diff --git a/tests/TestMachineAction.py b/tests/TestMachineAction.py
index fe9b676d23..2c3e7e95a6 100644
--- a/tests/TestMachineAction.py
+++ b/tests/TestMachineAction.py
@@ -1 +1,37 @@
-#Todo: Write tests
\ No newline at end of file
+#Todo: Write tests
+
+import pytest
+
+from cura.MachineAction import MachineAction
+from cura.MachineActionManager import MachineActionManager, NotUniqueMachineAction
+
+class Machine:
+    def __init__(self, key = ""):
+        self._key = key
+
+    def getKey(self):
+        return self._key
+
+
+def test_addMachineAction():
+
+    machine_manager = MachineActionManager()
+
+    test_action = MachineAction(key = "test")
+    test_machine = Machine("test_machine")
+    machine_manager.addMachineAction(test_action)
+
+    assert machine_manager.getMachineAction("test") == test_action
+
+    # Adding the same machine action is not allowed.
+    with pytest.raises(NotUniqueMachineAction):
+        machine_manager.addMachineAction(test_action)
+
+    # Check if adding a supported action works.
+    machine_manager.addSupportedAction(test_machine, "test")
+    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}
+