text: #include "cru/common/String.h"
  #include "cru/common/StringUtil.h"
  
  #include <catch2/catch_test_macros.hpp>
  
  using cru::k_invalid_code_point;
  
  TEST_CASE("StringUtil Utf8NextCodePoint", "[string]") {
    using cru::Utf8NextCodePoint;
    std::string_view text = "aπ你🤣!";
    gsl::index current = 0;
    REQUIRE(Utf8NextCodePoint(text.data(), text.size(), current, &current) ==
            0x0061);
    REQUIRE(Utf8NextCodePoint(text.data(), text.size(), current, &current) ==
            0x03C0);
    REQUIRE(Utf8NextCodePoint(text.data(), text.size(), current, &current) ==
            0x4F60);
    REQUIRE(Utf8NextCodePoint(text.data(), text.size(), current, &current) ==
            0x1F923);
    REQUIRE(Utf8NextCodePoint(text.data(), text.size(), current, &current) ==
            0x0021);
    REQUIRE(Utf8NextCodePoint(text.data(), text.size(), current, &current) ==
            k_invalid_code_point);
    REQUIRE(current == static_cast<gsl::index>(text.size()));
  }
  
  TEST_CASE("StringUtil Utf16NextCodePoint", "[string]") {
    using cru::Utf16NextCodePoint;
    std::u16string_view text = u"aπ你🤣!";
    gsl::index current = 0;
    REQUIRE(Utf16NextCodePoint(text.data(), text.size(), current, &current) ==
            0x0061);
    REQUIRE(Utf16NextCodePoint(text.data(), text.size(), current, &current) ==
            0x03C0);
    REQUIRE(Utf16NextCodePoint(text.data(), text.size(), current, &current) ==
            0x4F60);
    REQUIRE(Utf16NextCodePoint(text.data(), text.size(), current, &current) ==
            0x1F923);
    REQUIRE(Utf16NextCodePoint(text.data(), text.size(), current, &current) ==
            0x0021);
    REQUIRE(Utf16NextCodePoint(text.data(), text.size(), current, &current) ==
            k_invalid_code_point);
    REQUIRE(current == static_cast<gsl::index>(text.size()));
  }
  
  TEST_CASE("StringUtil Utf16PreviousCodePoint", "[string]") {
    using cru::Utf16PreviousCodePoint;
    std::u16string_view text = u"aπ你🤣!";
    gsl::index current = text.size();
    REQUIRE(Utf16PreviousCodePoint(text.data(), text.size(), current, &current) ==
            0x0021);
    REQUIRE(Utf16PreviousCodePoint(text.data(), text.size(), current, &current) ==
            0x1F923);
    REQUIRE(Utf16PreviousCodePoint(text.data(), text.size(), current, &current) ==
            0x4F60);
    REQUIRE(Utf16PreviousCodePoint(text.data(), text.size(), current, &current) ==
            0x03C0);
    REQUIRE(Utf16PreviousCodePoint(text.data(), text.size(), current, &current) ==
            0x0061);
    REQUIRE(Utf16PreviousCodePoint(text.data(), text.size(), current, &current) ==
            k_invalid_code_point);
    REQUIRE(current == 0);
  }
  
  TEST_CASE("StringUtil Utf8CodePointIterator", "[string]") {
    using cru::Utf8CodePointIterator;
    std::string_view text = "aπ你🤣!";
    std::vector<cru::CodePoint> code_points;
  
    for (auto cp : Utf8CodePointIterator(text.data(), text.size())) {
      code_points.push_back(cp);
    }
  
    std::vector<cru::CodePoint> expected_code_points{0x0061, 0x03C0, 0x4F60,
                                                     0x1F923, 0x0021};
  
    REQUIRE(code_points == expected_code_points);
  }
  
  TEST_CASE("StringUtil Utf16CodePointIterator", "[string]") {
    using cru::Utf16CodePointIterator;
    std::u16string_view text = u"aπ你🤣!";
    std::vector<cru::CodePoint> code_points;
  
    for (auto cp : Utf16CodePointIterator(text.data(), text.size())) {
      code_points.push_back(cp);
    }
  
    std::vector<cru::CodePoint> expected_code_points{0x0061, 0x03C0, 0x4F60,
                                                     0x1F923, 0x0021};
  
    REQUIRE(code_points == expected_code_points);
  }
  
  // TEST(WinString, IndexUtf8ToUtf16) {
  //   using cru::platform::win::IndexUtf8ToUtf16;
  //   std::string_view utf8_string = "aπ你🤣!";
  //   std::wstring_view utf16_string = L"aπ你🤣!";
  //   REQUIRE(IndexUtf8ToUtf16(utf8_string, 0, utf16_string), 0);
  //   REQUIRE(IndexUtf8ToUtf16(utf8_string, 1, utf16_string), 1);
  //   REQUIRE(IndexUtf8ToUtf16(utf8_string, 3, utf16_string), 2);
  //   REQUIRE(IndexUtf8ToUtf16(utf8_string, 6, utf16_string), 3);
  //   REQUIRE(IndexUtf8ToUtf16(utf8_string, 10, utf16_string), 5);
  //   REQUIRE(IndexUtf8ToUtf16(utf8_string, 11, utf16_string), 6);
  // }
  
  // TEST(WinString, IndexUtf16ToUtf8) {
  //   using cru::platform::win::IndexUtf16ToUtf8;
  //   std::string_view utf8_string = "aπ你🤣!";
  //   std::wstring_view utf16_string = L"aπ你🤣!";
  //   REQUIRE(IndexUtf16ToUtf8(utf16_string, 0, utf8_string), 0);
  //   REQUIRE(IndexUtf16ToUtf8(utf16_string, 1, utf8_string), 1);
  //   REQUIRE(IndexUtf16ToUtf8(utf16_string, 2, utf8_string), 3);
  //   REQUIRE(IndexUtf16ToUtf8(utf16_string, 3, utf8_string), 6);
  //   REQUIRE(IndexUtf16ToUtf8(utf16_string, 5, utf8_string), 10);
  //   REQUIRE(IndexUtf16ToUtf8(utf16_string, 6, utf8_string), 11);
  // }
  