Use session dbus for udisks2 tests (#4194)

* Use session dbus for udisks2 tests

* Don't redefine type

tests/dbus_service_mocks/udisks2_loop.py

@@ -0,0 +1,48 @@
+"""Mock of UDisks2 Loop service."""
+
+from dbus_fast.service import PropertyAccess, dbus_property
+
+from .base import DBusServiceMock, dbus_method
+
+BUS_NAME = "org.freedesktop.UDisks2"
+
+
+def setup(object_path: str | None = None) -> DBusServiceMock:
+    """Create dbus mock object."""
+    return Loop()
+
+
+# pylint: disable=invalid-name
+
+
+class Loop(DBusServiceMock):
+    """Loop mock.
+
+    gdbus introspect --system --dest org.freedesktop.UDisks2 --object-path /org/freedesktop/UDisks2/block_devices/loop0
+    """
+
+    interface = "org.freedesktop.UDisks2.Loop"
+    object_path = "/org/freedesktop/UDisks2/block_devices/loop0"
+
+    @dbus_property(access=PropertyAccess.READ)
+    def BackingFile(self) -> "ay":
+        """Get BackingFile."""
+        return b""
+
+    @dbus_property(access=PropertyAccess.READ)
+    def Autoclear(self) -> "b":
+        """Get Autoclear."""
+        return False
+
+    @dbus_property(access=PropertyAccess.READ)
+    def SetupByUID(self) -> "u":
+        """Get SetupByUID."""
+        return 0
+
+    @dbus_method()
+    def Delete(self, options: "a{sv}") -> None:
+        """Do Delete method."""
+
+    @dbus_method()
+    def SetAutoClear(self, value: "b", options: "a{sv}") -> None:
+        """Do SetAutoClear method."""