tests: Add test for core_mutex/mutex_cancel

tests/mutex_cancel/Makefile

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+include ../Makefile.tests_common
+
+USEMODULE += xtimer
+
+include $(RIOTBASE)/Makefile.include

tests/mutex_cancel/main.c

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+/*
+ * Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     tests
+ * @{
+ *
+ * @file
+ * @brief       Test application for testing the mutex_cancel function in
+ *              core_mutex
+ *
+ * @author      Marian Buschsieweke <marian.buschsieweke@ovgu.de>
+ * @}
+ */
+
+#include <errno.h>
+#include <stdio.h>
+
+#include "mutex.h"
+#include "test_utils/expect.h"
+#include "thread.h"
+#include "xtimer.h"
+
+static mutex_t testlock = MUTEX_INIT;
+
+static void cb_unlock(void *mutex)
+{
+    mutex_unlock(mutex);
+}
+
+static void cb_cancel(void *mc)
+{
+    mutex_cancel(mc);
+}
+
+int main(void)
+{
+    xtimer_t xt;
+    puts(
+        "Test Application for mutex_cancel / mutex_lock_cancelable\n"
+        "=========================================================\n"
+    );
+
+    printf("%s: ", "Test without cancellation");
+    mutex_cancel_t mc = mutex_cancel_init(&testlock);
+    expect(mutex_lock_cancelable(&mc) == 0);
+    puts("OK");
+
+    printf("%s: ", "Test early cancellation");
+    mc = mutex_cancel_init(&testlock);
+    mutex_cancel(&mc);
+    expect(mutex_lock_cancelable(&mc) == -ECANCELED);
+    puts("OK");
+
+    printf("%s: ", "Verify no side effects on subsequent calls");
+    mc = mutex_cancel_init(&testlock);
+    xt.callback = cb_unlock;
+    xt.arg = &testlock;
+    xtimer_set(&xt, US_PER_MS * 10);
+    expect(mutex_lock_cancelable(&mc) == 0);
+    puts("OK");
+
+    printf("%s: ", "Test late cancellation");
+    mc = mutex_cancel_init(&testlock);
+    xt.callback = cb_cancel;
+    xt.arg = &mc;
+    xtimer_set(&xt, US_PER_MS * 10);
+    expect(mutex_lock_cancelable(&mc) == -ECANCELED);
+    puts("OK");
+
+    puts("TEST PASSED");
+
+    return 0;
+}

tests/mutex_cancel/tests/01-run.py

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+#!/usr/bin/env python3
+
+#  Copyright (C) 2020 Otto-von-Guericke-Universität Magdeburg
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+# @author      Marian Buschsieweke <marian.buschsieweke@ovgu.de>
+
+import sys
+from testrunner import run
+
+
+def testfunc(child):
+    child.expect("TEST PASSED")
+
+
+if __name__ == "__main__":
+    sys.exit(run(testfunc))