diff --git a/tests/Settings/TestGlobalStack.py b/tests/Settings/TestGlobalStack.py
index 94cb1f9abb..6ae33b1e34 100644
--- a/tests/Settings/TestGlobalStack.py
+++ b/tests/Settings/TestGlobalStack.py
@@ -445,4 +445,18 @@ def test_setPropertyOtherContainers(target_container, global_stack):
         "definition_changes": global_stack.definition_changes,
         "definition": global_stack.definition
     }
-    assert containers[target_container].getProperty(key, property) == output_value
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+    assert containers[target_container].getProperty(key, property) == output_value
+
+##  Tests adding a variant by specifying an ID of a variant that exists.
+def test_setVariantByIdExists(global_stack, container_registry):
+    original_container_registry = UM.Settings.ContainerStack._containerRegistry
+    UM.Settings.ContainerStack._containerRegistry = container_registry #Always has all the profiles you ask of.
+
+    global_stack.setVariantById("some_variant") #The container registry always has a container with the ID.
+
+    UM.Settings.ContainerStack._containerRegistry = original_container_registry
+
+##  Tests adding a variant by specifying an ID of a variant that doesn't exist.
+def test_setVariantByIdDoesntExist(global_stack):
+    with pytest.raises(KeyError):
+        global_stack.setVariantById("some_variant") #Container registry is empty now.
\ No newline at end of file