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[Repo Assist] test: add l_getrandom coverage in test_utils.c#139

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[Repo Assist] test: add l_getrandom coverage in test_utils.c#139
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repo-assist/test-getrandom-2026-04-19-e43284a-26e8eae8b522b2c6

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🤖 This is an automated pull request from Repo Assist.

Summary

l_getrandom (getrandom(2) on Linux/ARM/AArch64, BCryptGenRandom on Windows) had no regression tests. This PR adds test_getrandom() to test_utils.c covering:

  • Return value (0 on success)
  • Non-zero output (CSPRNG quality check — 32 bytes all-zero is astronomically improbable)
  • Independence: two successive calls produce distinct output
  • Single-byte request
  • Zero-byte edge case

Coverage Impact

l_getrandom moves from to in the README coverage matrix, taking total coverage from 244 to 245 of 249 functions (98%).

Test Status

✅ Linux/gcc: build PASS, 1515 assertions PASS
✅ Linux/clang: build PASS, 1513 assertions PASS
✅ Verify: 52 binaries, max 117KB, static PASS

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
README.md is auto-generated by gen-docs.ps1; docs were restructured in #152.
Drop the auto-generated coverage-table edit to unblock merging this PR.
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Commit pushed: b435883

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Commit pushed: b13c45d

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