diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 76ac9aa..6ebfb08 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -35,6 +35,38 @@ jobs:
       - name: "Stop Gradle"
         working-directory: ./backend
         run: gradle --stop
+  
+  test:
+    name: "Test"
+    runs-on: "vps-4"
+    container:
+      image: "cimg/openjdk:22.0-node"
+    steps:
+      - name: "Checkout"
+        uses: actions/checkout@v3
+      - name: Setup Java 22
+        uses: actions/setup-java@v3
+        with:
+          distribution: "temurin"
+          java-version: "22"
+      - name: "Cache Gradle dependencies"
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: gradle-${{ runner.os }}-common
+          restore-keys: |
+            gradle-${{ runner.os }}-
+      - name: "Prepare Gradle"
+        working-directory: ./backend
+        run: gradle clean
+      - name: "Test"
+        working-directory: ./backend
+        run: gradle test
+      - name: "Stop Gradle"
+        working-directory: ./backend
+        run: gradle --stop
 
   eslint:
     name: eslint
diff --git a/backend/src/test/java/de/szut/casino/health/HealthControllerTest.java b/backend/src/test/java/de/szut/casino/health/HealthControllerTest.java
new file mode 100644
index 0000000..1214c7a
--- /dev/null
+++ b/backend/src/test/java/de/szut/casino/health/HealthControllerTest.java
@@ -0,0 +1,26 @@
+package de.szut.casino.health;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.test.web.servlet.MockMvc;
+
+@WebMvcTest(HealthController.class)
+@AutoConfigureMockMvc(addFilters = false)
+public class HealthControllerTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    void healthCheckReturnsUpStatus() throws Exception {
+        mockMvc.perform(get("/health"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.status").value("UP"));
+    }
+}
\ No newline at end of file
diff --git a/backend/src/test/java/de/szut/casino/user/UserControllerTest.java b/backend/src/test/java/de/szut/casino/user/UserControllerTest.java
new file mode 100644
index 0000000..2addb43
--- /dev/null
+++ b/backend/src/test/java/de/szut/casino/user/UserControllerTest.java
@@ -0,0 +1,122 @@
+package de.szut.casino.user;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.header;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
+import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import de.szut.casino.user.dto.CreateUserDto;
+import de.szut.casino.user.dto.GetUserDto;
+
+@WebMvcTest(UserController.class)
+@AutoConfigureMockMvc(addFilters = false)
+public class UserControllerTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Autowired
+    private ObjectMapper objectMapper;
+
+    @MockBean
+    private UserService userService;
+
+    private GetUserDto getUserDto;
+    private CreateUserDto createUserDto;
+    private UserEntity testUser;
+    private final String TEST_ID = "test-id-123";
+    private final String AUTH_TOKEN = "Bearer test-token";
+
+    @BeforeEach
+    void setUp() {
+        getUserDto = new GetUserDto();
+        getUserDto.setKeycloakId(TEST_ID);
+        getUserDto.setUsername("testuser");
+
+        testUser = new UserEntity();
+        testUser.setKeycloakId(TEST_ID);
+        testUser.setUsername("testuser");
+
+        createUserDto = new CreateUserDto();
+        createUserDto.setKeycloakId(TEST_ID);
+        createUserDto.setUsername("testuser");
+    }
+
+    @Test
+    void getUserByIdSuccess() throws Exception {
+        when(userService.exists(TEST_ID)).thenReturn(true);
+        when(userService.getUser(TEST_ID)).thenReturn(getUserDto);
+
+        mockMvc.perform(get("/user/" + TEST_ID))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.keycloakId").value(TEST_ID))
+                .andExpect(jsonPath("$.username").value("testuser"));
+    }
+
+    @Test
+    void getUserByIdNotFound() throws Exception {
+        when(userService.exists(TEST_ID)).thenReturn(false);
+
+        mockMvc.perform(get("/user/" + TEST_ID))
+                .andExpect(status().isNotFound());
+    }
+
+    @Test
+    void createUserSuccess() throws Exception {
+        when(userService.exists(TEST_ID)).thenReturn(false);
+        when(userService.createUser(any(CreateUserDto.class))).thenReturn(testUser);
+
+        mockMvc.perform(post("/user")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(createUserDto)))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.keycloakId").value(TEST_ID))
+                .andExpect(jsonPath("$.username").value("testuser"));
+    }
+
+    @Test
+    void createUserAlreadyExists() throws Exception {
+        when(userService.exists(TEST_ID)).thenReturn(true);
+
+        mockMvc.perform(post("/user")
+                        .contentType(MediaType.APPLICATION_JSON)
+                        .content(objectMapper.writeValueAsString(createUserDto)))
+                .andExpect(status().isFound())
+                .andExpect(header().string("Location", "/user/" + TEST_ID));
+    }
+
+    @Test
+    void getCurrentUserSuccess() throws Exception {
+        when(userService.getCurrentUser(AUTH_TOKEN)).thenReturn(getUserDto);
+
+        mockMvc.perform(get("/user")
+                        .header("Authorization", AUTH_TOKEN))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.keycloakId").value(TEST_ID))
+                .andExpect(jsonPath("$.username").value("testuser"));
+    }
+
+    @Test
+    void getCurrentUserNotFound() throws Exception {
+        when(userService.getCurrentUser(anyString())).thenReturn(null);
+
+        mockMvc.perform(get("/user")
+                        .header("Authorization", AUTH_TOKEN))
+                .andExpect(status().isNotFound());
+    }
+}
\ No newline at end of file