From dc43bb198492da13f58cc49dfa074c406fc8551a Mon Sep 17 00:00:00 2001
From: Pablo Brubeck <brubeck@protonmail.com>
Date: Wed, 8 Jan 2025 18:14:53 +0000
Subject: [PATCH] tests

---
 test/test_form.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/test/test_form.py b/test/test_form.py
index e83abcfcf..516572c67 100755
--- a/test/test_form.py
+++ b/test/test_form.py
@@ -10,6 +10,8 @@
     SpatialCoordinate,
     TestFunction,
     TrialFunction,
+    action,
+    derivative,
     dot,
     ds,
     dx,
@@ -175,6 +177,7 @@ def test_formsum(mass):
     domain = Mesh(FiniteElement("Lagrange", triangle, 1, (2,), identity_pullback, H1))
     V = FunctionSpace(domain, element)
     v = Cofunction(V.dual())
+    u = Coefficient(V)
 
     assert v + mass
     assert mass + v
@@ -195,3 +198,10 @@ def test_formsum(mass):
     assert 2 * v
     assert isinstance(2 * v, BaseForm)
     assert (2 * v).weights()[0] == 2
+
+    f = action(-v, u)
+    df = derivative(9 * f, u)
+    assert isinstance(f, FormSum)
+    assert f.weights()[0] == -1
+    assert isinstance(df, FormSum)
+    assert df.weights()[0] == -9