diff --git a/tests/Settings/TestGlobalStack.py b/tests/Settings/TestGlobalStack.py
index 83b5226109..d2f2bc881e 100644
--- a/tests/Settings/TestGlobalStack.py
+++ b/tests/Settings/TestGlobalStack.py
@@ -6,7 +6,7 @@ import pytest #This module contains unit tests.
 import unittest.mock #To monkeypatch some mocks in place of dependencies.
 
 import cura.Settings.GlobalStack #The module we're testing.
-from cura.Settings.Exceptions import TooManyExtrudersError #To test raising this error.
+from cura.Settings.Exceptions import TooManyExtrudersError, InvalidOperationError #To test raising these errors.
 from UM.Settings.DefinitionContainer import DefinitionContainer #To test against the class DefinitionContainer.
 import UM.Settings.ContainerRegistry
 import UM.Settings.ContainerStack
@@ -50,6 +50,11 @@ def readStack(filename):
 
 #############################START OF TEST CASES################################
 
+##  Tests whether adding a container is properly forbidden.
+def test_addContainer(global_stack):
+    with pytest.raises(InvalidOperationError):
+        global_stack.addContainer(unittest.mock.MagicMock())
+
 ##  Tests adding extruders to the global stack.
 def test_addExtruder(global_stack):
     mock_definition = unittest.mock.MagicMock()
@@ -301,4 +306,18 @@ def test_hasUserValueQualityChanges(global_stack):
 
     assert not global_stack.hasUserValue("infill_sparse_density")
     assert global_stack.hasUserValue("layer_height")
-    assert not global_stack.hasUserValue("")
\ No newline at end of file
+    assert not global_stack.hasUserValue("")
+
+##  Tests whether inserting a container is properly forbidden.
+def test_insertContainer(global_stack):
+    with pytest.raises(InvalidOperationError):
+        global_stack.insertContainer(0, unittest.mock.MagicMock())
+
+def test_removeContainer(global_stack):
+    with pytest.raises(InvalidOperationError):
+        global_stack.removeContainer(unittest.mock.MagicMock())
+
+##  Tests whether changing the next stack is properly forbidden.
+def test_setNextStack(global_stack):
+    with pytest.raises(InvalidOperationError):
+        global_stack.setNextStack(unittest.mock.MagicMock())
\ No newline at end of file