diff --git a/.gitea/workflows/unit-tests-host.yaml b/.gitea/workflows/unit-tests-host.yaml
new file mode 100644
index 0000000..26357e5
--- /dev/null
+++ b/.gitea/workflows/unit-tests-host.yaml
@@ -0,0 +1,22 @@
+name: Run unit tests on host
+on:
+  push:
+
+jobs:
+  Run-Unit-Tests:
+    runs-on: ubuntu-22.04-full
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Build and test
+        run: |
+          cmake software -B build
+          cmake --build build
+          ctest --test-dir build
+      - name: Upload test report
+        uses: actions/upload-artifact@v3
+        with:
+          name: junit-xml
+          path: build/junit.xml
+        # Use always() to always run this step to publish test results when there are test failures
+        if: ${{ always() }}
diff --git a/software/CMakeLists.txt b/software/CMakeLists.txt
index 703612a..1e23f9b 100644
--- a/software/CMakeLists.txt
+++ b/software/CMakeLists.txt
@@ -1,12 +1,60 @@
-cmake_minimum_required(VERSION 3.14)
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2024 Matthias Blankertz <matthias@blankertz.org>
 
-project(tonberry-pico)
+cmake_minimum_required(VERSION 3.29)
+project(tonberry-pico LANGUAGES C)
+
+include(FetchContent)
+FetchContent_Declare(unity
+    GIT_REPOSITORY https://github.com/ThrowTheSwitch/Unity.git
+    GIT_TAG v2.6.0
+)
+FetchContent_MakeAvailable(unity)
+include(CTest)
+function(make_unity_test )
+    set(options "")
+    set(oneValueArgs NAME TEST_SOURCE)
+    set(multiValueArgs SOURCES INCLUDES)
+    cmake_parse_arguments(PARSE_ARGV 0 MAKE_UNITY_TEST
+        "${options}" "${oneValueArgs}" "${multiValueArgs}"
+    )
+
+    add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${MAKE_UNITY_TEST_NAME}_runner.c
+        COMMAND ${unity_SOURCE_DIR}/auto/generate_test_runner.rb ${MAKE_UNITY_TEST_TEST_SOURCE} ${CMAKE_CURRENT_BINARY_DIR}/${MAKE_UNITY_TEST_NAME}_runner.c
+        DEPENDS ${MAKE_UNITY_TEST_TEST_SOURCE}
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+    )
+
+    add_executable(${MAKE_UNITY_TEST_NAME}
+        ${MAKE_UNITY_TEST_TEST_SOURCE}
+        ${MAKE_UNITY_TEST_SOURCES}
+        ${CMAKE_CURRENT_BINARY_DIR}/${MAKE_UNITY_TEST_NAME}_runner.c
+    )
+    target_link_libraries(${MAKE_UNITY_TEST_NAME} PUBLIC unity::framework)
+    target_include_directories(${MAKE_UNITY_TEST_NAME}
+        PRIVATE ${MAKE_UNITY_TEST_INCLUDES})
+
+    add_test(NAME ${MAKE_UNITY_TEST_NAME}
+        COMMAND sh -c "$<TARGET_FILE:${MAKE_UNITY_TEST_NAME}> > ${PROJECT_BINARY_DIR}/reports/${MAKE_UNITY_TEST_NAME}.testresults"
+    )
+    set_tests_properties(${MAKE_UNITY_TEST_NAME} PROPERTIES FIXTURES_REQUIRED Report)
+endfunction()
+
+add_test(NAME clean-reports
+    COMMAND sh -c "rm -rf ${PROJECT_BINARY_DIR}/reports; mkdir ${PROJECT_BINARY_DIR}/reports"
+)
+add_test(NAME generate-xml-report
+    COMMAND  ${unity_SOURCE_DIR}/auto/stylize_as_junit.rb -r ${PROJECT_BINARY_DIR}/reports/ -o junit.xml
+)
+set_tests_properties(clean-reports PROPERTIES FIXTURES_SETUP "Report")
+set_tests_properties(generate-xml-report PROPERTIES FIXTURES_CLEANUP "Report")
+
+add_subdirectory(src/audiocore)
 
 add_custom_target(check-format
     find . -iname '*.[ch]' -exec clang-format -Werror --dry-run {} +
     WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/src
 )
-
 add_custom_target(clang-format
     find . -iname '*.[ch]' -exec clang-format -i {} +
     WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/src
diff --git a/software/src/audiocore/CMakeLists.txt b/software/src/audiocore/CMakeLists.txt
new file mode 100644
index 0000000..508a913
--- /dev/null
+++ b/software/src/audiocore/CMakeLists.txt
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2024 Matthias Blankertz <matthias@blankertz.org>
+
+make_unity_test(NAME test_audiocore
+    TEST_SOURCE test/test_audiocore.c
+    SOURCES audiocore.c
+    INCLUDES "${CMAKE_CURRENT_SOURCE_DIR}/../test/include" "${CMAKE_CURRENT_SOURCE_DIR}"
+)
diff --git a/software/src/audiocore/audiocore.h b/software/src/audiocore/audiocore.h
index 6ff31f3..7079e53 100644
--- a/software/src/audiocore/audiocore.h
+++ b/software/src/audiocore/audiocore.h
@@ -5,6 +5,7 @@
 
 #include <hardware/sync.h>
 
+#include <stdint.h>
 #include <string.h>
 
 /* Access rules
diff --git a/software/src/audiocore/test/test_audiocore.c b/software/src/audiocore/test/test_audiocore.c
new file mode 100644
index 0000000..e80eafe
--- /dev/null
+++ b/software/src/audiocore/test/test_audiocore.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2024 Matthias Blankertz <matthias@blankertz.org>
+
+#include "audiocore.h"
+#include "i2s.h"
+
+#include "unity.h"
+
+struct audiocore_shared_context shared_context;
+
+bool i2s_init(int out_pin, int sideset_base, int samplerate) {}
+
+void i2s_deinit(void) {}
+
+void multicore_fifo_push_blocking(unsigned val) {}
+
+unsigned multicore_fifo_pop_blocking(void) {}
+
+void test_something(void) { TEST_ASSERT_TRUE(1); }
diff --git a/software/src/test/include/hardware/sync.h b/software/src/test/include/hardware/sync.h
new file mode 100644
index 0000000..b8228c1
--- /dev/null
+++ b/software/src/test/include/hardware/sync.h
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2024 Matthias Blankertz <matthias@blankertz.org>
+
+#pragma once
+
+struct spin_lock;
+typedef struct spin_lock spin_lock_t;
+
+void multicore_fifo_push_blocking(unsigned val);
+unsigned multicore_fifo_pop_blocking(void);
diff --git a/software/src/test/include/py/mperrno.h b/software/src/test/include/py/mperrno.h
new file mode 100644
index 0000000..60a4e6d
--- /dev/null
+++ b/software/src/test/include/py/mperrno.h
@@ -0,0 +1,5 @@
+#pragma once
+
+#include <errno.h>
+
+#define MP_EIO EIO