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GH-48721: [C++] Add test for UTF-8 filenames on Windows #48722

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GH-48721: [C++] Add test for UTF-8 filenames on Windows #48722

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[C++] Add test for UTF-8 filenames on Windows
HyukjinKwon Jan 4, 2026
c626150
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HyukjinKwon Jan 7, 2026
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20 changes: 19 additions & 1 deletion cpp/src/arrow/io/file_test.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -115,7 +115,25 @@ TEST_F(TestFileOutputStream, FileNameWideCharConversionRangeException) {
ASSERT_RAISES(Invalid, ReadableFile::Open(file_name));
}

// TODO add a test with a valid utf-8 filename
TEST_F(TestFileOutputStream, FileNameValidUtf8) {
// Test that file operations work with UTF-8 filenames (Korean + emoji).
// On Windows, PlatformFilename::FromString() converts UTF-8 strings to wide strings.
// On Unix, filenames are treated as opaque byte strings.
std::string utf8_file_name = "test_file_한국어_😀.txt";
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@HyukjinKwon HyukjinKwon Jan 6, 2026

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한국어 is "Korean" in Korean FYI .. :-)..

std::string utf8_path = TempFile(utf8_file_name);

ASSERT_OK_AND_ASSIGN(auto file, FileOutputStream::Open(utf8_path));
const char* data = "test content";
ASSERT_OK(file->Write(data, strlen(data)));
ASSERT_OK(file->Close());

// Verify we can read it back
ASSERT_OK_AND_ASSIGN(auto readable_file, ReadableFile::Open(utf8_path));
ASSERT_OK_AND_ASSIGN(auto buffer, readable_file->ReadAt(0, strlen(data)));
ASSERT_EQ(std::string(reinterpret_cast<const char*>(buffer->data()), buffer->size()),
std::string(data));
ASSERT_OK(readable_file->Close());
}
#endif

TEST_F(TestFileOutputStream, DestructorClosesFile) {
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