tests/event_source: add test for event sources

tests/event_source/Makefile

@@ -0,0 +1,6 @@
+include ../Makefile.tests_common
+
+USEMODULE += event_callback
+USEMODULE += event_thread
+
+include $(RIOTBASE)/Makefile.include

tests/event_source/Makefile.ci

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+BOARD_INSUFFICIENT_MEMORY := \
+    nucleo-l011k4 \
+    #

tests/event_source/main.c

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+/*
+ * Copyright (C) 2022 ML!PA Consulting GmbH
+ *
+ * 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       Event Source test application
+ *
+ * @author      Benjamin Valentin <benjamin.valentin@ml-pa.com>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+
+#include "event/callback.h"
+#include "event/source.h"
+#include "event/thread.h"
+
+static void _event_cb(void *ctx)
+{
+    puts(ctx);
+}
+
+int main(void)
+{
+    event_source_t source = EVENT_SOURCE_INIT;
+    event_callback_t a, b, c;
+
+    event_source_subscriber_t ba = EVENT_SOURCE_SUBSCRIBER_INIT(&a, EVENT_PRIO_MEDIUM);
+    event_source_subscriber_t bb = EVENT_SOURCE_SUBSCRIBER_INIT(&b, EVENT_PRIO_MEDIUM);
+    event_source_subscriber_t bc = EVENT_SOURCE_SUBSCRIBER_INIT(&c, EVENT_PRIO_MEDIUM);
+
+    event_callback_init(&a, _event_cb, "event A");
+    event_callback_init(&b, _event_cb, "event B");
+    event_callback_init(&c, _event_cb, "event C");
+
+    puts("empty event source");
+    event_source_trigger(&source);
+
+    event_source_attach(&source, &ba);
+    event_source_attach(&source, &bb);
+    event_source_attach(&source, &bc);
+
+    puts("occupied event source");
+    event_source_trigger(&source);
+
+    return 0;
+}

tests/event_source/tests/01-run.py

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+#!/usr/bin/env python3
+
+import sys
+from testrunner import run
+
+
+def testfunc(child):
+    child.expect_exact("empty event source")
+    child.expect_exact("occupied event source")
+    child.expect_exact("event C")
+    child.expect_exact("event B")
+    child.expect_exact("event A")
+
+
+if __name__ == "__main__":
+    sys.exit(run(testfunc))