windows ci speedup

[aidankeefe2022]

The largest gain was from causing the large files that are created for large file tests to be sparse. This means they are not written to disk and read from disk but effectively mocked. Posix does this automatically it took some windows Syscalls to get the same behavior on windows. We also now run the files in parallel thanks to not actually writing the files to disk this is no problem. we now have test run times down from ~5 mins to ~1:30 mins. There is also a change to make sure there are no issues with hard coded ports so we have out tests choose free ports at run time.

[wolfSSL-Fenrir-bot]

Fenrir Automated Review — PR #249

No scan targets match the changed files in this PR. Review skipped.

[Copilot]

Pull request overview

This PR speeds up Windows CI for wolfCLU by avoiding physical writes for multi‑GB large-file tests (via sparse files on Windows), running Python test modules in parallel, and reducing port-collision issues by selecting ports at runtime.

Changes:

• Add Windows sparse-file helpers and use them for large-file hash/dgst tests.
• Replace the serial Windows Python test runner with a parallel per-file runner.
• Switch server/OCSP tests away from hard-coded ports to OS-assigned free ports.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/wolfclu_test.py	Adds find_free_port() plus Windows sparse-file helpers (make_sparse, truncate_sparse).
tests/server/server-test.py	Uses find_free_port() for s_server/s_client instead of a hard-coded port.
tests/ocsp/ocsp-test.py	Reuses shared find_free_port() helper (removes local implementation).
tests/hash/hash-test.py	Uses truncate_sparse() when creating large test files.
tests/dgst/dgst-test.py	Uses truncate_sparse() when creating large test files.
tests/run_tests.py	Removes the old serial Windows test runner.
tests/run_tests_parallel.py	Adds a parallel per-test-file runner (spawns each *-test.py in its own process).
.github/workflows/windows-check.yml	Uses the new parallel test runner and increases CI timeout.

Comments suppressed due to low confidence (1)

tests/server/server-test.py:41

• When s_server fails to bind (e.g., port race due to find_free_port() under parallel runs), the current readiness loop will still wait the full timeout and then report a generic "did not become ready". Checking server.poll() lets the test fail fast with a more actionable error (and avoids hiding immediate bind failures).

            [WOLFSSL_BIN, "s_server", "-port", str(port),
             "-key", os.path.join(CERTS_DIR, "server-key.pem"),
             "-cert", os.path.join(CERTS_DIR, "server-cert.pem"),
             "-noVerify", "-readyFile", readyfile],
            stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL,

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