diff --git a/tests/dynamics/test_dynamics.py b/tests/dynamics/test_dynamics.py
index f763b8bb3..c1282700c 100644
--- a/tests/dynamics/test_dynamics.py
+++ b/tests/dynamics/test_dynamics.py
@@ -35,6 +35,18 @@ def test_max_angular_momentum(self):
             (1, sp.Eq(angular_momentum, 0)),
             (2 * z / (z + 1), sp.Eq(angular_momentum, 1)),
         )
+        BlattWeisskopfSquared.max_angular_momentum = None
+
+    def test_unevaluated_expression(self):
+        z = sp.Symbol("z")
+        ff1 = BlattWeisskopfSquared(z, angular_momentum=1)
+        ff2 = BlattWeisskopfSquared(z, angular_momentum=2)
+        assert ff1.max_angular_momentum is None
+        assert ff2.max_angular_momentum is None
+        BlattWeisskopfSquared.max_angular_momentum = 3
+        assert ff1.max_angular_momentum is 3  # noqa: F632
+        assert ff2.max_angular_momentum is 3  # noqa: F632
+        BlattWeisskopfSquared.max_angular_momentum = None
 
 
 class TestEnergyDependentWidth: