src/dawn/tests/unittests/UnicodeTests.cpp

// Copyright 2022 The Dawn & Tint Authors
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#include "dawn/native/ShaderModule.h"
#include "dawn/tests/unittests/validation/ValidationTest.h"

namespace dawn {
namespace {

class CountUTF16CodeUnitsFromUTF8StringTest : public ValidationTest {};

TEST_F(CountUTF16CodeUnitsFromUTF8StringTest, ValidUnicodeString) {
    struct TestCase {
        const char* u8String;
        uint64_t lengthInUTF16;
    };

    // Referenced from src/tint/utils/text/unicode_test.cc
    constexpr std::array<TestCase, 14> kTestCases = {{
        {"", 0},
        {"abc", 3},
        {"\xe4\xbd\xa0\xe5\xa5\xbd\xe4\xb8\x96\xe7\x95\x8c", 4},
        {"def\xf0\x9f\x91\x8b\xf0\x9f\x8c\x8e", 7},
        {"\xed\x9f\xbf", 1},      // CodePoint == 0xD7FF
        {"\xed\x9f\xbe", 1},      // CodePoint == 0xD7FF - 1
        {"\xee\x80\x80", 1},      // CodePoint == 0xE000
        {"\xee\x80\x81", 1},      // CodePoint == 0xE000 + 1
        {"\xef\xbf\xbf", 1},      // CodePoint == 0xFFFF
        {"\xef\xbf\xbe", 1},      // CodePoint == 0xFFFF - 1
        {"\xf0\x90\x80\x80", 2},  // CodePoint == 0x10000
        {"\xf0\x90\x80\x81", 2},  // CodePoint == 0x10000 + 1

        // While surrogates are technically invalid, CountUTF16CodeUnitsFromUTF8String supports and
        // counts them as a single UTF-16 code unit.
        {"\xed\xa0\x80", 1},  // CodePoint == 0xD7FF + 1
        {"\xed\xbf\xbf", 1},  // CodePoint == 0xE000 - 1
    }};

    for (const TestCase& testCase : kTestCases) {
        ASSERT_EQ(testCase.lengthInUTF16,
                  native::CountUTF16CodeUnitsFromUTF8String(std::string_view(testCase.u8String)));
    }
}

}  // anonymous namespace
}  // namespace dawn