diff --git a/.gitignore b/.gitignore
index c4f0d1e..3394524 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 
 build/*
+Testing/*
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7f62281..3c3321f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 
-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.23)
 
 project(maiden)
 
@@ -8,18 +8,40 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 set(CMAKE_INSTALL_PREFIX ${PROJECT_SOURCE_DIR})
 
+# gtest
+include(FetchContent)
+FetchContent_Declare(
+    googletest
+    GIT_REPOSITORY https://github.com/google/googletest.git
+    GIT_TAG        v1.17.x  # Use a specific version tag or commit hash
+)
+FetchContent_MakeAvailable(googletest)
+
 # add_subdirectory() to nest CMakeLists
 
 add_executable(maiden
+    src/App.cpp
     src/main.cpp
     # include extra source files here
 )
 
+add_executable(maiden_test
+    src/App.cpp
+    test/TestApp.cpp
+)
+
 target_include_directories(maiden PRIVATE
     "${CMAKE_CURRENT_SOURCE_DIR}/src"
     # add additional include directories here
 )
 
-target_link_libraries(maiden PRIVATE
-    # add libraries here
+target_include_directories(maiden_test PRIVATE
+    "${CMAKE_CURRENT_SOURCE_DIR}/src"
 )
+
+target_link_libraries(maiden_test PRIVATE
+    GTest::gmock_main
+)
+
+include(GoogleTest)
+gtest_discover_tests(maiden_test)
diff --git a/src/App.cpp b/src/App.cpp
new file mode 100644
index 0000000..0026493
--- /dev/null
+++ b/src/App.cpp
@@ -0,0 +1,18 @@
+
+#include "App.hpp"
+
+void App::run() {
+
+    std::cout << "im an app and im running !!" << std::endl;
+
+    (void)foo();
+
+    return;
+
+}
+
+int32_t App::foo() {
+
+    return 12;
+
+}
diff --git a/src/App.hpp b/src/App.hpp
new file mode 100644
index 0000000..500db8c
--- /dev/null
+++ b/src/App.hpp
@@ -0,0 +1,19 @@
+
+#pragma once
+
+#include <iostream>
+#include <cstdint>
+
+class App {
+
+    public:
+    App() = default;
+    ~App() = default;
+
+    void run();
+
+    private:
+
+    int32_t foo();
+
+};
diff --git a/src/main.cpp b/src/main.cpp
index 6e7b57f..80dab38 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,9 +1,14 @@
 
 #include <iostream>
 
+#include "App.hpp"
+
 int main(int argc, char** argv) {
 
     std::cout << "hi mom !" << std::endl;
 
+    App app;
+    app.run();
+
     return 0;
 }
diff --git a/test/TestApp.cpp b/test/TestApp.cpp
new file mode 100644
index 0000000..65159fa
--- /dev/null
+++ b/test/TestApp.cpp
@@ -0,0 +1,36 @@
+
+#include <gmock/gmock.h>
+#include <memory>
+
+#define private public
+#include <App.hpp>
+#undef private
+
+class TestApp : public testing::Test {
+
+    protected:
+
+    void createUut() {
+        uut_ = std::make_unique<App>();
+    }
+
+    std::unique_ptr<App> uut_;
+
+};
+
+TEST_F(TestApp, TestApp_run_nominal) {
+
+    createUut();
+    uut_->run();
+
+    // no expect here
+
+} 
+
+TEST_F(TestApp, TestApp_foo_nominal) {
+
+    createUut();
+
+    EXPECT_EQ(uut_->foo(), 12);
+
+}