diff --git a/cura/Scene/GCodeListDecorator.py b/cura/Scene/GCodeListDecorator.py
index 572fea6ac4..d3dadb3f23 100644
--- a/cura/Scene/GCodeListDecorator.py
+++ b/cura/Scene/GCodeListDecorator.py
@@ -10,10 +10,10 @@ class GCodeListDecorator(SceneNodeDecorator):
     def getGCodeList(self) -> List[str]:
         return self._gcode_list
 
-    def setGCodeList(self, list: List[str]):
+    def setGCodeList(self, list: List[str]) -> None:
         self._gcode_list = list
 
     def __deepcopy__(self, memo) -> "GCodeListDecorator":
         copied_decorator = GCodeListDecorator()
         copied_decorator.setGCodeList(self.getGCodeList())
-        return copied_decorator
\ No newline at end of file
+        return copied_decorator
diff --git a/tests/TestGCodeListDecorator.py b/tests/TestGCodeListDecorator.py
new file mode 100644
index 0000000000..058aa132f9
--- /dev/null
+++ b/tests/TestGCodeListDecorator.py
@@ -0,0 +1,16 @@
+from cura.Scene.GCodeListDecorator import GCodeListDecorator
+
+
+def test_setAndGetList():
+    decorator = GCodeListDecorator()
+
+    decorator.setGCodeList(["Test"])
+    assert decorator.getGCodeList() == ["Test"]
+
+
+def test_copyGCodeDecorator():
+    decorator = GCodeListDecorator()
+    decorator.setGCodeList(["Test"])
+    import copy
+    copied_decorator = copy.deepcopy(decorator)
+    assert decorator.getGCodeList() == copied_decorator.getGCodeList()