diff --git a/.github/workflows/learn-github-actions.yml b/.github/workflows/learn-github-actions.yml
index 0e89c7d..15fa1e1 100644
--- a/.github/workflows/learn-github-actions.yml
+++ b/.github/workflows/learn-github-actions.yml
@@ -23,4 +23,4 @@ jobs:
         run: cmake --build "build_${{ matrix.build-tool }}_${{ matrix.compiler }}"
 
       - name: Test the project
-        run: ctest --test-dir "build_${{ matrix.build-tool }}_${{ matrix.compiler }}"
+        run: ctest --test-dir "build_${{ matrix.build-tool }}_${{ matrix.compiler }}/tests"
diff --git a/.gitignore b/.gitignore
index af96791..c975984 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 .vscode
 build
+Testing
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 73bc446..967cbd6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -11,8 +11,10 @@ set(CMAKE_CXX_STANDARD_REQUIRED TRUE)
 
 include_directories(${PROJECT_SOURCE_DIR}/include)
 
-# Create sources variable
-file(GLOB_RECURSE SOURCES "src/*.cpp")
-message("Sources: ${SOURCES}")
+add_executable(hello
+    src/low/low.cpp
+    src/mid/mid.cpp
+    src/main.cpp
+)
 
-add_executable(hello ${SOURCES})
+add_subdirectory(tests)
diff --git a/Makefile b/Makefile
index 116e769..7bfefc2 100644
--- a/Makefile
+++ b/Makefile
@@ -4,8 +4,11 @@ build:
 	cmake -S . -B build -G Ninja
 	cmake --build build
 
-run: build
+test: build
+	ctest --test-dir build/tests
+
+run: test
 	./build/hello
 
 clean:
-	rm -rf build
+	rm -rf build Testing
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
new file mode 100644
index 0000000..5781690
--- /dev/null
+++ b/tests/CMakeLists.txt
@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 3.22)
+project(HelloTests)
+
+include(FetchContent)
+FetchContent_Declare(
+  googletest
+  URL https://github.com/google/googletest/archive/03597a01ee50ed33e9dfd640b249b4be3799d395.zip
+)
+FetchContent_MakeAvailable(googletest)
+
+add_executable(HelloTests
+    low/test_low.cpp
+    ../src/low/low.cpp
+)
+target_link_libraries(HelloTests gtest_main)
+
+enable_testing()
+
+add_test(NAME HelloTests COMMAND HelloTests)
diff --git a/tests/low/test_low.cpp b/tests/low/test_low.cpp
new file mode 100644
index 0000000..0920e34
--- /dev/null
+++ b/tests/low/test_low.cpp
@@ -0,0 +1,8 @@
+#include <gtest/gtest.h>
+
+#include "low/low.h"
+
+TEST(LowTestSuite, MessageTest) {
+  std::string result = message();
+  EXPECT_EQ(result, "Hello!");
+}