tests: add test for sys/delay

tests/sys/delay/Makefile

@@ -0,0 +1,13 @@
+include ../Makefile.sys_common
+
+LOW_POWER ?= 0
+
+ifeq (1,$(LOW_POWER))
+  USEMODULE += ztimer_msec
+else
+  USEMODULE += ztimer_usec
+endif
+
+USEMODULE += delay_us_spinning
+
+include $(RIOTBASE)/Makefile.include

tests/sys/delay/main.c

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+/*
+ * Copyright (C) 2023 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 the sys/delay
+ *
+ * @author      Marian Buschsieweke <marian.buschsieweke@ovgu.de>
+ *
+ * @}
+ */
+
+#include <assert.h>
+#include <stdio.h>
+
+#include "delay.h"
+#include "irq.h"
+#include "led.h"
+
+int main(void)
+{
+    printf(
+        "Test Application for sys/delay\n"
+        "==============================\n"
+        "\n"
+    );
+
+    printf("Delay: 1 s\n");
+    delay_s(1);
+    printf("Done\n");
+    printf("Delay: 100 ms\n");
+    delay_ms(100);
+    printf("Done\n");
+
+    printf("Now blinking LED with a 100 μs pulse every 100 ms\n");
+    while (1) {
+        unsigned state = irq_disable();
+        LED0_ON;
+        delay_us_spinning(100);
+        LED0_OFF;
+        irq_restore(state);
+        delay_ms(100);
+    }
+    return 0;
+}

tests/sys/delay/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
+import time
+from testrunner import run
+
+
+def testfunc(child):
+    child.expect("Test Application for sys/delay")
+    child.expect(r"Delay: (\d+) s")
+    start = time.time()
+    expected = int(child.match.group(1))
+    child.expect("Done")
+    elapsed = time.time() - start
+    assert elapsed > expected
+
+    child.expect(r"Delay: (\d+) ms")
+    start = time.time()
+    expected = int(child.match.group(1))
+    child.expect("Done")
+    elapsed = time.time() - start
+    assert elapsed > expected / 1000
+
+
+if __name__ == "__main__":
+    sys.exit(run(testfunc))