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
  11 #include "qapi/qmp/qobject.h"
  12 #include "qemu-common.h"
  13 #include "qapi/qobject-input-visitor.h"
  14 #include "qapi/qobject-output-visitor.h"
  15 #include "qapi/error.h"
  16
  17 /*
  18  * Public Interface test-cases
  19  *
  20  * (with some violations to access 'private' data)
  21  */
  22
  23 static void qnull_ref_test(void)
  24 {
  25     QObject *obj;
  26
  27     g_assert(qnull_.refcnt == 1);
  28     obj = qnull();
  29     g_assert(obj);
  30     g_assert(obj == &qnull_);
  31     g_assert(qnull_.refcnt == 2);
  32     g_assert(qobject_type(obj) == QTYPE_QNULL);
  33     qobject_decref(obj);
  34     g_assert(qnull_.refcnt == 1);
  35 }
  36
  37 static void qnull_visit_test(void)
  38 {
  39     QObject *obj;
  40     Visitor *v;
  41
  42     /*
  43      * Most tests of interactions between QObject and visitors are in
  44      * test-qmp-*-visitor; but these tests live here because they
  45      * depend on layering violations to check qnull_ refcnt.
  46      */
  47
  48     g_assert(qnull_.refcnt == 1);
  49     obj = qnull();
  50     v = qobject_input_visitor_new(obj);
  51     qobject_decref(obj);
  52     visit_type_null(v, NULL, &error_abort);
  53     visit_free(v);
  54
  55     v = qobject_output_visitor_new(&obj);
  56     visit_type_null(v, NULL, &error_abort);
  57     visit_complete(v, &obj);
  58     g_assert(obj == &qnull_);
  59     qobject_decref(obj);
  60     visit_free(v);
  61
  62     g_assert(qnull_.refcnt == 1);
  63 }
  64
  65 int main(int argc, char **argv)
  66 {
  67     g_test_init(&argc, &argv, NULL);
  68
  69     g_test_add_func("/public/qnull_ref", qnull_ref_test);
  70     g_test_add_func("/public/qnull_visit", qnull_visit_test);
  71
  72     return g_test_run();
  73 }