test: add tests for EscapeHexCellWriteHandler

[nkuprins]

Related: #1000

Purpose of the pull request

EscapeHexCellWriteHandler has no tests. It used to have them, but they were deleted by accident (read #1000).

This PR is not a blind restore of those lost tests! I took a different approach; for example, @ParameterizedTest were used for better scalability and readability, etc.

What's changed?

• Two parameterised tables covering the escaping rule itself. Seven inputs that must be rewritten (_xHHHH_ to _x005F_xHHHH_) and eight that must be left exactly as typed.
• Non-idempotency: an already-escaped literal is escaped again.
• Guard tests for the inputs the handler must not act on: non-STRING cell data, a null WriteCellData, and a STRING holding a null value.
• One end-to-end case, parameterised over XLSX/XLS/CSV with @ExcelFormatSource: write a file through Fesod with the handler registered, read it back, and require the caller's literal. It sits in its own class tagged ROUND_TRIP, which keeps the rest tagged UNIT.

Checklist

• I have read the Contributor Guide.
• I have written the necessary doc or comment.
• I have added the necessary unit tests and all cases have passed.

[Copilot]

Pull request overview

Adds comprehensive regression tests for EscapeHexCellWriteHandler (per #1000), re-establishing coverage for both the core escaping rule and an end-to-end round-trip scenario across supported formats.

Changes:

• Adds parameterized unit tests covering valid _xHHHH_ escaping, invalid patterns, non-idempotency, and null/non-string guards.
• Adds a ROUND_TRIP integration test parameterized over XLSX/XLS/CSV to ensure the literal sequence survives write+read with the handler registered.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
fesod-sheet/src/test/java/org/apache/fesod/sheet/write/handler/EscapeHexCellWriteHandlerTest.java	Unit-level parameterized coverage for pattern escaping and guard conditions.
fesod-sheet/src/test/java/org/apache/fesod/sheet/write/handler/EscapeHexCellWriteHandlerRoundTripTest.java	End-to-end round-trip test across XLSX/XLS/CSV with the handler registered.

Suppressed comments (1)

fesod-sheet/src/test/java/org/apache/fesod/sheet/write/handler/EscapeHexCellWriteHandlerRoundTripTest.java:63

• Reading the generated CSV with FileReader relies on the platform default charset. Use UTF-8 explicitly so the round-trip assertion is stable across environments.

        if (format == ExcelFormat.CSV) {
            try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
                reader.readLine(); // header
                return reader.readLine();
            }

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[delei]

LGTM.
@alaahong PTAL when it is convenient for you.

[alaahong]

Generally fine, can you revise the code as common practice?

[alaahong]

It should be fine, a little suggestion, seems it's bringing some new additional exceptions by testing code?
https://github.com/apache/fesod/actions/runs/31603043137/job/94135710567

[nkuprins]

Hi @alaahong! Thank you for the review!

I partly based my setup on PoiUtilsTest:test_customHeight_unsupportedType_false, which has exactly the same WARN. This is why I overlooked it.

One fix could be sheet.flushRows();. However, in my case, the handler does nothing with the cell beyond cell instanceof SXSSFCell, so I decided to fix it with Mockito.mock(SXSSFCell.class), and it also makes the code easier to read.

The one thing the mock gave up was coverage of the instanceof check itself, so I've pushed a follow-up test, afterCellDataConverted_ignoresNonSxssfCells, which runs the handler over a mocked HSSFCell and asserts the value is left untouched.

Please resolve the conversation if you accept this fix :)