diff --git a/tests/unit/test_expression_tree/test_operations/test_convert_to_casadi.py b/tests/unit/test_expression_tree/test_operations/test_convert_to_casadi.py
index 0ebdb31ebf..fa9992ad24 100644
--- a/tests/unit/test_expression_tree/test_operations/test_convert_to_casadi.py
+++ b/tests/unit/test_expression_tree/test_operations/test_convert_to_casadi.py
@@ -66,9 +66,11 @@ def test_convert_array_symbols(self):
 
         casadi_t = casadi.MX.sym("t")
         casadi_y = casadi.MX.sym("y", 10)
+        casadi_y_dot = casadi.MX.sym("y_dot", 10)
 
         pybamm_t = pybamm.Time()
         pybamm_y = pybamm.StateVector(slice(0, 10))
+        pybamm_y_dot = pybamm.StateVectorDot(slice(0, 10))
 
         # Time
         self.assertEqual(pybamm_t.to_casadi(casadi_t, casadi_y), casadi_t)
@@ -76,6 +78,12 @@ def test_convert_array_symbols(self):
         # State Vector
         self.assert_casadi_equal(pybamm_y.to_casadi(casadi_t, casadi_y), casadi_y)
 
+        # State Vector Dot
+        self.assert_casadi_equal(
+            pybamm_y_dot.to_casadi(casadi_t, casadi_y, casadi_y_dot),
+            casadi_y_dot
+        )
+
     def test_special_functions(self):
         a = pybamm.Array(np.array([1, 2, 3, 4, 5]))
         self.assert_casadi_equal(pybamm.max(a).to_casadi(), casadi.MX(5), evalf=True)