tests: internal: input_chunk_routes: Windows support

[mabrarov]

Support of Windows in flb-it-input_chunk_routes tests (introduced in #11097).

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Testing

• [N/A] Example configuration file for the change.
• [N/A] Debug log output from testing the change.
• Attached Valgrind output that shows no leaks or memory corruption was found - refer to flb_run_code_analysis.log for the output of command

  TEST_PRESET=valgrind SKIP_TESTS='flb-rt-out_td flb-it-network' ./run_code_analysis.sh

• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• [N/A] Documentation required for this feature.

Backporting

• [N/A] Backport to latest stable release.

Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

• Tests
  • Tests now use per-test temporary directories instead of fixed paths for isolated artifacts.
  • Setup/teardown updated to propagate dynamic paths through test flows, with improved error handling and guaranteed freeing to avoid leftovers and leaks.
• New Features
  • Added small helper utilities to detect and build temporary directory paths for tests.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

📝 Walkthrough

Walkthrough

Switch tests from hard-coded /tmp paths to environment-aware temporary directories by adding tempdir helper functions, including the helper in internal test headers, and propagating dynamic path allocation, NULL checks, and frees through multiple input-chunk tests and their setup/teardown. (30 words)

Changes

Cohort / File(s)	Summary
Tempdir helper tests/include/flb_tests_tmpdir.h	Add static inline helpers flb_test_env_tmpdir() and flb_test_tmpdir_cat(const char *postfix) that return newly allocated tempdir strings.
Test harness include update tests/internal/flb_tests_internal.h.in	Include flb_tests_tmpdir.h to expose tempdir utilities to internal tests.
Input chunk tests — dynamic paths tests/internal/input_chunk_routes.c, tests/internal/input_chunk.c	Replace hard-coded /tmp/TEST_STREAM_PATH constants with dynamically allocated stream_path/storage_path via tempdir helpers; add allocation NULL/error checks; free allocations on error and cleanup; propagate dynamic paths into setup/cleanup calls and test routines.

Sequence Diagram(s)

(omitted)

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Suggested reviewers

• edsiper

Poem

🐇 I nibbled paths where /tmp once lay,

I stitched new burrows for each test-day,
I allocate, check, then free with care,
No stray footprints linger anywhere,
Hopping happy in tidy fileplay.

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 18.18% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding Windows support for input_chunk_routes tests by introducing platform-independent temporary directory handling.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

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[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: cfa533bbda

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@tests/internal/input_chunk_routes.c`:
- Around line 338-356: The env_tmpdir function currently checks TMPDIR then TMP
and falls back to "/tmp", which fails on Windows when TEMP is set but TMP is
not; update env_tmpdir to also check getenv("TEMP") before the fallback and on
Windows use a Windows-appropriate fallback (either call
GetTempPathA()/GetTempPathW when available or use "C:\\Temp") instead of "/tmp",
returning the result via flb_strdup to match existing allocation behavior.

🧹 Nitpick comments (1)

tests/internal/input_chunk_routes.c (1)

20-21: Remove duplicate flb_mem.h include.

<fluent-bit/flb_mem.h> is already included at Line 10, so the Line 20 include is redundant.

♻️ Suggested cleanup

-#include <fluent-bit/flb_mem.h>
 `#include` <fluent-bit/flb_str.h>