diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7c4eeaf..64eef2b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,6 @@ set(CMAKE_CXX_STANDARD 26)
 
 find_package(ftxui CONFIG REQUIRED)
 
-add_executable(uno-game src/main.cpp)
 add_executable(uno-game src/main.cpp
         src/game/Card.cpp
         src/game/CardTile.cpp
@@ -15,4 +14,11 @@ target_link_libraries(uno-game
         PRIVATE ftxui::screen
         PRIVATE ftxui::dom
         PRIVATE ftxui::component
-)
\ No newline at end of file
+)
+
+add_library(uno-game-lib src/game/Card.cpp
+        src/game/CardTile.cpp
+        src/common/utils.cpp
+)
+
+add_subdirectory(test)
\ No newline at end of file
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
new file mode 100644
index 0000000..9c631bf
--- /dev/null
+++ b/test/CMakeLists.txt
@@ -0,0 +1,19 @@
+cmake_minimum_required(VERSION 4.0)
+find_package(GTest REQUIRED)
+
+set(CMAKE_CXX_STANDARD 26)
+
+project(uno-game-test)
+
+add_executable(uno-game-test unit/game/CardTest.cpp)
+
+target_link_libraries(uno-game-test
+        PUBLIC uno-game-lib
+)
+target_link_libraries(uno-game-test
+        PRIVATE GTest::gtest
+        PRIVATE GTest::gtest_main
+)
+
+include(GoogleTest)
+gtest_discover_tests(uno-game-test)
diff --git a/test/unit/game/CardTest.cpp b/test/unit/game/CardTest.cpp
new file mode 100644
index 0000000..6e764e4
--- /dev/null
+++ b/test/unit/game/CardTest.cpp
@@ -0,0 +1,63 @@
+/**
+ * @file 
+ *
+ * @author Yuzhe Guo
+ * @date 2025.11.15
+ */
+
+#include "gtest/gtest.h"
+#include "../../../src/game/Card.h"
+
+TEST(card_test, card_test_1)
+{
+    const UNO::GAME::Card card(UNO::GAME::CardColor::RED, UNO::GAME::CardType::NUM0);
+
+    EXPECT_EQ(card.getColor(), UNO::GAME::CardColor::RED);
+    EXPECT_EQ(card.getType(), UNO::GAME::CardType::NUM0);
+    EXPECT_EQ(card.colorToString(), std::string("Red"));
+    EXPECT_EQ(card.typeToString(), std::string("0"));
+    EXPECT_EQ(card.toString(), std::string("Red 0"));
+}
+
+TEST(card_test, card_test_2)
+{
+    const UNO::GAME::Card card(UNO::GAME::CardColor::BLUE, UNO::GAME::CardType::REVERSE);
+
+    EXPECT_EQ(card.getColor(), UNO::GAME::CardColor::BLUE);
+    EXPECT_EQ(card.getType(), UNO::GAME::CardType::REVERSE);
+    EXPECT_EQ(card.colorToString(), std::string("Blue"));
+    EXPECT_EQ(card.typeToString(), std::string("Reverse"));
+    EXPECT_EQ(card.toString(), std::string("Blue Reverse"));
+}
+
+TEST(card_test, card_test_3)
+{
+    const UNO::GAME::Card card(UNO::GAME::CardColor::WILD, UNO::GAME::CardType::WILD);
+
+    EXPECT_EQ(card.getColor(), UNO::GAME::CardColor::WILD);
+    EXPECT_EQ(card.getType(), UNO::GAME::CardType::WILD);
+    EXPECT_EQ(card.colorToString(), std::string("Wild"));
+    EXPECT_EQ(card.typeToString(), std::string("Wild"));
+    EXPECT_EQ(card.toString(), std::string("Wild"));
+}
+
+TEST(card_test, card_test_4)
+{
+    const UNO::GAME::Card card(UNO::GAME::CardColor::WILD, UNO::GAME::CardType::WILDDRAWFOUR);
+
+    EXPECT_EQ(card.getColor(), UNO::GAME::CardColor::WILD);
+    EXPECT_EQ(card.getType(), UNO::GAME::CardType::WILDDRAWFOUR);
+    EXPECT_EQ(card.colorToString(), std::string("Wild"));
+    EXPECT_EQ(card.typeToString(), std::string("Wild Draw 4"));
+    EXPECT_EQ(card.toString(), std::string("Wild Draw 4"));
+}
+
+TEST(card_test, card_test_5)
+{
+    EXPECT_THROW(UNO::GAME::Card(UNO::GAME::CardColor::WILD, UNO::GAME::CardType::NUM0), std::invalid_argument);
+}
+
+TEST(card_test, card_test_6)
+{
+    EXPECT_THROW(UNO::GAME::Card(UNO::GAME::CardColor::RED, UNO::GAME::CardType::WILD), std::invalid_argument);
+}
\ No newline at end of file