diff --git a/tests/test_interface.py b/tests/test_interface.py
index 49a88fc..b70c7f8 100644
--- a/tests/test_interface.py
+++ b/tests/test_interface.py
@@ -98,4 +98,12 @@ def test_hyperparam_entrypoint():
     func = utils._load_hyperparam_func("kalman.default")
     expected = 1
     result = func(None, None)
-    assert result == expected
\ No newline at end of file
+    assert result == expected
+
+
+def test_negative_axis():
+    t = np.arange(3)
+    x = np.ones((2, 3, 2))
+    axis = -2
+    dx = dxdt(x, t, kind='finite_difference', axis=axis, k=1)
+    assert x.shape == dx.shape
\ No newline at end of file