Fixed upb_string error with strange vsnprintf() behavior.

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/test_string.c b/tests/test_string.c
index 5869b70..46f35b9 100644
--- a/tests/test_string.c
+++ b/tests/test_string.c
@@ -32,6 +32,7 @@ int main() {
 
   // Make string alias part of another string.
   str2 = upb_strdupc("WXYZ");
+  str = upb_string_tryrecycle(str);
   upb_string_substr(str, str2, 1, 2);
   assert(upb_string_len(str) == 2);
   assert(upb_string_len(str2) == 4);
@@ -63,9 +64,17 @@ int main() {
   // Test printf.
   str = upb_string_tryrecycle(str);
   upb_string_printf(str, "Number: %d, String: %s", 5, "YO!");
+  assert(upb_streqlc(str, "Number: 5, String: YO!"));
+
+  // Test asprintf
+  upb_string *str3 = upb_string_asprintf("Yo %s: " UPB_STRFMT "\n",
+                                         "Josh", UPB_STRARG(str));
+  const char expected[] = "Yo Josh: Number: 5, String: YO!\n";
+  assert(upb_streqlc(str3, expected));
 
   upb_string_unref(str);
   upb_string_unref(str2);
+  upb_string_unref(str3);
 
   // Unref of NULL is harmless.
   upb_string_unref(NULL);