fix trap_stdio() call
diff --git a/typ/tester.py b/typ/tester.py
index f4dfa0a..09343b0 100644
--- a/typ/tester.py
+++ b/typ/tester.py
@@ -54,7 +54,7 @@
         args.jobs = 1
         args.pass_through = True
 
-    trap_stdio()
+    trap_stdio(args.pass_through)
     try:
       return run(args)
     finally: