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#include "base/sys_string_conversions.h"
#include "testing/gtest/include/gtest/gtest.h"

// Apparently Windows doesn't have constants for these.
static const int kCpLatin1 = 850;
static const int kCpBig5 = 950;

TEST(SysStringsWin, SysWideToUTF8) {
  using base::SysWideToUTF8;
  EXPECT_EQ("Hello, world", SysWideToUTF8(L"Hello, world"));
  EXPECT_EQ("\xe4\xbd\xa0\xe5\xa5\xbd", SysWideToUTF8(L"\x4f60\x597d"));
  EXPECT_EQ("\xF0\x90\x8C\x80", SysWideToUTF8(L"\xd800\xdf00"));  // >16 bits

  // Error case. When Windows finds a UTF-16 character going off the end of
  // a string, it just converts that literal value to UTF-8, even though this
  // is invalid.
  //
  // This is what XP does, but Vista has different behavior, so we don't bother
  // verifying it:
  //EXPECT_EQ("\xE4\xBD\xA0\xED\xA0\x80zyxw", SysWideToUTF8(L"\x4f60\xd800zyxw"));

  // Test embedded NULLs.
  std::wstring wide_null(L"a");
  wide_null.push_back(0);
  wide_null.push_back('b');

  std::string expected_null("a");
  expected_null.push_back(0);
  expected_null.push_back('b');

  EXPECT_EQ(expected_null, SysWideToUTF8(wide_null));
}

TEST(SysStringsWin, SysUTF8ToWide) {
  using base::SysUTF8ToWide;
  EXPECT_EQ(L"Hello, world", SysUTF8ToWide("Hello, world"));
  EXPECT_EQ(L"\x4f60\x597d", SysUTF8ToWide("\xe4\xbd\xa0\xe5\xa5\xbd"));
  EXPECT_EQ(L"\xd800\xdf00", SysUTF8ToWide("\xF0\x90\x8C\x80"));  // >16 bits

  // Error case. When Windows finds an invalid UTF-8 character, it just skips
  // it. This seems weird because it's inconsistent with the reverse conversion.
  //
  // This is what XP does, but Vista has different behavior, so we don't bother
  // verifying it:
  //EXPECT_EQ(L"\x4f60zyxw", SysUTF8ToWide("\xe4\xbd\xa0\xe5\xa5zyxw"));

  // Test embedded NULLs.
  std::string utf8_null("a");
  utf8_null.push_back(0);
  utf8_null.push_back('b');

  std::wstring expected_null(L"a");
  expected_null.push_back(0);
  expected_null.push_back('b');

  EXPECT_EQ(expected_null, SysUTF8ToWide(utf8_null));
}