test: drc: add ztest unit tests for drc module

Add native_sim Ztest coverage for two-channel DRC processing.
Cover S16, S24, and S32 pass-through and enabled configurations
through component creation, configuration, preparation, and processing.

Add the minimal SOF allocator and context support required by the
standalone test application while keeping existing CMocka tests and
production sources unchanged.

Signed-off-by: Piotr Hoppe <piotr.hoppe@intel.com>

Author: piotrhoppeintel

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

@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Copyright(c) 2026 Intel Corporation.
+
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(sof_unit_audio_drc)
+
+set(SOF_ROOT "${PROJECT_SOURCE_DIR}/../../../../../")
+set(sof_top_dir ${SOF_ROOT})
+
+# Include SOF CMake helpers used by trace source annotations.
+include(${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}/test/cmocka/include
+	${PROJECT_BINARY_DIR}/include/generated
+)
+
+target_compile_definitions(app PRIVATE
+	-DCONFIG_ZEPHYR_POSIX=1
+	-DCONFIG_LIBRARY=1
+	-DCONFIG_NUMBERS_NORM=1
+	-DUNIT_TEST=1
+)
+
+target_compile_options(app PRIVATE
+	-Wno-error=deprecated-declarations
+)
+
+target_sources(app PRIVATE
+	drc_process_ztest.c
+	drc_test_alloc.c
+	${SOF_ROOT}/src/audio/drc/drc.c
+	${SOF_ROOT}/src/audio/drc/drc_generic.c
+	${SOF_ROOT}/src/audio/drc/drc_math_generic.c
+	${SOF_ROOT}/src/audio/drc/drc_math_hifi3.c
+	${SOF_ROOT}/src/audio/drc/drc_log.c
+	${SOF_ROOT}/src/math/numbers.c
+	${SOF_ROOT}/src/math/exp_fcn.c
+	${SOF_ROOT}/src/math/exp_fcn_hifi.c
+	${SOF_ROOT}/src/math/lut_trig.c
+	${SOF_ROOT}/src/audio/module_adapter/module_adapter.c
+	${SOF_ROOT}/src/audio/module_adapter/module_adapter_ipc3.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/ipc3/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/audio/pipeline/pipeline-graph.c
+	${SOF_ROOT}/src/audio/pipeline/pipeline-params.c
+	${SOF_ROOT}/src/audio/pipeline/pipeline-schedule.c
+	${SOF_ROOT}/src/audio/pipeline/pipeline-stream.c
+	${SOF_ROOT}/src/audio/pipeline/pipeline-xrun.c
+)
+
+sof_append_relative_path_definitions(app)