diff --git a/tests/test_bridge.py b/tests/test_bridge.py
new file mode 100644
index 0000000..90ae811
--- /dev/null
+++ b/tests/test_bridge.py
@@ -0,0 +1,10 @@
+from gridguard_secure_attested_cross_domain_e.bridge import EnergiBridge
+
+
+def test_energi_bridge_roundtrip():
+    local = {"asset_id": "substation-1", "objective": {"dispatch": 5}}
+    canonical = EnergiBridge.to_canonical(local)
+    restored = EnergiBridge.from_canonical(canonical)
+    assert isinstance(restored, dict)
+    assert "LocalProblems" in restored
+    assert restored["LocalProblems"][0] == local