diff --git a/src/test/java/com/developer/DeveloperServiceTest.java b/src/test/java/com/developer/DeveloperServiceTest.java
new file mode 100644
index 0000000..967e26a
--- /dev/null
+++ b/src/test/java/com/developer/DeveloperServiceTest.java
@@ -0,0 +1,45 @@
+package com.developer;
+
+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 DeveloperServiceTest {
+
+    @Autowired
+    private DeveloperService developerService;
+
+    @Test
+    void getRole_returnsDeveloper() {
+        assertEquals("developer", developerService.getRole());
+    }
+
+    @Test
+    void greet_withName_returnsPersonalizedGreeting() {
+        assertEquals("Hello, Alice!", developerService.greet("Alice"));
+    }
+
+    @Test
+    void greet_withNullOrBlank_returnsDefaultGreeting() {
+        assertEquals("Hello, Developer!", developerService.greet(null));
+        assertEquals("Hello, Developer!", developerService.greet(""));
+        assertEquals("Hello, Developer!", developerService.greet("   "));
+    }
+
+    @Test
+    void isValidRole_withDeveloper_returnsTrue() {
+        assertTrue(developerService.isValidRole("developer"));
+        assertTrue(developerService.isValidRole("DEVELOPER"));
+        assertTrue(developerService.isValidRole("Developer"));
+    }
+
+    @Test
+    void isValidRole_withOtherRole_returnsFalse() {
+        assertFalse(developerService.isValidRole("admin"));
+        assertFalse(developerService.isValidRole("user"));
+        assertFalse(developerService.isValidRole(null));
+    }
+}