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/* Self tests for gdb::observers, GDB notifications to observers.
Copyright (C) 2003-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "gdbsupport/selftest.h"
#include "gdbsupport/observable.h"
namespace selftests {
namespace observers {
static gdb::observers::observable<int> test_notification ("test_notification");
static int test_first_observer = 0;
static int test_second_observer = 0;
static int test_third_observer = 0;
static void
test_first_notification_function (int arg)
{
test_first_observer++;
}
static void
test_second_notification_function (int arg)
{
test_second_observer++;
}
static void
test_third_notification_function (int arg)
{
test_third_observer++;
}
static void
notify_check_counters (int one, int two, int three)
{
/* Reset. */
test_first_observer = 0;
test_second_observer = 0;
test_third_observer = 0;
/* Notify. */
test_notification.notify (0);
/* Check. */
SELF_CHECK (one == test_first_observer);
SELF_CHECK (two == test_second_observer);
SELF_CHECK (three == test_third_observer);
}
static void
run_tests ()
{
/* First, try sending a notification without any observer
attached. */
notify_check_counters (0, 0, 0);
const gdb::observers::token token1 {}, token2 {} , token3 {};
/* Now, attach one observer, and send a notification. */
test_notification.attach (&test_second_notification_function, token2);
notify_check_counters (0, 1, 0);
/* Remove the observer, and send a notification. */
test_notification.detach (token2);
notify_check_counters (0, 0, 0);
/* With a new observer. */
test_notification.attach (&test_first_notification_function, token1);
notify_check_counters (1, 0, 0);
/* With 2 observers. */
test_notification.attach (&test_second_notification_function, token2);
notify_check_counters (1, 1, 0);
/* With 3 observers. */
test_notification.attach (&test_third_notification_function, token3);
notify_check_counters (1, 1, 1);
/* Remove middle observer. */
test_notification.detach (token2);
notify_check_counters (1, 0, 1);
/* Remove first observer. */
test_notification.detach (token1);
notify_check_counters (0, 0, 1);
/* Remove last observer. */
test_notification.detach (token3);
notify_check_counters (0, 0, 0);
/* Go back to 3 observers, and remove them in a different
order... */
test_notification.attach (&test_first_notification_function, token1);
test_notification.attach (&test_second_notification_function, token2);
test_notification.attach (&test_third_notification_function, token3);
notify_check_counters (1, 1, 1);
/* Remove the third observer. */
test_notification.detach (token3);
notify_check_counters (1, 1, 0);
/* Remove the second observer. */
test_notification.detach (token2);
notify_check_counters (1, 0, 0);
/* Remove first observer, no more observers. */
test_notification.detach (token1);
notify_check_counters (0, 0, 0);
}
} /* namespace observers */
} /* namespace selftests */
void _initialize_observer_selftest ();
void
_initialize_observer_selftest ()
{
selftests::register_test ("gdb::observers",
selftests::observers::run_tests);
}
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