diff --git a/tests/lean/run/cc_ac_support.lean b/tests/lean/run/cc_ac_support.lean
new file mode 100644
index 0000000000..fcbef5aef0
--- /dev/null
+++ b/tests/lean/run/cc_ac_support.lean
@@ -0,0 +1,7 @@
+open tactic
+
+example (a b c : nat) (f : nat → nat) : f (a + b + c) = f (c + b + a) :=
+by cc
+
+example (a b c : nat) (f : nat → nat) : a + b = c → f (c + c) = f (a + b + c) :=
+by cc