diff --git a/test/test_buffer.c b/test/test_buffer.c
index 7151f52..416eadd 100644
--- a/test/test_buffer.c
+++ b/test/test_buffer.c
@@ -11,6 +11,7 @@ START_TEST (test_new_gbuf)
     fail_if(buf->ref_cnt != 1);
     fail_if(buf->buf == NULL);
     fail_if(buf->used != 0);
+    uc_gbuf_unref(buf);
 
 END_TEST
 
@@ -26,6 +27,7 @@ START_TEST (test_gbuf_grow)
     fail_if(rc != 0);
     fail_if(buf->len < 128 + 33);
     fail_if(buf->used != 0);
+    uc_gbuf_unref(buf);
 
 END_TEST
 
@@ -40,6 +42,7 @@ START_TEST (test_gbuf_append1)
     fail_if(rc != 0);
     fail_if(buf->used != strlen(data) + 1);
     fail_if(strcmp(data, buf->buf) != 0);
+    uc_gbuf_unref(buf);
 
 END_TEST
 
@@ -53,6 +56,7 @@ START_TEST (test_gbuf_printf1)
     fail_if(rc != 6, "rc was %d", rc);
     fail_if(buf->used != 6, "buf->used was %d", buf->used);
     fail_if(strcmp("test 1", buf->buf) != 0);
+    uc_gbuf_unref(buf);
 
 END_TEST
 
@@ -66,6 +70,27 @@ START_TEST (test_gbuf_printf2)
     fail_if(rc != 20, "rc was %d", rc);
     fail_if(buf->used != 20, "buf->used was %d", buf->used);
     fail_if(strcmp("test 1 test 2 test 3", buf->buf) != 0);
+    uc_gbuf_unref(buf);
+
+END_TEST
+
+START_TEST (test_gbuf_printf3)
+    int rc;
+    GBuf *buf = uc_new_gbuf(8);
+
+    fail_if(buf == NULL);
+
+    rc = uc_gbuf_printf(buf, "test %d test %d test %d", 1, 2, 3);
+    fail_if(rc != 20, "rc was %d", rc);
+    fail_if(buf->used != 20, "buf->used was %d", buf->used);
+    fail_if(strcmp("test 1 test 2 test 3", buf->buf) != 0);
+
+    rc = uc_gbuf_printf(buf, " test %d test %d", 4, 5);
+
+    fail_if(rc != 14, "rc was %d", rc);
+    fail_if(buf->used != 34, "buf->used was %d", buf->used);
+    fail_if(strcmp("test 1 test 2 test 3 test 4 test 5", buf->buf) != 0);
+    uc_gbuf_unref(buf);
 
 END_TEST
 
@@ -92,6 +117,7 @@ Suite *buffer_suite(void)
     tcase_add_test(tc, test_gbuf_grow);
     tcase_add_test(tc, test_gbuf_printf1);
     tcase_add_test(tc, test_gbuf_printf2);
+    tcase_add_test(tc, test_gbuf_printf3);
     tcase_add_test(tc, test_gbuf_printf_empty_string);
 
     suite_add_tcase(s, tc);