third_party/WebKit/Source/core/html/HTMLTextAreaElementTest.cpp

// Copyright 2016 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 "core/html/HTMLTextAreaElement.h"

#include "testing/gtest/include/gtest/gtest.h"
#include "wtf/text/StringBuilder.h"

namespace blink {

TEST(HTMLTextAreaElementTest, SanitizeUserInputValue) {
  UChar kLeadSurrogate = 0xD800;
  EXPECT_EQ("", HTMLTextAreaElement::sanitizeUserInputValue("", 0));
  EXPECT_EQ("", HTMLTextAreaElement::sanitizeUserInputValue("a", 0));
  EXPECT_EQ("", HTMLTextAreaElement::sanitizeUserInputValue("\n", 0));
  StringBuilder builder;
  builder.append(kLeadSurrogate);
  String leadSurrogate = builder.toString();
  EXPECT_EQ("", HTMLTextAreaElement::sanitizeUserInputValue(leadSurrogate, 0));

  EXPECT_EQ("", HTMLTextAreaElement::sanitizeUserInputValue("", 1));
  EXPECT_EQ("", HTMLTextAreaElement::sanitizeUserInputValue(leadSurrogate, 1));
  EXPECT_EQ("a", HTMLTextAreaElement::sanitizeUserInputValue("a", 1));
  EXPECT_EQ("\n", HTMLTextAreaElement::sanitizeUserInputValue("\n", 1));
  EXPECT_EQ("\n", HTMLTextAreaElement::sanitizeUserInputValue("\n", 2));

  EXPECT_EQ("abc", HTMLTextAreaElement::sanitizeUserInputValue(
                       String("abc") + leadSurrogate, 4));
  EXPECT_EQ("a\ncd", HTMLTextAreaElement::sanitizeUserInputValue("a\ncdef", 4));
  EXPECT_EQ("a\rcd", HTMLTextAreaElement::sanitizeUserInputValue("a\rcdef", 4));
  EXPECT_EQ("a\r\ncd",
            HTMLTextAreaElement::sanitizeUserInputValue("a\r\ncdef", 4));
}

}  // namespace blink