diff --git a/src/test/java/com/example/demo/RoleServiceTest.java b/src/test/java/com/example/demo/RoleServiceTest.java
new file mode 100644
index 0000000..4507ad4
--- /dev/null
+++ b/src/test/java/com/example/demo/RoleServiceTest.java
@@ -0,0 +1,49 @@
+package com.example.demo;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@SpringBootTest
+class RoleServiceTest {
+
+    @Autowired
+    private RoleService roleService;
+
+    @Test
+    void getRoleName_returnsAdministratorForAdmin() {
+        assertEquals("Administrator", roleService.getRoleName("ADMIN"));
+    }
+
+    @Test
+    void getRoleName_returnsDeveloperForDeveloper() {
+        assertEquals("Developer", roleService.getRoleName("DEVELOPER"));
+    }
+
+    @Test
+    void getRoleName_returnsUnknownForNull() {
+        assertEquals("UNKNOWN", roleService.getRoleName(null));
+    }
+
+    @Test
+    void getRoleName_returnsUnknownForBlank() {
+        assertEquals("UNKNOWN", roleService.getRoleName("  "));
+    }
+
+    @Test
+    void isValidRole_returnsTrueForValidRoles() {
+        assertTrue(roleService.isValidRole("ADMIN"));
+        assertTrue(roleService.isValidRole("DEVELOPER"));
+        assertTrue(roleService.isValidRole("ROLE_VIEWER"));
+    }
+
+    @Test
+    void isValidRole_returnsFalseForInvalidRoles() {
+        assertFalse(roleService.isValidRole(null));
+        assertFalse(roleService.isValidRole(""));
+        assertFalse(roleService.isValidRole("admin"));
+        assertFalse(roleService.isValidRole("ADMIN123"));
+    }
+}