Added Junit test case for exception scenario's

pom.xml

@@ -70,6 +70,11 @@
 			<artifactId>reactor-test</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>com.fasterxml.jackson.core</groupId>
+			<artifactId>jackson-databind</artifactId>
+			<version>2.15.2</version>
+		</dependency>
 	</dependencies>
 
 	<build>

src/main/java/com/nisum/webflux_poc/controller/EmployeeController.java

@@ -38,7 +38,7 @@ public class EmployeeController {
     @GetMapping
     public ResponseEntity<Flux<EmployeeDto>> getEmployee(){
 
-        log.info("getEmployee");
+        log.info("getEmployee details");
         return ResponseEntity.ok(employeeService.getAllEmployees());
     }
 
@@ -66,10 +66,10 @@ public class EmployeeController {
 
     }
 
-    @GetMapping("/kafka/send/{id}")
-    public ResponseEntity<Mono<EmployeeDto>> sendDataToKafkaTopic(@PathVariable String id){
-        kafkaProducerService.sendMessage(id);
-    return null;
+    @GetMapping("/kafka/send/{message}")
+    public String sendDataToKafkaTopic(@PathVariable String message){
+        return kafkaProducerService.sendMessage(message);
+
     }
 
     }

src/main/java/com/nisum/webflux_poc/model/FileUtil.java

+package com.nisum.webflux_poc.model;
+
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.stereotype.Component;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+
+@Component
+public class FileUtil {
+
+    public static String readFromFileToString(String filePath) throws IOException {
+        File resource = new ClassPathResource(filePath).getFile();
+        byte[] byteArray = Files.readAllBytes(resource.toPath());
+        return new String(byteArray);
+    }
+}

src/main/java/com/nisum/webflux_poc/service/KafkaProducerService.java

@@ -22,10 +22,10 @@ public class KafkaProducerService {
         this.kafkaTemplate = kafkaTemplate;
     }
 
-    // Sending message to a topic asynchronously and reactively
-    public void sendMessage(String message) {
+    public String sendMessage(String message) {
 
         kafkaTemplate.send(topic, message);
+        return "message sent successfully";
 
     }
 

src/main/java/com/nisum/webflux_poc/utills/AppUtils.java

 package com.nisum.webflux_poc.utills;
 
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import com.nisum.webflux_poc.model.Employee;
 import com.nisum.webflux_poc.dto.EmployeeDto;
 import org.springframework.beans.BeanUtils;
+import org.springframework.core.io.ClassPathResource;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
 
 public class AppUtils {
 
@@ -18,4 +25,20 @@ public class AppUtils {
         return employee;
     }
 
+    public static List<EmployeeDto> readFile(String filePath) throws IOException {
+        File file = new ClassPathResource(filePath).getFile();
+        ObjectMapper objectMapper = new ObjectMapper();
+        List<EmployeeDto> employeeList = objectMapper.readValue(file, new TypeReference<List<EmployeeDto>>() {});
+        return employeeList;
+
+    }
+
+    public static EmployeeDto readEmployeeFile(String filePath) throws IOException {
+        File file = new ClassPathResource(filePath).getFile();
+        ObjectMapper objectMapper = new ObjectMapper();
+        EmployeeDto employee = objectMapper.readValue(file, EmployeeDto.class);
+        return employee;
+
+    }
+
 }

src/test/java/com/nisum/webflux_poc/WebfluxPocApplicationTests.java

@@ -2,8 +2,10 @@ package com.nisum.webflux_poc;
 
 import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
 
 @SpringBootTest
+@ActiveProfiles(value = "test")
 class WebfluxPocApplicationTests {
 
 	@Test

src/test/java/com/nisum/webflux_poc/controller/EmployeeControllerTest.java

@@ -3,27 +3,37 @@ package com.nisum.webflux_poc.controller;
 import com.nisum.webflux_poc.dto.EmployeeDto;
 import com.nisum.webflux_poc.repository.EmployeeRepository;
 import com.nisum.webflux_poc.service.EmployeeService;
+import com.nisum.webflux_poc.service.KafkaProducerService;
+import com.nisum.webflux_poc.utills.AppUtils;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.Mockito;
 import org.mockito.junit.jupiter.MockitoExtension;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.test.autoconfigure.web.reactive.WebFluxTest;
 import org.springframework.boot.test.mock.mockito.MockBean;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.MediaType;
 import org.springframework.test.util.ReflectionTestUtils;
 import org.springframework.test.web.reactive.server.WebTestClient;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
+import java.io.IOException;
+import java.util.List;
+
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyString;
 import static org.mockito.Mockito.when;
 
