--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/velib_python/test/mock_dbus_service.py	Sun Dec 05 14:35:36 2021 +1030
@@ -0,0 +1,58 @@
+# Simulates the busService object without using the D-Bus (intended for unit tests). Data usually stored in
+# D-Bus items is now stored in memory.
+class MockDbusService(object):
+    def __init__(self, servicename):
+        self._dbusobjects = {}
+        self._callbacks = {}
+        self._service_name = servicename
+
+    def add_path(self, path, value, description="", writeable=False, onchangecallback=None,
+                 gettextcallback=None):
+        self._dbusobjects[path] = value
+        if onchangecallback is not None:
+            self._callbacks[path] = onchangecallback
+
+    # Add the mandatory paths, as per victron dbus api doc
+    def add_mandatory_paths(self, processname, processversion, connection,
+            deviceinstance, productid, productname, firmwareversion, hardwareversion, connected):
+        self.add_path('/Management/ProcessName', processname)
+        self.add_path('/Management/ProcessVersion', processversion)
+        self.add_path('/Management/Connection', connection)
+
+        # Create rest of the mandatory objects
+        self.add_path('/DeviceInstance', deviceinstance)
+        self.add_path('/ProductId', productid)
+        self.add_path('/ProductName', productname)
+        self.add_path('/FirmwareVersion', firmwareversion)
+        self.add_path('/HardwareVersion', hardwareversion)
+        self.add_path('/Connected', connected)
+
+    # Simulates a SetValue from the D-Bus, if avaible the onchangecallback associated with the path will
+    # be called before the data is changed.
+    def set_value(self, path, newvalue):
+        callback = self._callbacks.get(path)
+        if callback is None or callback(path, newvalue):
+            self._dbusobjects[path] = newvalue
+
+    def __getitem__(self, path):
+        return self._dbusobjects[path]
+
+    def __setitem__(self, path, newvalue):
+        if path not in self._dbusobjects:
+            raise Exception('Path not registered in service: {}{} (use add_path to register)'.\
+                format(self._service_name, path))
+        self._dbusobjects[path] = newvalue
+
+    def __delitem__(self, path):
+        del self._dbusobjects[path]
+
+    def __contains__(self, path):
+        return path in self._dbusobjects
+
+    def __enter__(self):
+        # No batching done in mock object, and we already
+        # support the required dict interface.
+        return self
+
+    def __exit__(self, *exc):
+        pass