diff --git a/tests_dir/fake_union.fail b/tests_dir/fake_union.fail
new file mode 100644
index 0000000..6d73276
--- /dev/null
+++ b/tests_dir/fake_union.fail
@@ -0,0 +1 @@
+ρ name➡n,age➡a(σTrue(people)) ᑌ ρ age➡a,name➡n(people)