Fix bean name of EnvironmentEndpointWebExtension

Closes gh-12827

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/env/EnvironmentEndpointAutoConfiguration.java

 /*
- * Copyright 2012-2017 the original author or authors.
+ * Copyright 2012-2018 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.
@@ -61,7 +61,7 @@ public class EnvironmentEndpointAutoConfiguration {
 	@ConditionalOnMissingBean
 	@ConditionalOnEnabledEndpoint
 	@ConditionalOnBean(EnvironmentEndpoint.class)
-	public EnvironmentEndpointWebExtension environmentWebEndpointExtension(
+	public EnvironmentEndpointWebExtension environmentEndpointWebExtension(
 			EnvironmentEndpoint environmentEndpoint) {
 		return new EnvironmentEndpointWebExtension(environmentEndpoint);
 	}

spring-boot-samples/spring-boot-sample-actuator/src/test/java/sample/actuator/ManagementPortAndPathSampleActuatorApplicationTests.java

@@ -21,11 +21,13 @@ import java.util.Map;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.actuate.autoconfigure.web.server.LocalManagementPort;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.test.web.client.TestRestTemplate;
 import org.springframework.boot.web.server.LocalServerPort;
+import org.springframework.core.env.Environment;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.test.context.junit4.SpringRunner;
@@ -49,6 +51,9 @@ public class ManagementPortAndPathSampleActuatorApplicationTests {
 	@LocalManagementPort
 	private int managementPort = 9011;
 
+	@Autowired
+	private Environment environment;
+
 	@Test
 	public void testHome() {
 		@SuppressWarnings("rawtypes")
@@ -79,6 +84,17 @@ public class ManagementPortAndPathSampleActuatorApplicationTests {
 		assertThat(entity.getBody()).isEqualTo("{\"status\":\"UP\"}");
 	}
 
+	@Test
+	public void testEnvNotFound() {
+		String unknownProperty = "test-does-not-exist";
+		assertThat(this.environment.containsProperty(unknownProperty)).isFalse();
+		ResponseEntity<String> entity = new TestRestTemplate()
+				.withBasicAuth("user", getPassword()).getForEntity(
+				"http://localhost:" + this.managementPort + "/admin/env/" + unknownProperty,
+						String.class);
+		assertThat(entity.getStatusCode()).isEqualTo(HttpStatus.NOT_FOUND);
+	}
+
 	@Test
 	public void testMissing() {
 		ResponseEntity<String> entity = new TestRestTemplate("user", getPassword())