Upstream various ios/web utilities and helpers

ios/web/net/request_group_util_unittest.mm

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ios/web/net/request_group_util.h"
+
+#include <Foundation/Foundation.h>
+
+#include "base/mac/scoped_nsobject.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+// Checks that all newly generated groupID are unique and that there are no
+// duplicates.
+TEST(RequestGroupUtilTest, RequestGroupID) {
+  base::scoped_nsobject<NSMutableSet> set([[NSMutableSet alloc] init]);
+  const size_t kGenerated = 2000;
+  for (size_t i = 0; i < kGenerated; ++i)
+    [set addObject:web::GenerateNewRequestGroupID()];
+  EXPECT_EQ(kGenerated, [set count]);
+}
+
+// Tests that the ExtractRequestGroupIDFromUserAgent function behaves as
+// intended.
+TEST(RequestGroupUtilTest, ExtractRequestGroupIDFromUserAgent) {
+  EXPECT_FALSE(web::ExtractRequestGroupIDFromUserAgent(nil));
+  EXPECT_FALSE(web::ExtractRequestGroupIDFromUserAgent(
+      @"Lynx/2.8.1pre.9 libwww-FM/2.14"));
+  EXPECT_FALSE(web::ExtractRequestGroupIDFromUserAgent(@"    "));
+  EXPECT_TRUE([web::ExtractRequestGroupIDFromUserAgent(@"Mozilla/3.04 (WinNT)")
+      isEqualToString:@"WinNT"]);
+}