diff --git a/tests/src/helpers.c b/tests/src/helpers.c
index 065d17d..29b2df5 100644
--- a/tests/src/helpers.c
+++ b/tests/src/helpers.c
@@ -660,6 +660,15 @@
     return ret;
 }
 
+void mbedtls_test_print_buf(const char *title, unsigned char *buf, size_t len)
+{
+    printf("%s:", title);
+    for (size_t i = 0; i < len; i++) {
+        printf(" %02x", buf[i]);
+    }
+    printf("\n");
+}
+
 #if defined(MBEDTLS_TEST_HOOKS)
 void mbedtls_test_err_add_check(int high, int low,
                                 const char *file, int line)