diff --git a/CMakeLists.txt b/CMakeLists.txt
index e3ff4be..3df4917 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,20 +3,36 @@ set(PROJECT_NAME "to-dos-api")
 project(${PROJECT_NAME} CXX)
 
 file(GLOB_RECURSE sources CONFIGURE_DEPENDS 
-  ${CMAKE_SOURCE_DIR}/src/*.cpp
+  ${CMAKE_SOURCE_DIR}/src/*/*.cpp
   ${CMAKE_SOURCE_DIR}/src/data/models/odb-gen/*.cxx
 )
 
-add_executable(${PROJECT_NAME} ${sources})
-target_include_directories(${PROJECT_NAME} PRIVATE
-${CMAKE_SOURCE_DIR}/src
-/usr/include
-src/data/models/
-)
+set(PROJECT_OBJECTS ${PROJECT_NAME}_lib)
+
+add_library(${PROJECT_OBJECTS} OBJECT ${sources})
 
-target_link_libraries(${PROJECT_NAME} PRIVATE odb odb-pgsql)
+target_include_directories(${PROJECT_OBJECTS} PUBLIC
+  ${CMAKE_SOURCE_DIR}/src
+  /usr/include
+  src/data/models/
+)
 
 find_package(Drogon REQUIRED)
-target_link_libraries(${PROJECT_NAME} PRIVATE Drogon::Drogon)
 find_package(jsoncpp REQUIRED)
-target_link_libraries(${PROJECT_NAME} PRIVATE JsonCpp::JsonCpp)
\ No newline at end of file
+
+target_link_libraries(${PROJECT_OBJECTS} PUBLIC 
+  Drogon::Drogon
+  JsonCpp::JsonCpp
+  odb odb-pgsql
+)
+
+add_executable(${PROJECT_NAME} 
+  ${CMAKE_SOURCE_DIR}/src/main.cpp
+  $<TARGET_OBJECTS:${PROJECT_OBJECTS}>
+)
+
+target_link_libraries(${PROJECT_NAME} PUBLIC 
+  ${PROJECT_OBJECTS}
+)
+
+add_subdirectory(test)
diff --git a/README.md b/README.md
index d88f327..5a4f0e4 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,17 @@ To run clang-tidy, run the following command:
 find ./src -name "*.cpp" -not -path "*/build/*" -exec echo "Checking {}..." \; -exec clang-tidy --config-file=.clang-tidy {} -- -I./include -std=c++20 \;
 ```
 
+## Tests run
+
+The project presents an example of test implementation using GTest tools. Test files are located in the `test` directory at the root of the project. Inside the `test` directory there is a `CMakeLists.txt` file created specifically for building a separate executable file for tests.
+
+### How to run tests
+
+To run tests, go to the `build/Debug` directory, and then run the `ctest` command in the terminal (`Ctrl + Shift + ~`).
+
+Alternatively, use the CMake Tools Extension in VS Code. To do this, open the CMake Tools Extension and click `Test`, after configuring and building the project.
+<p style="text-align: center;"><img src="docs/images/cmakeTests.png" alt="cmakeTests" width="400"/></p>
+
 ## Working with ORM+Migration.
 
 ### ORM:
diff --git a/conanfile.py b/conanfile.py
index 99bfcea..0307e98 100644
--- a/conanfile.py
+++ b/conanfile.py
@@ -44,3 +44,4 @@ def package(self):
     
     def requirements(self):
         self.requires("drogon/1.9.10")
+        self.requires("gtest/1.14.0")
diff --git a/docs/images/cmakeTests.png b/docs/images/cmakeTests.png
new file mode 100644
index 0000000..1b9a10c
Binary files /dev/null and b/docs/images/cmakeTests.png differ
diff --git a/docs/technologies.md b/docs/technologies.md
index 3268860..faabec3 100644
--- a/docs/technologies.md
+++ b/docs/technologies.md
@@ -113,7 +113,6 @@ At the time of research, the following versions were used:
 | Availability of a suitable ORM | -                          | (not studied due to exclusion) | -                                  |
 | Presence of migrations         | -                          | (not studied due to exclusion) | -                                  |
 
-
 #### Why Drogon - Chosen solution
 
 **Advantages:**
@@ -190,5 +189,4 @@ Final decision: manage migrations with SQLAlchemy/Alembic and use ODB for C++ da
 - Implement and maintain C++ data access with ODB on PostgreSQL.
 - Coordination workflow: apply Alembic migrations first, then synchronize ODB mappings/models and the C++ data access code to reflect schema updates.
 
-
 ## E2E Tests
\ No newline at end of file
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 0000000..f8c1bfd
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1,22 @@
+enable_testing()
+
+include(GoogleTest)
+
+set(TEST_PROJECT ${PROJECT_NAME}_unit_tests)
+
+file(GLOB_RECURSE test_sources CONFIGURE_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp)
+
+add_executable(${TEST_PROJECT} ${test_sources})
+
+find_package(GTest REQUIRED)
+
+target_link_libraries(${TEST_PROJECT} PRIVATE 
+  ${PROJECT_OBJECTS}
+  GTest::gtest
+)
+
+target_include_directories(${TEST_PROJECT} PRIVATE
+  ${CMAKE_SOURCE_DIR}/src
+)
+
+gtest_discover_tests(${TEST_PROJECT})
\ No newline at end of file
diff --git a/test/addition-operation.cpp b/test/addition-operation.cpp
new file mode 100644
index 0000000..50489ed
--- /dev/null
+++ b/test/addition-operation.cpp
@@ -0,0 +1,6 @@
+#include "addition-operation.h"
+
+int AdditionOperation(int a, int b)
+{
+    return a + b;
+}
\ No newline at end of file
diff --git a/test/addition-operation.h b/test/addition-operation.h
new file mode 100644
index 0000000..844dd78
--- /dev/null
+++ b/test/addition-operation.h
@@ -0,0 +1,3 @@
+#pragma once
+
+int AdditionOperation(int a, int b);
\ No newline at end of file
diff --git a/test/test_main.cpp b/test/test_main.cpp
new file mode 100644
index 0000000..341c9ed
--- /dev/null
+++ b/test/test_main.cpp
@@ -0,0 +1,19 @@
+#include "addition-operation.h"
+#include "gtest/gtest.h"
+
+// Testing reference section in GTest documentation
+// https://google.github.io/googletest/reference/testing.html
+TEST(MathTest, AdditionOperation)
+{   
+    // Assertions section in GTest documentation
+    // https://google.github.io/googletest/reference/assertions.html#EXPECT_EQ
+    EXPECT_EQ(AdditionOperation(2, 3), 5);
+    EXPECT_EQ(AdditionOperation(-1, 1), 0);
+}
+
+int main(int argc, char** argv)
+{
+    ::testing::InitGoogleTest(&argc, argv);
+
+    return RUN_ALL_TESTS();
+}
\ No newline at end of file