diff --git a/tools/testing/selftests/hid/tests/test_tablet.py b/tools/testing/selftests/hid/tests/test_tablet.py
index 440a87170db1..f24cf2e168a4 100644
--- a/tools/testing/selftests/hid/tests/test_tablet.py
+++ b/tools/testing/selftests/hid/tests/test_tablet.py
@@ -351,6 +351,56 @@ class PenState(Enum):
             ),
         }
 
+    @staticmethod
+    def legal_transitions_with_secondary_button() -> Dict[str, Tuple["PenState", ...]]:
+        """We revisit the Windows Pen Implementation state machine:
+        we now have a secondary button.
+        Note: we don't looks for 2 buttons interactions.
+        """
+        return {
+            "hover-button": (PenState.PEN_IS_IN_RANGE_WITH_SECOND_BUTTON,),
+            "hover-button -> out-of-range": (
+                PenState.PEN_IS_IN_RANGE_WITH_SECOND_BUTTON,
+                PenState.PEN_IS_OUT_OF_RANGE,
+            ),
+            "in-range -> button-press": (
+                PenState.PEN_IS_IN_RANGE,
+                PenState.PEN_IS_IN_RANGE_WITH_SECOND_BUTTON,
+            ),
+            "in-range -> button-press -> button-release": (
+                PenState.PEN_IS_IN_RANGE,
+                PenState.PEN_IS_IN_RANGE_WITH_SECOND_BUTTON,
+                PenState.PEN_IS_IN_RANGE,
+            ),
+            "in-range -> touch -> button-press -> button-release": (
+                PenState.PEN_IS_IN_RANGE,
+                PenState.PEN_IS_IN_CONTACT,
+                PenState.PEN_IS_IN_CONTACT_WITH_SECOND_BUTTON,
+                PenState.PEN_IS_IN_CONTACT,
+            ),
+            "in-range -> touch -> button-press -> release -> button-release": (
+                PenState.PEN_IS_IN_RANGE,
+                PenState.PEN_IS_IN_CONTACT,
+                PenState.PEN_IS_IN_CONTACT_WITH_SECOND_BUTTON,
+                PenState.PEN_IS_IN_RANGE_WITH_SECOND_BUTTON,
+                PenState.PEN_IS_IN_RANGE,
+            ),
+            "in-range -> button-press -> touch -> release -> button-release": (
+                PenState.PEN_IS_IN_RANGE,
+                PenState.PEN_IS_IN_RANGE_WITH_SECOND_BUTTON,
+                PenState.PEN_IS_IN_CONTACT_WITH_SECOND_BUTTON,
+                PenState.PEN_IS_IN_RANGE_WITH_SECOND_BUTTON,
+                PenState.PEN_IS_IN_RANGE,
+            ),
+            "in-range -> button-press -> touch -> button-release -> release": (
+                PenState.PEN_IS_IN_RANGE,
+                PenState.PEN_IS_IN_RANGE_WITH_SECOND_BUTTON,
+                PenState.PEN_IS_IN_CONTACT_WITH_SECOND_BUTTON,
+                PenState.PEN_IS_IN_CONTACT,
+                PenState.PEN_IS_IN_RANGE,
+            ),
+        }
+
     @staticmethod
     def tolerated_transitions() -> Dict[str, Tuple["PenState", ...]]:
         """This is not adhering to the Windows Pen Implementation state machine
@@ -429,6 +479,7 @@ class Pen(object):
         self.width = 10
         self.height = 10
         self.barrelswitch = False
+        self.secondarybarrelswitch = False
         self.invert = False
         self.eraser = False
         self.xtilt = 1
@@ -721,6 +772,22 @@ class BaseTest:
             """Rework the transition state machine by adding the primary button."""
             self._test_states(state_list, scribble)
 
+        @pytest.mark.skip_if_uhdev(
+            lambda uhdev: "Secondary Barrel Switch" not in uhdev.fields,
+            "Device not compatible, missing Secondary Barrel Switch usage",
+        )
+        @pytest.mark.parametrize("scribble", [True, False], ids=["scribble", "static"])
+        @pytest.mark.parametrize(
+            "state_list",
+            [
+                pytest.param(v, id=k)
+                for k, v in PenState.legal_transitions_with_secondary_button().items()
+            ],
+        )
+        def test_valid_secondary_button_pen_states(self, state_list, scribble):
+            """Rework the transition state machine by adding the secondary button."""
+            self._test_states(state_list, scribble)
+
         @pytest.mark.skip_if_uhdev(
             lambda uhdev: "Invert" not in uhdev.fields,
             "Device not compatible, missing Invert usage",
