Add test coverage for hash_help module functions

[Copilot]

The hash_help module lacked test coverage for the rapidhash v3 API integration introduced in the parent PR.

Changes

• 30 new tests covering all hash_help functions:

  • hash_bytes / hash_bytes_with_seed: determinism, avalanche effect, size variations (0-10k bytes)
  • hash_file / hash_file_with_seed: file I/O correctness, consistency with byte hashing
  • RapidMap / RapidSet helpers: capacity management, hash distribution under load (1k insertions)

• Test constants for maintainability:

  const HASH_DISTRIBUTION_TEST_SIZE: usize = 1000;
  const HASH_DISTRIBUTION_MIN_UNIQUENESS: usize = 95;
  const LARGE_FILE_SIZE: usize = 100_000;

• Dev dependency: tempfile = "3.15" for file-based test fixtures

All 59 tests pass (30 new + 29 existing simd tests). Test patterns follow existing conventions from simd.rs.

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[Copilot]

Pull request overview

This pull request adds comprehensive test coverage for the hash_help module, which previously lacked tests for the rapidhash v3 API integration. The PR introduces 30 new tests covering all public functions in the module.

Changes:

• Added 30 new test functions covering hash_bytes, hash_bytes_with_seed, hash_file, hash_file_with_seed, and RapidMap/RapidSet helper functions
• Introduced test constants (HASH_DISTRIBUTION_TEST_SIZE, HASH_DISTRIBUTION_MIN_UNIQUENESS, LARGE_FILE_SIZE) for maintainability
• Added tempfile 3.15 as a dev dependency for file-based test fixtures

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
crates/utils/src/hash_help.rs	Adds comprehensive test module with 30 new tests covering all hash_help functions including determinism, avalanche effect, file I/O correctness, and hash distribution
crates/utils/Cargo.toml	Adds tempfile 3.15 as dev dependency for file-based testing
Cargo.lock	Updates lock file with tempfile and its transitive dependencies (fastrand, errno, rustix, linux-raw-sys, bitflags)

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