add test cases for `trap` ... but disabled for now until trap support is committed
diff --git a/shell/hush_test/hush-trap/exit.right b/shell/hush_test/hush-trap/exit.right
new file mode 100644
index 0000000..b4932fb
--- /dev/null
+++ b/shell/hush_test/hush-trap/exit.right
@@ -0,0 +1,2 @@
+cow
+moo