diff --git a/tests/core/acc.cc b/tests/core/acc.cc
index 74c32fa49..608e8c40f 100644
--- a/tests/core/acc.cc
+++ b/tests/core/acc.cc
@@ -237,5 +237,9 @@ int main()
       expect(e, "Too many acceptance sets used.");
     }
 
+  auto cond1 =  spot::acc_cond::acc_code(
+    "(Inf(0) & Inf(5)) | Inf(5) | Inf(0)");
+  std::cout << cond1.unit_propagation() << '\n';
+
   return 0;
 }
diff --git a/tests/core/acc.test b/tests/core/acc.test
index ad7f80578..af1d0ac0a 100755
--- a/tests/core/acc.test
+++ b/tests/core/acc.test
@@ -85,6 +85,7 @@ Fin(2) | Inf(2)
 Inf(2) & Fin(2)
 (Fin(0)|Fin(3)) | (Inf(1) & Fin(2))
 (Fin(0)|Fin(3)) | (Inf(1) & Fin(2))
+Inf(5) | Inf(0)
 EOF
 
 run 0 ../acc > stdout