diff --git a/tests/TestCuraSceneController.py b/tests/TestCuraSceneController.py
new file mode 100644
index 0000000000..ffffa8ac2a
--- /dev/null
+++ b/tests/TestCuraSceneController.py
@@ -0,0 +1,79 @@
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from UM.Scene.SceneNode import SceneNode
+from cura.Machines.Models.MultiBuildPlateModel import MultiBuildPlateModel
+from cura.Scene.CuraSceneController import CuraSceneController
+from cura.UI.ObjectsModel import ObjectsModel
+
+
+@pytest.fixture
+def objects_model() -> ObjectsModel:
+    return MagicMock(spec=ObjectsModel)
+
+@pytest.fixture
+def multi_build_plate_model() -> MultiBuildPlateModel:
+    return MagicMock(spec=MultiBuildPlateModel)
+
+@pytest.fixture
+def mocked_application():
+    mocked_application = MagicMock()
+    mocked_controller = MagicMock()
+    mocked_scene = MagicMock()
+    mocked_application.getController = MagicMock(return_value=mocked_controller)
+    mocked_controller.getScene = MagicMock(return_value=mocked_scene)
+    return mocked_application
+
+
+def test_setActiveBuildPlate(objects_model, multi_build_plate_model):
+    with patch("UM.Application.Application.getInstance"):
+        controller = CuraSceneController(objects_model, multi_build_plate_model)
+    controller.setActiveBuildPlate(12)
+    multi_build_plate_model.setActiveBuildPlate.assert_called_once_with(12)
+    objects_model.setActiveBuildPlate.assert_called_once_with(12)
+
+    # Doing it again shouldn't cause another change to be passed along
+    controller.setActiveBuildPlate(12)
+    multi_build_plate_model.setActiveBuildPlate.assert_called_once_with(12)
+    objects_model.setActiveBuildPlate.assert_called_once_with(12)
+
+
+def test_calcMaxBuildPlateEmptyScene(objects_model, multi_build_plate_model, mocked_application):
+    mocked_root = MagicMock()
+    mocked_root.callDecoration = MagicMock(return_value=0)
+    mocked_application.getController().getScene().getRoot = MagicMock(return_value=mocked_root)
+    with patch("UM.Application.Application.getInstance", MagicMock(return_value=mocked_application)):
+        controller = CuraSceneController(objects_model, multi_build_plate_model)
+        assert controller._calcMaxBuildPlate() == 0
+
+
+def test_calcMaxBuildPlateFilledScene(objects_model, multi_build_plate_model, mocked_application):
+    mocked_root = MagicMock()
+    mocked_root.callDecoration = MagicMock(return_value = 0)
+    mocked_child = MagicMock()
+    mocked_child.callDecoration = MagicMock(return_value = 2)
+    mocked_root.getAllChildren = MagicMock(return_value = [mocked_child])
+    mocked_application.getController().getScene().getRoot = MagicMock(return_value=mocked_root)
+    with patch("UM.Application.Application.getInstance", MagicMock(return_value=mocked_application)):
+        controller = CuraSceneController(objects_model, multi_build_plate_model)
+        assert controller._calcMaxBuildPlate() == 2
+
+
+def test_updateMaxBuildPlate(objects_model, multi_build_plate_model):
+    with patch("UM.Application.Application.getInstance"):
+        controller = CuraSceneController(objects_model, multi_build_plate_model)
+        controller._calcMaxBuildPlate = MagicMock(return_value = 12)
+        controller.updateMaxBuildPlate(SceneNode())
+
+        # Check if that went well.
+        multi_build_plate_model.setMaxBuildPlate.assert_called_once_with(12)
+
+        # Move to a different active build plate
+        controller.setActiveBuildPlate(5)
+
+        # And check what happens if we move down again!
+        controller._calcMaxBuildPlate = MagicMock(return_value=2)
+        controller.updateMaxBuildPlate(SceneNode())
+        assert controller._active_build_plate == 0 # We don't have any items anywere, so default to 0
+