59 lines
2.3 KiB
C++
59 lines
2.3 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include <jsinspector-modern/Utf8.h>
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#include <gmock/gmock.h>
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#include <gtest/gtest.h>
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using namespace ::testing;
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namespace facebook::react::jsinspector_modern {
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TEST(Utf8Test, TruncateToValidUtf8) {
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auto buffer = std::vector<char>();
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std::vector<std::pair<std::string, size_t>> expectedStringsUpToSizes;
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// Construct a buffer with a concatenation of all code points, and a vector
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// or "expectedStringsUpToSizes", pairs of valid UTF8 prefix strings and sizes
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// "n" such that the string would be the expected truncation of the first "n"
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// bytes of the buffer.
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for (const std::string& codePoint : {
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"a", // 1 byte
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"é", // 2 bytes
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"✓", // 3 bytes
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"😀" // 4 bytes
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}) {
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auto partial = std::string(buffer.data(), buffer.size());
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buffer.insert(buffer.end(), codePoint.begin(), codePoint.end());
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expectedStringsUpToSizes.push_back(std::pair(partial, buffer.size()));
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}
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// The constructed buffer is 10 bytes long, comprised of 4 code points of
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// varied size. Range over naive slices of length 0-9 ensuring that the
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// truncated result matches the valid UTF8 substring of length <= n.
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size_t n = 0;
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for (const auto& expectedStringUpToSize : expectedStringsUpToSizes) {
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auto nextSize = expectedStringUpToSize.second;
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auto expectedString = expectedStringUpToSize.first;
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for (; n < nextSize; ++n) {
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// Take the first n bytes of the whole buffer, which may be slicing
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// through the middle of a code point.
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std::vector<char> slice(buffer.begin(), buffer.begin() + n);
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truncateToValidUTF8(slice);
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// Expect the final code point fragment has been discarded and that the
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// contents are equal to expectedString, which is valid UTF8.
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EXPECT_EQ(std::string(slice.begin(), slice.end()), expectedString);
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}
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}
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// Finally verify that truncating the whole buffer, which is already valid
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// UTF8, is a no-op.
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auto wholeString = std::string(buffer.begin(), buffer.end());
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truncateToValidUTF8(buffer);
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EXPECT_EQ(std::string(buffer.begin(), buffer.end()), wholeString);
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}
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} // namespace facebook::react::jsinspector_modern
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