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/qmp-input-visitor.h"
  14 #include "qapi/qmp-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     QmpOutputVisitor *qov;
  41     QmpInputVisitor *qiv;
  42
  43     /*
  44      * Most tests of interactions between QObject and visitors are in
  45      * test-qmp-*-visitor; but these tests live here because they
  46      * depend on layering violations to check qnull_ refcnt.
  47      */
  48
  49     g_assert(qnull_.refcnt == 1);
  50     obj = qnull();
  51     qiv = qmp_input_visitor_new(obj, true);
  52     qobject_decref(obj);
  53     visit_type_null(qmp_input_get_visitor(qiv), NULL, &error_abort);
  54     qmp_input_visitor_cleanup(qiv);
  55
  56     qov = qmp_output_visitor_new();
  57     visit_type_null(qmp_output_get_visitor(qov), NULL, &error_abort);
  58     obj = qmp_output_get_qobject(qov);
  59     g_assert(obj == &qnull_);
  60     qobject_decref(obj);
  61     qmp_output_visitor_cleanup(qov);
  62
  63     g_assert(qnull_.refcnt == 1);
  64 }
  65
  66 int main(int argc, char **argv)
  67 {
  68     g_test_init(&argc, &argv, NULL);
  69
  70     g_test_add_func("/public/qnull_ref", qnull_ref_test);
  71     g_test_add_func("/public/qnull_visit", qnull_visit_test);
  72
  73     return g_test_run();
  74 }