refactor(markdown_parser): deduplicate normalize_html test helper

[jfmcdowell]

Note

This PR was created with AI assistance (Claude Code).

Summary

Extracts the shared normalize_html test helper into tests/test_utils.rs. Both spec_test.rs and fuzz_differential.rs maintained identical local copies of this function, which could silently diverge if one is updated without the other.

Test Plan

• just test-crate biome_markdown_parser — all 84 spec tests pass
• just test-markdown-conformance — 652/652, 100% coverage, 0 panics

Docs

N/A

[changeset-bot]

⚠️ No Changeset found

Latest commit: fd5f061

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[codspeed-hq]

Merging this PR will not alter performance

✅ 1 untouched benchmark
⏩ 255 skipped benchmarks¹

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_{Comparing jfmcdowell:refactor/md-dedup-normalize-html (fd5f061) with main (b6139b4)²}

Footnotes

1. 255 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (3cee636) during the generation of this report, so b6139b4 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 3cee636 and fd5f061.

⛔ Files ignored due to path filters (1)

• crates/biome_configuration/src/generated/linter_options_check.rs is excluded by !**/generated/**, !**/generated/** and included by **

📒 Files selected for processing (4)

• crates/biome_markdown_parser/tests/fuzz_differential.rs
• crates/biome_markdown_parser/tests/spec_test.rs
• crates/biome_markdown_parser/tests/test_utils.rs
• deny.toml

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Walkthrough

The PR consolidates duplicate HTML normalisation logic from markdown parser test files into a centralised shared utility module. Two test files (fuzz_differential.rs and spec_test.rs) previously contained identical normalize_html implementations; these are now replaced with imports from a new test_utils.rs module. The normalisation function preserves whitespace within <pre> tags whilst trimming trailing whitespace elsewhere, then appends a final newline. A minor quote style adjustment in deny.toml rounds out the changes.

Possibly related PRs

• test(markdown_parser): add differential fuzzer against commonmark.js #9784: Modifies markdown parser tests' HTML normalisation behaviour and touches the same normalize_html logic in fuzz_differential.rs
• fix(markdown_parser): incorrect tight/loose list classification at marker boundaries #9787: Introduced the per-file normalize_html implementations that are being consolidated in this PR

Suggested reviewers

• ematipico
• dyc3

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: extracting a duplicated normalize_html function into a shared test utility module to prevent divergence.
Description check	✅ Passed	The description clearly explains the refactoring effort, motivation (preventing silent divergence), testing approach, and results—all directly related to the changeset.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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