diff --git a/src/test/java/com/example/e2eminimax/service/MinimaxServiceTest.java b/src/test/java/com/example/e2eminimax/service/MinimaxServiceTest.java
new file mode 100644
index 0000000..31dcdbb
--- /dev/null
+++ b/src/test/java/com/example/e2eminimax/service/MinimaxServiceTest.java
@@ -0,0 +1,47 @@
+package com.example.e2eminimax.service;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class MinimaxServiceTest {
+
+    private MinimaxService minimaxService;
+
+    @BeforeEach
+    void setUp() {
+        minimaxService = new MinimaxService();
+    }
+
+    @Test
+    void processRequest_ValidInput_ReturnsProcessedString() {
+        String result = minimaxService.processRequest("test input");
+        assertEquals("Processed: test input", result);
+    }
+
+    @Test
+    void processRequest_NullInput_ThrowsException() {
+        assertThrows(IllegalArgumentException.class, () -> minimaxService.processRequest(null));
+    }
+
+    @Test
+    void processRequest_BlankInput_ThrowsException() {
+        assertThrows(IllegalArgumentException.class, () -> minimaxService.processRequest("   "));
+    }
+
+    @Test
+    void validateInput_ValidInput_ReturnsTrue() {
+        assertTrue(minimaxService.validateInput("valid"));
+    }
+
+    @Test
+    void validateInput_NullInput_ReturnsFalse() {
+        assertFalse(minimaxService.validateInput(null));
+    }
+
+    @Test
+    void validateInput_BlankInput_ReturnsFalse() {
+        assertFalse(minimaxService.validateInput(""));
+    }
+}