diff --git a/tests/TestMachineAction.py b/tests/TestMachineAction.py
index 2c3e7e95a6..b6f041dff8 100644
--- a/tests/TestMachineAction.py
+++ b/tests/TestMachineAction.py
@@ -3,7 +3,7 @@
 import pytest
 
 from cura.MachineAction import MachineAction
-from cura.MachineActionManager import MachineActionManager, NotUniqueMachineAction
+from cura.MachineActionManager import MachineActionManager, NotUniqueMachineAction, UnknownMachineAction
 
 class Machine:
     def __init__(self, key = ""):
@@ -17,21 +17,46 @@ def test_addMachineAction():
 
     machine_manager = MachineActionManager()
 
-    test_action = MachineAction(key = "test")
+    test_action = MachineAction(key = "test_action")
+    test_action_2 = MachineAction(key = "test_action_2")
     test_machine = Machine("test_machine")
     machine_manager.addMachineAction(test_action)
+    machine_manager.addMachineAction(test_action_2)
 
-    assert machine_manager.getMachineAction("test") == test_action
+    assert machine_manager.getMachineAction("test_action") == test_action
+    assert machine_manager.getMachineAction("key_that_doesnt_exist") is None
 
     # Adding the same machine action is not allowed.
     with pytest.raises(NotUniqueMachineAction):
         machine_manager.addMachineAction(test_action)
 
+    # Check that the machine has no supported actions yet.
+    assert machine_manager.getSupportedActions(test_machine) == set()
+
     # Check if adding a supported action works.
-    machine_manager.addSupportedAction(test_machine, "test")
+    machine_manager.addSupportedAction(test_machine, "test_action")
     assert machine_manager.getSupportedActions(test_machine) == {test_action}
 
     # Check that adding a unknown action doesn't change anything.
     machine_manager.addSupportedAction(test_machine, "key_that_doesnt_exist")
     assert machine_manager.getSupportedActions(test_machine) == {test_action}
 
+    # Check if adding multiple supported actions works.
+    machine_manager.addSupportedAction(test_machine, "test_action_2")
+    assert machine_manager.getSupportedActions(test_machine) == {test_action, test_action_2}
+
+    # Check that the machine has no required actions yet.
+    assert machine_manager.getRequiredActions(test_machine) == set()
+
+    ## Ensure that only known actions can be added.
+    with pytest.raises(UnknownMachineAction):
+        machine_manager.addRequiredAction(test_machine, "key_that_doesnt_exist")
+
+    ## Check if adding single required action works
+    machine_manager.addRequiredAction(test_machine, "test_action")
+    assert machine_manager.getRequiredActions(test_machine) == {test_action}
+
+    # Check if adding multiple required actions works.
+    machine_manager.addRequiredAction(test_machine, "test_action_2")
+    assert machine_manager.getRequiredActions(test_machine) == {test_action, test_action_2}
+