Add Configuration Test

Issue gh-11327

config/src/test/java/org/springframework/security/config/http/MiscHttpConfigTests.java

@@ -548,6 +548,14 @@ public class MiscHttpConfigTests {
 		assertThat(baos.toString()).contains("[WARN]");
 	}
 
+	@Test
+	public void configureWhenProtectingLoginPageAuthorizationManagerThenWarningLogged() {
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		redirectLogsTo(baos, DefaultFilterChainValidator.class);
+		this.spring.configLocations(xml("ProtectedLoginPageAuthorizationManager")).autowire();
+		assertThat(baos.toString()).contains("[WARN]");
+	}
+
 	@Test
 	public void configureWhenUsingDisableUrlRewritingThenRedirectIsNotEncodedByResponse()
 			throws IOException, ServletException {

config/src/test/resources/org/springframework/security/config/http/MiscHttpConfigTests-ProtectedLoginPageAuthorizationManager.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  ~ Copyright 2002-2018 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.
+  ~ You may obtain a copy of the License at
+  ~
+  ~       https://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.
+  -->
+
+<b:beans xmlns:b="http://www.springframework.org/schema/beans"
+		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		xmlns="http://www.springframework.org/schema/security"
+		xsi:schemaLocation="
+			http://www.springframework.org/schema/security
+			https://www.springframework.org/schema/security/spring-security.xsd
+			http://www.springframework.org/schema/beans
+			https://www.springframework.org/schema/beans/spring-beans.xsd">
+
+	<http use-authorization-manager="true">
+		<form-login login-page="/login"/>
+		<intercept-url pattern="/login*" access="hasRole('ROLE_A')"/>
+	</http>
+
+	<b:import resource="userservice.xml"/>
+</b:beans>