuff and test cases