diff --git a/goodwe_controller/test_control.py b/goodwe_controller/test_control.py
index 3436d8f..ec1943b 100644
--- a/goodwe_controller/test_control.py
+++ b/goodwe_controller/test_control.py
@@ -41,15 +41,19 @@ check("proportional step (gain 0.6)", d.target_w == 300)
 d = compute(prev_w=0, grid_w=-500, actual_w=0, tuning=T)
 check("export drives charging", d.target_w == -300)
 
-# Clamp
-d = compute(prev_w=1900, grid_w=1000, actual_w=1900, tuning=Tuning(max_w=2000, slew_w=5000))
+# Clamp.
+# ⚠️ integrator_max_w is lifted clear of max_w so that the OUTPUT clamp is the
+# mechanism under test. Left at the default the integrator bound truncates
+# first, these two assertions pass on that alone, and deleting the output clamp
+# fails nothing - the same masking that hid the integrator freeze.
+TCLAMP = Tuning(max_w=2000, slew_w=5000, integrator_max_w=5000)
+d = compute(prev_w=1900, grid_w=1000, actual_w=1900, tuning=TCLAMP)
 check("clamped to max_w", d.target_w == 2000)
 
 # Slew: from 0 with a huge error, no more than slew_w in one cycle.
 d = compute(prev_w=0, grid_w=5000, actual_w=0, tuning=Tuning(max_w=5000, slew_w=1000))
 check("slew limits one cycle", d.target_w == 1000)
-d = compute(prev_w=-1900, grid_w=-1000, actual_w=-1900,
-            tuning=Tuning(max_w=2000, slew_w=5000))
+d = compute(prev_w=-1900, grid_w=-1000, actual_w=-1900, tuning=TCLAMP)
 check("clamped to -max_w", d.target_w == -2000)
 d = compute(prev_w=0, grid_w=-5000, actual_w=0, tuning=Tuning(max_w=5000, slew_w=1000))
 check("slew limits one cycle, charging", d.target_w == -1000)
@@ -132,7 +136,12 @@ check("integrator bound binds independently of the output clamp",
       d.i_w == 1000 and d.target_w == 1000)
 
 # Freeze = may not wind further in the direction it is already pushing.
-TF = Tuning(saturation_w=500, saturation_cycles=3)
+# ⚠️ max_w is raised WELL above the fixtures on purpose. At the default 2000
+# the integrator bound truncates a wound value back to exactly 2000 and
+# satisfies these assertions on its own, so deleting the freeze outright
+# failed nothing - the clamp was standing in for the mechanism under test.
+# Any fixture here must sit clear of every rail, or it tests the rail.
+TF = Tuning(saturation_w=500, saturation_cycles=3, max_w=5000)
 f1 = compute(prev_w=2000, grid_w=800, actual_w=0, tuning=TF, sat_count=3, i_w=2000.0)
 check("frozen: integration does not wind further", f1.i_w == 2000.0 and f1.frozen)
 f2 = compute(prev_w=2000, grid_w=-800, actual_w=0, tuning=TF, sat_count=3, i_w=2000.0)