Simplify Configuring RequestCache

Now the RequestCache is configured on any default success handler.

Fixes: gh-5582

config/src/test/java/org/springframework/security/config/annotation/web/configurers/FormLoginConfigurerTests.java

@@ -0,0 +1,72 @@
+/*
+ * 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
+ *
+ *      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.security.config.annotation.web.configurers;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
+import org.springframework.security.config.test.SpringTestRule;
+import org.springframework.security.config.users.AuthenticationTestConfiguration;
+import org.springframework.security.web.savedrequest.RequestCache;
+import org.springframework.test.web.servlet.MockMvc;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.verify;
+import static org.springframework.security.test.web.servlet.request.SecurityMockMvcRequestBuilders.formLogin;
+import static org.springframework.security.test.web.servlet.response.SecurityMockMvcResultMatchers.authenticated;
+
+/**
+ * @author Rob Winch
+ * @since 5.1
+ */
+public class FormLoginConfigurerTests {
+	@Rule
+	public final SpringTestRule spring = new SpringTestRule();
+
+	@Autowired
+	private MockMvc mockMvc;
+
+	@Test
+	public void requestCache() throws Exception {
+		this.spring.register(RequestCacheConfig.class,
+				AuthenticationTestConfiguration.class).autowire();
+
+		RequestCacheConfig config = this.spring.getContext().getBean(RequestCacheConfig.class);
+
+		this.mockMvc.perform(formLogin())
+				.andExpect(authenticated());
+
+		verify(config.requestCache).getRequest(any(), any());
+	}
+
+	@EnableWebSecurity
+	static class RequestCacheConfig extends WebSecurityConfigurerAdapter {
+		private RequestCache requestCache = mock(RequestCache.class);
+
+		@Override
+		protected void configure(HttpSecurity http) throws Exception {
+			http
+				.formLogin().and()
+				.requestCache()
+					.requestCache(this.requestCache);
+		}
+	}
+}