diff --git a/src/mat.rs b/src/mat.rs
index ffc2545..0b33e3e 100644
--- a/src/mat.rs
+++ b/src/mat.rs
@@ -300,4 +300,25 @@ mod test {
         // Rising from negative middle to middle
         assert_move_to_symmetric(-22.0, -110.0, 132.0, (22.0, 110.0));
     }
+
+    #[test]
+    fn mh_curve_demagnetize_across_edges() {
+        let curve = mh_curve_for_test();
+        // Falling from saturation to start
+        assert_move_to_symmetric(30.0, 150.0, 120.0, (0.0, 120.0));
+        // Falling from post-saturation to post-saturation
+        assert_move_to_symmetric(250.0, 150.0, 200.0, (50.0, 150.0));
+        // Falling from post-saturation to saturation
+        assert_move_to_symmetric(250.0, 150.0, 180.0, (30.0, 150.0));
+        // Falling from post-saturation to start
+        assert_move_to_symmetric(250.0, 150.0, 120.0, (0.0, 120.0));
+        // Falling from post-saturation to negative saturation
+        assert_move_to_symmetric(250.0, 150.0, -180.0, (-30.0, -150.0));
+        // Falling from post-saturation to negative post-saturation
+        assert_move_to_symmetric(250.0, 150.0, -400.0, (-250.0, -150.0));
+        // Falling from interior to middle
+        assert_move_to_symmetric(28.0, 130.0, 140.0, (10.0, 130.0));
+        // Falling from interior to middle
+        assert_move_to_symmetric(28.0, 130.0, 130.0, (5.0, 125.0));
+    }
 }