test: selector: add ztest unit tests

test/ztest/unit/audio/selector/CMakeLists.txt

@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Copyright(c) 2026 Intel Corporation.
+
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(sof_unit_audio_selector)
+
+set(SOF_ROOT "${PROJECT_SOURCE_DIR}/../../../../../")
+set(sof_top_dir ${SOF_ROOT})
+
+include(${SOF_ROOT}/scripts/cmake/misc.cmake)
+include(${SOF_ROOT}/scripts/cmake/uuid-registry.cmake)
+
+target_include_directories(app PRIVATE
+	${SOF_ROOT}/zephyr/include
+	${SOF_ROOT}/src/include
+	${SOF_ROOT}/src/platform/posix/include
+	${SOF_ROOT}/src/audio
+	${SOF_ROOT}/tools/rimage/src/include
+	${PROJECT_BINARY_DIR}/include/generated
+)
+
+target_compile_definitions(app PRIVATE
+	-DCONFIG_ZEPHYR_POSIX=1
+	-DCONFIG_LIBRARY=1
+	-DUNIT_TEST=1
+)
+
+target_sources(app PRIVATE
+	selector_ztest.c
+	selector_test_support.c
+	${SOF_ROOT}/src/audio/selector/selector.c
+	${SOF_ROOT}/src/audio/selector/selector_generic.c
+	${SOF_ROOT}/src/audio/module_adapter/module_adapter.c
+	${SOF_ROOT}/src/audio/module_adapter/module_adapter_ipc4.c
+	${SOF_ROOT}/src/audio/module_adapter/module/generic.c
+	${SOF_ROOT}/src/audio/buffers/comp_buffer.c
+	${SOF_ROOT}/src/audio/buffers/audio_buffer.c
+	${SOF_ROOT}/src/audio/source_api_helper.c
+	${SOF_ROOT}/src/audio/sink_api_helper.c
+	${SOF_ROOT}/src/audio/sink_source_utils.c
+	${SOF_ROOT}/src/audio/audio_stream.c
+	${SOF_ROOT}/src/audio/component.c
+	${SOF_ROOT}/src/audio/data_blob.c
+	${SOF_ROOT}/src/module/audio/source_api.c
+	${SOF_ROOT}/src/module/audio/sink_api.c
+	${SOF_ROOT}/src/ipc/ipc4/helper.c
+	${SOF_ROOT}/src/ipc/ipc-common.c
+	${SOF_ROOT}/src/ipc/ipc-helper.c
+	${SOF_ROOT}/src/lib/objpool.c
+	${SOF_ROOT}/src/math/numbers.c
+)
+
+# The standalone target compiles the full IPC4 helper translation unit while
+# linking only its format helpers; other helper paths leave one local ID unused.
+set_source_files_properties(
+	${SOF_ROOT}/src/ipc/ipc4/helper.c
+	PROPERTIES COMPILE_OPTIONS "-Wno-unused-variable"
+)
+
+sof_append_relative_path_definitions(app)

test/ztest/unit/audio/selector/prj.conf

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+CONFIG_ZTEST=y
+CONFIG_LOG=y
+CONFIG_SOF_FULL_ZEPHYR_APPLICATION=n
+CONFIG_LIBRARY=y
+CONFIG_IPC_MAJOR_4=y
+CONFIG_COMP_SEL=y
+CONFIG_STATIC_PIPELINE=n
+CONFIG_FORMAT_S16LE=y
+CONFIG_FORMAT_S24LE=y
+CONFIG_FORMAT_S32LE=y

test/ztest/unit/audio/selector/selector_test_support.c

@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: BSD-3-Clause
+//
+// Copyright(c) 2026 Intel Corporation.
+
+#include <rtos/alloc.h>
+#include <rtos/sof.h>
+#include <sof/audio/component_ext.h>
+#include <sof/ipc/common.h>
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+static struct sof sof_context;
+static struct ipc ipc_context;
+static bool sof_context_initialized;
+
+/**
+ * @brief Return the minimal SOF context used by selector ztests.
+ */
+struct sof *sof_get(void)
+{
+	if (!sof_context_initialized) {
+		sys_comp_init(&sof_context);
+		list_init(&ipc_context.comp_list);
+		sof_context.ipc = &ipc_context;
+		sof_context_initialized = true;
+	}
+
+	return &sof_context;
+}
+
+/**
+ * @brief Allocate aligned runtime memory for the standalone test.
+ */
+void *rmalloc_align(uint32_t flags, size_t bytes, uint32_t alignment)
+{
+	(void)flags;
+	(void)alignment;
+	return malloc(bytes);
+}
+
+/**
+ * @brief Allocate runtime memory for the standalone test.
+ */
+void *rmalloc(uint32_t flags, size_t bytes)
+{
+	(void)flags;
+	return malloc(bytes);
+}
+
+/**
+ * @brief Allocate zero-initialized runtime memory for the standalone test.
+ */
+void *rzalloc(uint32_t flags, size_t bytes)
+{
+	(void)flags;
+	return calloc(bytes, 1);
+}
+
+/**
+ * @brief Allocate aligned audio-buffer memory for the standalone test.
+ */
+void *rballoc_align(uint32_t flags, size_t bytes, uint32_t alignment)
+{
+	(void)flags;
+	(void)alignment;
+	return malloc(bytes);
+}
+
+/**
+ * @brief Release standalone runtime memory.
+ */
+void rfree(void *ptr)
+{
+	free(ptr);
+}
+
+/**
+ * @brief Allocate through the test heap abstraction.
+ */
+void *sof_heap_alloc(struct k_heap *heap, uint32_t flags, size_t bytes, size_t alignment)
+{
+	(void)heap;
+	(void)flags;
+	(void)alignment;
+	return malloc(bytes);
+}
+
+/**
+ * @brief Release memory allocated through the test heap abstraction.
+ */
+void sof_heap_free(struct k_heap *heap, void *addr)
+{
+	(void)heap;
+	free(addr);
+}
+
+/**
+ * @brief Return the absent user heap for this standalone test.
+ */
+struct k_heap *sof_sys_user_heap_get(void)
+{
+	return NULL;
+}