 @ExtendWith(MockitoExtension.class)
 @WebFluxTest(EmployeeController.class)
 public class EmployeeControllerTest {
 
+
+
         @MockBean
         EmployeeService employeeService;
 
@@ -33,29 +43,29 @@ public class EmployeeControllerTest {
         @Autowired
         private WebTestClient webTestClient;
 
-        private EmployeeDto employee;
-        private EmployeeDto employee1;
+        @MockBean
+        KafkaProducerService kafkaProducerService;
 
-        @BeforeEach
-        void setUp(){
+        @Value("${spring.kafka.template.default-topic}")
+        private String topic;
 
-            employee=new EmployeeDto();
-            employee.setId("1");
-            employee.setName("manasa");
-            employee.setSalary(1234);
+        List<EmployeeDto> employeeList;
+
+        private EmployeeDto employee;
 
-            employee1=new EmployeeDto();
-            employee1.setId("2");
-            employee1.setName("asd");
-            employee1.setSalary(23456);
-            ReflectionTestUtils.setField(employeeService, "employeeRepository", employeeRepository);
+
+        @BeforeEach
+        void setUp() throws IOException {
+            employeeList = AppUtils.readFile("static/request/EmployeeList.json");
+            employee = AppUtils.readEmployeeFile("static/request/Employee.json");
+            ReflectionTestUtils.setField(kafkaProducerService,"topic",topic);
 
         }
 
         @Test
-        void saveEmployeeDataTest(){
+        void getEmployeeDataTest() throws IOException {
 
-            when(employeeService.getAllEmployees()).thenReturn(Flux.just(employee, employee1));
+            when(employeeService.getAllEmployees()).thenReturn(Flux.fromIterable(employeeList));
             webTestClient.get()
                     .uri("/employee")
                     .exchange()
@@ -64,13 +74,61 @@ public class EmployeeControllerTest {
                     .expectBodyList(EmployeeDto.class);
         }
 
+    @Test
+    void testGetEmployee_NoContent() {
+        when(employeeService.getAllEmployees())
+                .thenReturn(Flux.empty()); // Simulates failure to save
+
+        webTestClient.get()
+                .uri("/employee")
+                .exchange()
+                .expectStatus().isOk()
+                .expectBodyList(EmployeeDto.class)
+                .hasSize(0);
+    }
+
+    @Test
+    void testGetEmployee_InternalServerError() {
+        when(employeeService.getAllEmployees())
+                .thenReturn(Flux.error(new RuntimeException("Database error")));
+
+        webTestClient.get()
+                .uri("/employee")
+                .exchange()
+                .expectStatus().isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR);
+    }
+
+
+    @Test
+    void testSaveEmployee_BadRequest() {
+        when(employeeService.saveEmployeeData(any(Mono.class)))
+                .thenReturn(Mono.empty()); // Simulates failure to save
+
+        webTestClient.post()
+                .uri("/employee/save")
+                .contentType(MediaType.APPLICATION_JSON)
+                .bodyValue(employee)
+                .exchange()
+                .expectStatus().isBadRequest();
+    }
+
+    @Test
+    void testSaveEmployee_InternalServerError() {
+        when(employeeService.saveEmployeeData(any(Mono.class)))
+                .thenReturn(Mono.error(new RuntimeException("Database error"))); // Simulate error
+
+        webTestClient.post()
+                .uri("/employee/save")
+                .contentType(MediaType.APPLICATION_JSON)
+                .bodyValue(employee)
+                .exchange()
+                .expectStatus().isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR);
+    }
+
+
         @Test
     void saveEmployeeTest(){
 
-           /*EmployeeDto employee2=new EmployeeDto();
-            employee2.setId("1");
-            employee2.setName("manasa");
-            employee2.setSalary(1234);*/
 
             when(employeeService.saveEmployeeData(any(Mono.class))).thenReturn(Mono.just(employee));
             webTestClient.post()
@@ -98,7 +156,31 @@ public class EmployeeControllerTest {
     }
 
