Add stubs for MachineManager testing

It also adds a first test that checks if the setActiveMachine

cura/Settings/MachineManager.py

@@ -363,6 +363,7 @@ class MachineManager(QObject):
             ConfigurationErrorMessage.getInstance().addFaultyContainers(global_stack.getId())
             return  # We're done here
         ExtruderManager.getInstance().setActiveExtruderIndex(0)  # Switch to first extruder
+
         self._global_container_stack = global_stack
         self._application.setGlobalContainerStack(global_stack)
         ExtruderManager.getInstance()._globalContainerStackChanged()

tests/TestMachineManager.py

@@ -0,0 +1,43 @@
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from UM.Settings.ContainerRegistry import ContainerRegistry
+from cura.Settings.ExtruderManager import ExtruderManager
+from cura.Settings.MachineManager import MachineManager
+
+
+@pytest.fixture()
+def container_registry() -> ContainerRegistry:
+    return MagicMock()
+
+@pytest.fixture()
+def extruder_manager(application, container_registry) -> ExtruderManager:
+    with patch("cura.CuraApplication.CuraApplication.getInstance", MagicMock(return_value=application)):
+        with patch("UM.Settings.ContainerRegistry.ContainerRegistry.getInstance", MagicMock(return_value=container_registry)):
+                manager = ExtruderManager()
+    return manager
+
+@pytest.fixture()
+def machine_manager(application, extruder_manager, container_registry) -> MachineManager:
+    application.getExtruderManager = MagicMock(return_value = extruder_manager)
+    with patch("cura.Settings.CuraContainerRegistry.CuraContainerRegistry.getInstance", MagicMock(return_value=container_registry)):
+        manager = MachineManager(application)
+
+    return manager
+
+
+def test_setActiveMachine(machine_manager):
+    registry = MagicMock()
+
+    mocked_global_stack = MagicMock()
+
+    mocked_global_stack.getId = MagicMock(return_value = "test_machine")
+    registry.findContainerStacks = MagicMock(return_value = [mocked_global_stack])
+    with patch("cura.Settings.CuraContainerRegistry.CuraContainerRegistry.getInstance", MagicMock(return_value=registry)):
+        with patch("UM.Settings.ContainerRegistry.ContainerRegistry.getInstance", MagicMock(return_value=registry)):
+            machine_manager.setActiveMachine("test_machine")
+
+            # Although we mocked the application away, we still want to know if it was notified about the attempted change.
+            machine_manager._application.setGlobalContainerStack.assert_called_with(mocked_global_stack)
+

tests/TestPrintInformation.py

@@ -77,6 +77,9 @@ def test_duration():
     # Fake a print duration message
     print_information._onPrintDurationMessage(0, {"Travel": 20}, [10])
 
+    # We only set a single time, so the total time must be of the same value.
+    assert int(print_information.currentPrintTime) == 20
+
     feature_print_times = print_information.getFeaturePrintTimes()
     assert int(feature_print_times["Travel"]) == 20