diff --git a/bin/CMakeLists.txt b/bin/CMakeLists.txt
index d66b144..9fd306f 100644
--- a/bin/CMakeLists.txt
+++ b/bin/CMakeLists.txt
@@ -1,3 +1,5 @@
 add_executable(${PROJECT_NAME} main.cpp)
 
+target_link_libraries(${PROJECT_NAME} PUBLIC mylib)
+
 target_include_directories(${PROJECT_NAME} PUBLIC ${PROJECT_SOURCE_DIR})
\ No newline at end of file
diff --git a/bin/main.cpp b/bin/main.cpp
index 0ab7f9b..53149f9 100644
--- a/bin/main.cpp
+++ b/bin/main.cpp
@@ -1,6 +1,9 @@
 #include <iostream>
 
+#include "lib/mylib/MyClass.h"
+
 int main() {
-  std::cout << "Hello, World!" << std::endl;
+  MyClass printer(std::cout);
+  printer.Print("Hello, World!");
   return 0;
 }
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 40bcb59..a2e0e27 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -13,3 +13,5 @@ else ()
 endif()
 
 message(STATUS "Build type: ${CMAKE_BUILD_TYPE}")
+
+add_subdirectory(mylib)
diff --git a/lib/mylib/CMakeLists.txt b/lib/mylib/CMakeLists.txt
new file mode 100644
index 0000000..4c59bc5
--- /dev/null
+++ b/lib/mylib/CMakeLists.txt
@@ -0,0 +1 @@
+add_library(mylib STATIC MyClass.cpp MyClass.h)
\ No newline at end of file
diff --git a/lib/mylib/MyClass.cpp b/lib/mylib/MyClass.cpp
new file mode 100644
index 0000000..c4f920a
--- /dev/null
+++ b/lib/mylib/MyClass.cpp
@@ -0,0 +1,7 @@
+#include "MyClass.h"
+
+MyClass::MyClass(std::ostream& out) : out_(out) {}
+
+void MyClass::Print(const std::string& str) {
+    out_ << str;
+}
diff --git a/lib/mylib/MyClass.h b/lib/mylib/MyClass.h
new file mode 100644
index 0000000..e536fa6
--- /dev/null
+++ b/lib/mylib/MyClass.h
@@ -0,0 +1,16 @@
+#ifndef MYCLASS_H_
+#define MYCLASS_H_
+
+#include <iostream>
+
+class MyClass {
+ public:
+  explicit MyClass(std::ostream& out);
+
+  void Print(const std::string& str);
+
+ private:
+  std::ostream& out_;
+};
+
+#endif //MYCLASS_H_
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 7353d0c..4c62957 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -19,6 +19,7 @@ add_executable(
 
 target_link_libraries(
         ${PROJECT_NAME}_tests # link used libraries from lib directory
+        mylib
         GTest::gtest_main
 )
 
diff --git a/tests/main_test.cpp b/tests/main_test.cpp
index 04a7cd8..105243a 100644
--- a/tests/main_test.cpp
+++ b/tests/main_test.cpp
@@ -1,6 +1,7 @@
 #include <sstream>
 
 #include <gtest/gtest.h> // include your library here
+#include "lib/mylib/MyClass.h"
 
 std::vector<std::string> SplitString(const std::string& str) {
   std::istringstream iss(str);
@@ -8,8 +9,9 @@ std::vector<std::string> SplitString(const std::string& str) {
   return {std::istream_iterator<std::string>(iss), std::istream_iterator<std::string>()};
 }
 
-TEST(BasicTestSuite, BasicTest1) {
+TEST(MyLibUnitTestSuite, BasicTest1) {
   std::ostringstream out;
-  out << "Hello, World!";
+  MyClass printer(out);
+  printer.Print("Hello, World!");
   ASSERT_EQ(out.str(), "Hello, World!");
 }