fix test_fgetc_ungetc

1 files changed, 3 insertions, 1 deletions

diff --git a/tests/stdio/test_fgetc_ungetc.c b/tests/stdio/test_fgetc_ungetc.c
index 15dc1543..0eea4007 100644
--- a/tests/stdio/test_fgetc_ungetc.c
+++ b/tests/stdio/test_fgetc_ungetc.c
@@ -48,7 +48,9 @@ void test() {
   ungetc('a', file);
   err = fgetc(file);
   assert(err == (int)'a');
-  fread(buffer, sizeof(char), sizeof(buffer), file);
+  int r = fread(buffer, sizeof(char), sizeof(buffer), file);
+  assert(r == 3);
+  buffer[3] = 0;
   assert(!strcmp(buffer, "bcd"));
 
   // rewind and fseek should reset anything that's been