Added Integration test for ModelAttribute article

spring-mvc-basics/src/test/java/com/baeldung/web/controller/EmployeeControllerModelAttributeIntegrationTest.java

@@ -0,0 +1,40 @@
+package com.baeldung.web.controller;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.model;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.view;
+
+import java.util.Arrays;
+import java.util.Collection;
+
+import org.apache.http.NameValuePair;
+import org.apache.http.client.entity.UrlEncodedFormEntity;
+import org.apache.http.message.BasicNameValuePair;
+import org.apache.http.util.EntityUtils;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+public class EmployeeControllerModelAttributeIntegrationTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    public void givenUrlEncodedFormData_whenAddEmployeeEndpointCalled_thenModelContainsMsgAttribute() throws Exception {
+        Collection<NameValuePair> formData = Arrays.asList(new BasicNameValuePair("name", "employeeName"), new BasicNameValuePair("id", "99"), new BasicNameValuePair("contactNumber", "123456789"));
+        String urlEncodedFormData = EntityUtils.toString(new UrlEncodedFormEntity(formData));
+
+        mockMvc.perform(post("/addEmployee").contentType(MediaType.APPLICATION_FORM_URLENCODED)
+            .content(urlEncodedFormData))
+            .andExpect(status().isOk())
+            .andExpect(view().name("employeeView"))
+            .andExpect(model().attribute("msg", "Welcome to the Netherlands!"));
+    }
+}