Fix garbled test output (#18822)

* Fix garbled test output

* Correct SRC listing

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/test_common/main.cpp b/tests/test_common/main.cpp
index 3e4b4c0f95..0f4e320b07 100644
--- a/tests/test_common/main.cpp
+++ b/tests/test_common/main.cpp
@@ -5,7 +5,7 @@ extern "C" {
 #include "debug.h"
 
 int8_t sendchar(uint8_t c) {
-    fprintf(stderr, "%c", c);
+    fprintf(stdout, "%c", c);
     return 0;
 }