Upstream string_util function.

ios/chrome/common/string_util_unittest.mm

+// Copyright 2013 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/chrome/common/string_util.h"
+
+#include "base/mac/scoped_nsobject.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/gtest_mac.h"
+#include "testing/platform_test.h"
+
+namespace {
+
+TEST(StringUtilTest, ParseStringWithLink) {
+  NSArray* const all_test_data = @[
+    @{
+      @"input" : @"Text without link.",
+      @"expected" : @"Text without link.",
+      @"link range" : [NSValue valueWithRange:NSMakeRange(NSNotFound, 0)]
+    },
+    @{
+      @"input" : @"Text with empty link BEGIN_LINK END_LINK.",
+      @"expected" : @"Text with empty link .",
+      @"link range" : [NSValue valueWithRange:NSMakeRange(21, 0)]
+    },
+    @{
+      @"input" : @"Text with BEGIN_LINK and no end link.",
+      @"expected" : @"Text with BEGIN_LINK and no end link.",
+      @"link range" : [NSValue valueWithRange:NSMakeRange(NSNotFound, 0)]
+    },
+    @{
+      @"input" : @"Text with valid BEGIN_LINK link END_LINK and spaces.",
+      @"expected" : @"Text with valid link and spaces.",
+      @"link range" : [NSValue valueWithRange:NSMakeRange(16, 4)]
+    },
+    @{
+      @"input" : @"Text with valid BEGIN_LINKlinkEND_LINK and no spaces.",
+      @"expected" : @"Text with valid link and no spaces.",
+      @"link range" : [NSValue valueWithRange:NSMakeRange(16, 4)]
+    }
+  ];
+  for (NSDictionary* test_data : all_test_data) {
+    NSString* input_text = test_data[@"input"];
+    NSString* expected_text = test_data[@"expected"];
+    NSRange expected_range = [test_data[@"link range"] rangeValue];
+
+    EXPECT_NSEQ(expected_text, ParseStringWithLink(input_text, nullptr));
+
+    // Initialize |range| with some values that are not equal to the expected
+    // ones.
+    NSRange range = NSMakeRange(1000, 2000);
+    EXPECT_NSEQ(expected_text, ParseStringWithLink(input_text, &range));
+    EXPECT_EQ(expected_range.location, range.location);
+    EXPECT_EQ(expected_range.length, range.length);
+  }
+}
+
+}  // namespace