Enable validation in `AutoConfigureWebMvc`

Closes gh-7582

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.java

@@ -45,7 +45,7 @@ import org.springframework.validation.beanvalidation.MethodValidationPostProcess
 public class ValidationAutoConfiguration {
 
 	@Bean
-	@ConditionalOnResource(resources = "META-INF/services/javax.validation.spi.ValidationProvider")
+	@ConditionalOnResource(resources = "classpath:META-INF/services/javax.validation.spi.ValidationProvider")
 	@Conditional(OnValidatorAvailableCondition.class)
 	@ConditionalOnMissingBean
 	public MethodValidationPostProcessor methodValidationPostProcessor() {

spring-boot-test-autoconfigure/pom.xml

@@ -173,5 +173,15 @@
 			<artifactId>spring-plugin-core</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.hibernate</groupId>
+			<artifactId>hibernate-validator</artifactId>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.tomcat.embed</groupId>
+			<artifactId>tomcat-embed-el</artifactId>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 </project>

spring-boot-test-autoconfigure/src/main/resources/META-INF/spring.factories

@@ -78,6 +78,7 @@ org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration,\
 org.springframework.boot.autoconfigure.MessageSourceAutoConfiguration,\
 org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\
 org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\
+org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\
 org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration,\
 org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration
 

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/servlet/ExampleController3.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2012-2016 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.test.autoconfigure.web.servlet;
+
+import javax.validation.constraints.Size;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * Example {@link Controller} used with {@link WebMvcTest} tests.
+ *
+ * @author Stephane Nicoll
+ */
+@RestController
+@Validated
+public class ExampleController3 {
+
+	@GetMapping("/three/{id}")
+	public String three(@PathVariable @Size(max = 4) String id) {
+		return "Hello " + id;
+	}
+
+}

spring-boot-test-autoconfigure/src/test/java/org/springframework/boot/test/autoconfigure/web/servlet/WebMvcTestAllControllersIntegrationTests.java

@@ -16,13 +16,18 @@
 
 package org.springframework.boot.test.autoconfigure.web.servlet;
 
+import javax.validation.ConstraintViolationException;
+
+import org.junit.Rule;
 import org.junit.Test;
+import org.junit.rules.ExpectedException;
 import org.junit.runner.RunWith;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.MockMvc;
 
+import static org.hamcrest.CoreMatchers.isA;
 import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
@@ -31,11 +36,15 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
  * Tests for {@link WebMvcTest} when no explicit controller is defined.
  *
  * @author Phillip Webb
+ * @author Stephane Nicoll
  */
 @RunWith(SpringRunner.class)
 @WebMvcTest(secure = false)
 public class WebMvcTestAllControllersIntegrationTests {
 
+	@Rule
+	public ExpectedException thrown = ExpectedException.none();
+
 	@Autowired
 	private MockMvc mvc;
 
@@ -57,4 +66,17 @@ public class WebMvcTestAllControllersIntegrationTests {
 				.andExpect(status().isOk());
 	}
 
+	@Test
+	public void shouldRunValidationSuccess() throws Exception {
+		this.mvc.perform(get("/three/OK"))
+				.andExpect(status().isOk())
+				.andExpect(content().string("Hello OK"));
+	}
+
+	@Test
+	public void shouldRunValidationFailure() throws Exception {
+		this.thrown.expectCause(isA(ConstraintViolationException.class));
+		this.mvc.perform(get("/three/invalid"));
+	}
+
 }