Simplify code in spring-test by using Collections.addAll

Closes gh-24555

spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/HtmlUnitRequestBuilder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -22,6 +22,7 @@ import java.net.URLDecoder;
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.Enumeration;
 import java.util.List;
 import java.util.Locale;
@@ -291,9 +292,7 @@ final class HtmlUnitRequestBuilder implements RequestBuilder, Mergeable {
 
 		Cookie[] parentCookies = request.getCookies();
 		if (parentCookies != null) {
-			for (Cookie cookie : parentCookies) {
-				cookies.add(cookie);
-			}
+			Collections.addAll(cookies, parentCookies);
 		}
 
 		if (!ObjectUtils.isEmpty(cookies)) {

spring-test/src/main/java/org/springframework/test/web/servlet/htmlunit/MockMvcWebConnectionBuilderSupport.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -17,6 +17,7 @@
 package org.springframework.test.web.servlet.htmlunit;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.List;
 
 import com.gargoylesoftware.htmlunit.WebClient;
@@ -118,9 +119,7 @@ public abstract class MockMvcWebConnectionBuilderSupport<T extends MockMvcWebCon
 	 */
 	@SuppressWarnings("unchecked")
 	public T useMockMvc(WebRequestMatcher... matchers) {
-		for (WebRequestMatcher matcher : matchers) {
-			this.requestMatchers.add(matcher);
-		}
+		Collections.addAll(this.requestMatchers, matchers);
 		return (T) this;
 	}