     @Test
-    void getEmployeeTest(){
+    void testUpdateEmployee_NotFound(){
+        String employeeId="1";
+        Mockito.when(employeeService.getEmployee(any(String.class))).thenReturn(Mono.empty());
+        webTestClient.put()
+                .uri("/employee/update/{id}", employeeId)
+                .contentType(MediaType.APPLICATION_JSON)
+                .bodyValue(employee)
+                .exchange()
+                .expectStatus().isOk()
+                .expectBody(Void.class);
+    }
+
+    @Test
+    void testUpdateEmployee_BadRequest(){
+        String employeeId="1";
+        Mockito.when(employeeService.getEmployee(any(String.class)))
+                .thenReturn(Mono.error(new RuntimeException("Bad request")));
+        webTestClient.put()
+                .uri("/employee/update/{id}", employeeId)
+                .contentType(MediaType.APPLICATION_JSON)
+                .exchange()
+                .expectStatus().isEqualTo(HttpStatus.BAD_REQUEST);
+    }
+    @Test
+    void getEmployeeWithIdTest(){
         String employeeId="1";
         Mono<EmployeeDto> employeeDto= Mono.just(employee);
         when(employeeService.getEmployee(employeeId)).thenReturn(employeeDto);
@@ -110,6 +192,20 @@ public class EmployeeControllerTest {
                 .expectBodyList(EmployeeDto.class);
     }
 
+    @Test
+    void testDeleteEmployee_NotFound() {
+        String employeeId = "123";
+
+        when(employeeService.deleteEmployee(employeeId))
+                .thenReturn(Mono.error(new RuntimeException("Database error"))); // Simulate error
+
+        webTestClient.delete()
+                .uri("/employee/delete/{id}", employeeId)
+                .exchange()
+                .expectStatus().isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR);
+    }
+
+
     @Test
     void deleteEmployeeTest(){
         String employeeId="1";
@@ -134,5 +230,40 @@ public class EmployeeControllerTest {
                 .expectBodyList(Double.class);
     }
 
+    @Test
+    void getAverageSalaryTestWithException(){
+        Double averageSalary= 90.9;
+        Mockito.when(employeeService.getAverageSalary()).thenReturn(Flux.error(new RuntimeException("internal server error")));
+        webTestClient.get()
+                .uri("/employee/average/salary")
+                .exchange()
+                .expectStatus()
+                .isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR);
+    }
+
+    @Test
+    void sendDataToKafkaTopicTest(){
+
+            String message = "manasa";
+        Mockito.when(kafkaProducerService.sendMessage(anyString())).thenReturn("test");
+        webTestClient.get()
+                .uri("/employee/kafka/send/{message}", message)
+                .exchange()
+                .expectStatus()
+                .is2xxSuccessful();
+    }
+
+    @Test
+    void sendDataToKafkaTopicWithException(){
+
+        String message = "manasa";
+        Mockito.when(kafkaProducerService.sendMessage(anyString())).thenThrow(new RuntimeException("internal server error"));
+        webTestClient.get()
+                .uri("/employee/kafka/send/{message}", message)
+                .exchange()
+                .expectStatus()
+                .isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR);
+    }
+
 
 }

src/test/resources/application-test.yml

+spring:
+  data:
+    mongodb:
+      database: Test
+      host: localhost
+      port: 27017
+  kafka:
+    producer:
+      bootstrap-servers: localhost:9092,localhost:9093,localhost:9094
+      key-serializer: org.apache.kafka.common.serialization.StringSerializer
+      value-serializer: org.apache.kafka.common.serialization.StringSerializer
+    template:
+      default-topic: test
+
+server:
+  port: 9292
+

src/test/resources/static/request/EmployeeList.json

+[
+  {
+    "id": "132",
+    "name": "manasa",
+    "salary": 1234.0
+  },
+  {
+    "id": "138",
+    "name": "abc",
+    "salary": 1234.0
+  }
+]
\ No newline at end of file

src/test/resources/static/request/employee.json

+{
+  "id": "132",
+  "name": "manasa",
+  "salary": 1234.0
+}
\ No newline at end of file