modified the test cases

src/test/java/com/nisum/offertransactionservice/controller/OfferControllerTest.java

 package com.nisum.offertransactionservice.controller;
 
-import com.nisum.offertransactionservice.dto.EndOfSaleReq;
-import com.nisum.offertransactionservice.dto.Item;
-import com.nisum.offertransactionservice.dto.OfferTransactionRequest;
-import com.nisum.offertransactionservice.dto.OfferTransactionResponse;
+import com.nisum.offertransactionservice.dto.*;
 import com.nisum.offertransactionservice.model.*;
 import com.nisum.offertransactionservice.service.EndOfSaleService;
 import com.nisum.offertransactionservice.service.EndOfTransactionService;
@@ -15,8 +12,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.mockito.*;
 import org.mockito.junit.MockitoJUnitRunner;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.boot.test.mock.mockito.MockBean;
+
 
 import java.io.IOException;
 import java.util.ArrayList;
@@ -56,8 +52,8 @@ public class OfferControllerTest {
     @Test
     public void endOfSaleTest() throws IOException {
         Mockito.when(endOfSaleService.putEndofSaleResInDb(getEndOfSaleReq())).thenReturn(UUID.randomUUID().toString());
-        String uuid = offerTransactionController.endOfSale(getEndOfSaleReq());
-        Assert.assertNotNull(uuid);
+        EndOfSaleResponse response = offerTransactionController.endOfSale(getEndOfSaleReq());
+        Assert.assertNotNull(response);
     }
 
     @Test