diff --git a/tests/Settings/MockContainer.py b/tests/Settings/MockContainer.py
new file mode 100644
index 0000000000..c85dbf42af
--- /dev/null
+++ b/tests/Settings/MockContainer.py
@@ -0,0 +1,121 @@
+from typing import Optional
+
+from UM.Settings.Interfaces import ContainerInterface
+import UM.PluginObject
+from UM.Signal import Signal
+
+
+##  Fake container class to add to the container registry.
+#
+#   This allows us to test the container registry without testing the container
+#   class. If something is wrong in the container class it won't influence this
+#   test.
+
+class MockContainer(ContainerInterface, UM.PluginObject.PluginObject):
+    ##  Initialise a new definition container.
+    #
+    #   The container will have the specified ID and all metadata in the
+    #   provided dictionary.
+    def __init__(self, metadata = None):
+        super().__init__()
+        if metadata is None:
+            self._metadata = {}
+        else:
+            self._metadata = metadata
+        self._plugin_id = "MockContainerPlugin"
+
+    ##  Gets the ID that was provided at initialisation.
+    #
+    #   \return The ID of the container.
+    def getId(self):
+        return self._metadata["id"]
+
+    ##  Gets all metadata of this container.
+    #
+    #   This returns the metadata dictionary that was provided in the
+    #   constructor of this mock container.
+    #
+    #   \return The metadata for this container.
+    def getMetaData(self):
+        return self._metadata
+
+    ##  Gets a metadata entry from the metadata dictionary.
+    #
+    #   \param key The key of the metadata entry.
+    #   \return The value of the metadata entry, or None if there is no such
+    #   entry.
+    def getMetaDataEntry(self, entry, default = None):
+        if entry in self._metadata:
+            return self._metadata[entry]
+        return default
+
+    ##  Gets a human-readable name for this container.
+    #
+    #   \return Always returns "MockContainer".
+    def getName(self):
+        return "MockContainer"
+
+    ##  Get whether the container item is stored on a read only location in the filesystem.
+    #
+    #   \return Always returns False
+    def isReadOnly(self):
+        return False
+
+    ##  Mock get path
+    def getPath(self):
+        return "/path/to/the/light/side"
+
+    ##  Mock set path
+    def setPath(self, path):
+        pass
+
+    def getAllKeys(self):
+        pass
+
+    def setProperty(self, key, property_name, property_value, container = None, set_from_cache = False):
+        pass
+
+    def getProperty(self, key, property_name, context=None):
+        if key in self.items:
+            return self.items[key]
+
+        return None
+
+    ##  Get the value of a container item.
+    #
+    #   Since this mock container cannot contain any items, it always returns
+    #   None.
+    #
+    #   \return Always returns None.
+    def getValue(self, key):
+        pass
+
+    ##  Get whether the container item has a specific property.
+    #
+    #   This method is not implemented in the mock container.
+    def hasProperty(self, key, property_name):
+        return key in self.items
+
+    ##  Serializes the container to a string representation.
+    #
+    #   This method is not implemented in the mock container.
+    def serialize(self, ignored_metadata_keys = None):
+        raise NotImplementedError()
+
+    ##  Deserializes the container from a string representation.
+    #
+    #   This method is not implemented in the mock container.
+    def deserialize(self, serialized, file_name: Optional[str] = None):
+        raise NotImplementedError()
+
+    @classmethod
+    def getConfigurationTypeFromSerialized(cls, serialized: str):
+        raise NotImplementedError()
+
+    @classmethod
+    def getVersionFromSerialized(cls, serialized):
+        raise NotImplementedError()
+
+    metaDataChanged = Signal()
+    propertyChanged = Signal()
+    containersChanged = Signal()
diff --git a/tests/Settings/__init__.py b/tests/Settings/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000000..e69de29bb2