cyclic: Add a simple test

Add a test for cyclic function registration and activation.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

test/common/Makefile

@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0+
 obj-y += cmd_ut_common.o
 obj-$(CONFIG_AUTOBOOT) += test_autoboot.o
+obj-$(CONFIG_CYCLIC) += cyclic.o
 obj-$(CONFIG_EVENT) += event.o

test/common/cyclic.c

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2022 Stefan Roese <sr@denx.de>
+ */
+
+#include <common.h>
+#include <cyclic.h>
+#include <dm.h>
+#include <test/common.h>
+#include <test/test.h>
+#include <test/ut.h>
+#include <watchdog.h>
+#include <linux/delay.h>
+
+/* Test that cyclic function is called */
+static bool cyclic_active = false;
+
+static void cyclic_test(void *ctx)
+{
+	cyclic_active = true;
+}
+
+static int dm_test_cyclic_running(struct unit_test_state *uts)
+{
+	cyclic_active = false;
+	ut_assertnonnull(cyclic_register(cyclic_test, 10 * 1000, "cyclic_demo",
+					 NULL));
+
+	/* Execute all registered cyclic functions */
+	WATCHDOG_RESET();
+	ut_asserteq(true, cyclic_active);
+
+	return 0;
+}
+COMMON_TEST(dm_test_cyclic_running, 0);