Tried using google tests

.gitignore

@@ -3,3 +3,4 @@
 .vscode/c_cpp_properties.json
 .vscode/launch.json
 .vscode/ipch
+test/build/*

src/libs/CircularBuffer.h

@@ -1,4 +1,5 @@
 #include <Arduino.h>
+#include <Serial.h>
 
 enum class ErrorCode {
   SUCCESS,
@@ -29,6 +30,8 @@ public:
   }
 
   ErrorCode pushBack(const T& item) {
+    Serial.print(_count);
+    Serial.print(_capacity);
     if (_count == _capacity) {
       return ErrorCode::BUFFER_FULL;
     }

test/CMakeLists.txt

@@ -9,10 +9,11 @@ include_directories(
     ${ARDUINO_MOCK_LIBS_DIR}/lib/gtest/gtest/src/gtest/googletest/include
     ${ARDUINO_MOCK_LIBS_DIR}/lib/gtest/gtest/src/gtest/googlemock/include
 )
+message(ARDUINO_MOCK_INCLUDE_DIRS="${ARDUINO_MOCK_INCLUDE_DIRS}")
 
-file(GLOB LIB_SRCS "../*.ino")
+file(GLOB LIBS_SRCS "libs/*.cpp")
 file(GLOB SRCS "*.cpp")
-add_executable(test-all ${SRCS} ${LIB_SRCS})
+add_executable(test-all ${SRCS} ${LIBS_SRCS})
 
 target_link_libraries(test-all
     ${ARDUINO_MOCK_LIBS_DIR}/lib/gtest/gtest/src/gtest-build/googlemock/gtest/libgtest.a

test/arduino_mock/CMakeLists.txt

@@ -10,7 +10,7 @@ ExternalProject_Add(arduino_mock
 )
 
 ExternalProject_Get_Property(arduino_mock source_dir)
-set(ARDUINO_MOCK_INCLUDE_DIRS ${source_dir}/include PARENT_SCOPE)
+set(ARDUINO_MOCK_INCLUDE_DIRS ${source_dir}/include/arduino-mock PARENT_SCOPE)
 
 ExternalProject_Get_Property(arduino_mock binary_dir)
 set(ARDUINO_MOCK_LIBS_DIR ${binary_dir} PARENT_SCOPE)