Spring MVC Custom Validator

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

@@ -0,0 +1,41 @@
+package com.baeldung.web.controller;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultHandlers.print;
+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 org.junit.Before;
+import org.junit.Test;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+public class CustomMVCValidatorTest {
+    
+    private MockMvc mockMvc;
+    
+    @Before
+    public void setup(){
+        this.mockMvc = MockMvcBuilders.standaloneSetup(new ValidatedPhoneController()).build();
+    }
+    
+    @Test
+    public void givenPhonePageUri_whenMockMvc_thenReturnsPhonePage() throws Exception{
+        this.mockMvc.perform(get("/validatePhone")).andExpect(view().name("phoneHome"));
+    }
+    
+    @Test
+    public void givenPhoneURIWithPostAndFormData_whenMockMVC_thenVerifyErrorResponse() throws Exception {
+        this.mockMvc.perform(MockMvcRequestBuilders.post("/addValidatePhone").
+                accept(MediaType.TEXT_HTML).
+                param("phoneInput", "123")).
+                andExpect(model().attributeHasFieldErrorCode("validatedPhone", "phone","ContactNumberConstraint")).
+                andExpect(view().name("phoneHome")).
+                andExpect(status().isOk()).
+                andDo(print());
+    }
+    
+}