Fix checkstyle violations in samples

spring-boot-samples/spring-boot-sample-secure-oauth2-resource/src/test/java/sample/secure/oauth2/resource/SampleSecureOAuth2ResourceApplicationTests.java

@@ -1,5 +1,5 @@
 /*
- * 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.
@@ -28,16 +28,16 @@ import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.security.web.FilterChainProxy;
 import org.springframework.test.context.junit4.SpringRunner;
 import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
 import org.springframework.web.context.WebApplicationContext;
 
 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.status;
-import static org.springframework.test.web.servlet.setup.MockMvcBuilders.webAppContextSetup;
 
 /**
  * Series of automated integration tests to verify proper behavior of auto-configured,
- * OAuth2-secured system
+ * OAuth2-secured system.
  *
  * @author Greg Turnquist
  * @author Dave Syer
@@ -56,7 +56,8 @@ public class SampleSecureOAuth2ResourceApplicationTests {
 
 	@Before
 	public void setUp() {
-		this.mvc = webAppContextSetup(this.context).addFilters(this.filterChain).build();
+		this.mvc = MockMvcBuilders.webAppContextSetup(this.context)
+				.addFilters(this.filterChain).build();
 		SecurityContextHolder.clearContext();
 	}