Update unit test for empty strings

diff --git a/unit/test-util.c b/unit/test-util.c
index 11cd6b3..32a167e 100644 (file)
--- a/unit/test-util.c
+++ b/unit/test-util.c
@@ -188,8 +188,11 @@ static void test_invalid()
 
        res = convert_gsm_to_utf8(invalid_gsm_extended, 0, &nread, &nwritten,
                                        0);
-       g_assert(res == NULL);
+       g_assert(res);
        g_assert(nread == 0);
+       g_assert(nwritten == 0);
+       g_assert(res[0] == '\0');
+       g_free(res);
 
        res = convert_gsm_to_utf8(invalid_gsm_extended,
                                        sizeof(invalid_gsm_extended),