tests/check-qnull.c

   1 /*
   2  * QNull unit-tests.
   3  *
   4  * Copyright (C) 2016 Red Hat Inc.
   5  *
   6  * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
   7  * See the COPYING.LIB file in the top-level directory.
   8  */
   9 #include "qemu/osdep.h"
  10 #include <glib.h>
  11
  12 #include "qapi/qmp/qobject.h"
  13 #include "qemu-common.h"
  14 #include "qapi/qmp-input-visitor.h"
  15 #include "qapi/qmp-output-visitor.h"
  16 #include "qapi/error.h"
  17
  18 /*
  19  * Public Interface test-cases
  20  *
  21  * (with some violations to access 'private' data)
  22  */
  23
  24 static void qnull_ref_test(void)
  25 {
  26     QObject *obj;
  27
  28     g_assert(qnull_.refcnt == 1);
  29     obj = qnull();
  30     g_assert(obj);
  31     g_assert(obj == &qnull_);
  32     g_assert(qnull_.refcnt == 2);
  33     g_assert(qobject_type(obj) == QTYPE_QNULL);
  34     qobject_decref(obj);
  35     g_assert(qnull_.refcnt == 1);
  36 }
  37
  38 static void qnull_visit_test(void)
  39 {
  40     QObject *obj;
  41     QmpOutputVisitor *qov;
  42     QmpInputVisitor *qiv;
  43
  44     /*
  45      * Most tests of interactions between QObject and visitors are in
  46      * test-qmp-*-visitor; but these tests live here because they
  47      * depend on layering violations to check qnull_ refcnt.
  48      */
  49
  50     g_assert(qnull_.refcnt == 1);
  51     obj = qnull();
  52     qiv = qmp_input_visitor_new(obj, true);
  53     qobject_decref(obj);
  54     visit_type_null(qmp_input_get_visitor(qiv), NULL, &error_abort);
  55     qmp_input_visitor_cleanup(qiv);
  56
  57     qov = qmp_output_visitor_new();
  58     visit_type_null(qmp_output_get_visitor(qov), NULL, &error_abort);
  59     obj = qmp_output_get_qobject(qov);
  60     g_assert(obj == &qnull_);
  61     qobject_decref(obj);
  62     qmp_output_visitor_cleanup(qov);
  63
  64     g_assert(qnull_.refcnt == 1);
  65 }
  66
  67 int main(int argc, char **argv)
  68 {
  69     g_test_init(&argc, &argv, NULL);
  70
  71     g_test_add_func("/public/qnull_ref", qnull_ref_test);
  72     g_test_add_func("/public/qnull_visit", qnull_visit_test);
  73
  74     return g_test_run();
  75 }