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Minimal test - lines (11, 33)

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TEST(Encoding, GoodSurrogatePair)
{
  // When this string is decoded, the surrogate pair is U+10302 and the rest of
  // the string is specified by indexes 2 onward.
  const char16_t goodPairData[] = {0xD800, 0xDF02, 0x65, 0x78, 0x0};
  nsDependentString goodPair16(goodPairData);

  uint32_t byteCount = 0;
  char* goodPair8 = ToNewUTF8String(goodPair16, &byteCount);
  EXPECT_TRUE(!!goodPair8);

  EXPECT_EQ(byteCount, 6u);

  const unsigned char expected8[] = {0xF0, 0x90, 0x8C, 0x82, 0x65, 0x78, 0x0};
  EXPECT_EQ(0, memcmp(expected8, goodPair8, sizeof(expected8)));

  // This takes a different code path from the above, so test it to make sure
  // the UTF-16 enumeration remains in sync with the UTF-8 enumeration.
  nsDependentCString expected((const char*)expected8);
  EXPECT_EQ(0, CompareUTF8toUTF16(expected, goodPair16));

  free(goodPair8);
}