Added unit tests to cmake

CMakeLists.txt

@@ -1,6 +1,7 @@
 cmake_minimum_required (VERSION 3.5)
 
 option(EXAMPLES "Build examples and tiny_loopback" OFF)
+option(UNITTEST "Build unit tests" OFF)
 
 file(GLOB_RECURSE SOURCE_FILES src/*.cpp src/*.c)
 file(GLOB_RECURSE HEADER_FILES src/*.h)
@@ -19,6 +20,10 @@ if (NOT DEFINED COMPONENT_DIR)
         add_subdirectory(examples/linux/hdlc_demo_multithread)
     endif()
 
+    if (UNITTEST)
+        add_subdirectory(unittest)
+    endif()
+
 else()
 
     idf_component_register(SRCS ${SOURCE_FILES}

unittest/CMakeLists.txt

@@ -0,0 +1,32 @@
+cmake_minimum_required (VERSION 3.5)
+
+file(GLOB_RECURSE SOURCE_FILES *.cpp *.c)
+
+if (NOT DEFINED COMPONENT_DIR)
+
+    project (unit_test)
+
+    add_executable(unit_test ${SOURCE_FILES})
+
+    target_link_libraries(unit_test tinyproto)
+
+    find_package(Threads REQUIRED)
+    target_link_libraries(${PROJECT_NAME} Threads::Threads)
+    find_package(CppUTest QUIET)
+    if (NOT CppUTest_FOUND)
+        find_package(PkgConfig REQUIRED)
+        pkg_search_module(CPPUTEST cpputest REQUIRED)
+        target_link_libraries(${PROJECT_NAME} ${CPPUTEST_LIBRARIES})
+    else()
+        target_link_libraries(${PROJECT_NAME} CppUTest::CppUTest)
+    endif()
+
+
+    add_custom_target(check unit_test)
+
+else()
+
+    idf_component_register(SRCS ${SOURCE_FILES}
+                           INCLUDE_DIRS ".")
+
+endif()