tests: zbus: add channel name test suite

Add tests to verify the zbus_chan_from_name() functionality

Signed-off-by: Trond F. Christiansen <trond.christiansen@nordicsemi.no>

tests/subsys/zbus/channel_name/CMakeLists.txt

@@ -0,0 +1,13 @@
+#
+# Copyright (c) 2025 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(test_channel_name)
+
+FILE(GLOB app_sources src/main.c)
+target_sources(app PRIVATE ${app_sources})

tests/subsys/zbus/channel_name/prj.conf

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+#
+# Copyright (c) 2025 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+CONFIG_ZTEST=y
+CONFIG_ASSERT=y
+CONFIG_LOG=y
+CONFIG_ZBUS=y
+CONFIG_ZBUS_CHANNEL_NAME=y

tests/subsys/zbus/channel_name/src/main.c

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+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/zbus/zbus.h>
+#include <zephyr/ztest.h>
+#include <zephyr/ztest_assert.h>
+#include <zephyr/sys/util_macro.h>
+
+struct msg {
+	int x;
+};
+
+#define CHANNEL_COUNT 10
+
+#define DEFINE_TEST_CHANNELS(i, _)                                                                 \
+	ZBUS_CHAN_DEFINE(test_chan_##i, struct msg, NULL, NULL, ZBUS_OBSERVERS_EMPTY,              \
+			 ZBUS_MSG_INIT(0));
+
+LISTIFY(CHANNEL_COUNT, DEFINE_TEST_CHANNELS, (;))
+
+ZTEST(channel_name, test_channel_retrieval)
+{
+	/* invalid cases */
+	zexpect_is_null(zbus_chan_from_name("unknown"));
+	zexpect_is_null(zbus_chan_from_name(NULL));
+	zexpect_is_null(zbus_chan_from_name(""));
+
+	/* valid cases */
+	zexpect_equal_ptr(&test_chan_0, zbus_chan_from_name("test_chan_0"));
+	zexpect_equal_ptr(&test_chan_4, zbus_chan_from_name("test_chan_4"));
+	zexpect_equal_ptr(&test_chan_5, zbus_chan_from_name("test_chan_5"));
+	zexpect_equal_ptr(&test_chan_9, zbus_chan_from_name("test_chan_9"));
+}
+
+ZTEST_SUITE(channel_name, NULL, NULL, NULL, NULL, NULL);

tests/subsys/zbus/channel_name/testcase.yaml

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+tests:
+  message_bus.zbus.channel_name:
+    tags: zbus
+    integration_platforms:
+      - native_sim