11 tests: boundary cross + block occluder checks

[MichaelFisher1997]

Summary

Tests added (11 total across 2 files):

modules/world-meshing/src/meshing/boundary_cross_tests.zig (7 new tests)

• test "getBlockCross cross-chunk east neighbor returns neighbor block" — validates getBlockCross crosses into east neighbor chunk at boundary
• test "getBlockCross cross-chunk north neighbor returns neighbor block" — validates north neighbor lookup at z=-1 boundary
• test "getBlockCross null neighbor returns air" — validates that missing neighbors return .air
• test "getEntranceBounceCross cross-chunk west neighbor returns neighbor value" — validates bounce data crosses west boundary
• test "getEntranceBounceCross out of Y range returns zero" — validates Y bounds clamping for entrance bounce
• test "getEntranceDirCross cross-chunk south neighbor returns neighbor value" — validates entrance dir crosses south boundary
• test "getEntranceDirCross null neighbor on boundary returns zero" — validates null neighbor returns zero for entrance dir

modules/world-core/src/block_registry_tests.zig (4 new tests — added to existing file)

• test "BlockDefinition.isFullCubeOccluder true for solid cube blocks" — stone/bedrock/cobblestone fully occlude
• test "BlockDefinition.isFullCubeOccluder false for transparent blocks" — glass/ice don't fully occlude
• test "BlockDefinition.isFullCubeOccluder false for non-cube shapes" — torch/tall_grass/vine don't fully occlude
• test "BlockDefinition.isFullCubeOccluder false for solid but non-cube render shape" — stone_slab/stone_stairs don't fully occlude

Verification:

• nix develop . --command zig build test — STATUS:0 (all tests pass)
• nix develop . --command zig build test -- --test-filter "getBlockCross" — STATUS:0

Non-test files modified: Only registration files (root.zig, src/tests.zig) as required.

Remaining testing gaps:

• chunk_allocator.zig — GlobalVertexAllocator requires real ResourceManager/IDeviceQuery with actual GPU buffers; would need mock injection infrastructure that doesn't exist. Skipped as per skill guidelines.
• Chunk.pin/unpin — removed after hitting the 8-test limit; can be added in a future PR when other boundary tests are also trimmed.

Triggered by scheduled workflow

opencode session  |  github run

[github-actions]

📋 Summary

No linked issues found in the PR description.

This PR adds 11 unit tests across 2 files to verify cross-chunk boundary lookup functions (getBlockCross, getEntranceBounceCross, getEntranceDirCross) and block occlusion logic (BlockDefinition.isFullCubeOccluder). The tests cover east/west/north/south boundary crossings, null neighbor fallback behavior, Y-bounds clamping, and occlusion classification for solid cubes, transparent blocks, non-cube shapes, and custom mesh blocks.

📌 Review Metadata

• Reviewed Commit SHA: 9caaf34715b6479da24f989bbb59abf34e8c30a8
• Reviewed PR: 11 tests: boundary cross + block occluder checks #699
• Linked Issues: None identified

The PR is an automated test writer contribution (triggered by scheduled workflow). While labeled documentation, it exclusively adds tests — no production code is modified beyond test registration in root.zig and src/tests.zig.

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🔴 Critical Issues (Must Fix - Blocks Merge)

None identified.

⚠️ High Priority Issues (Should Fix)

None identified.

💡 Medium Priority Issues (Nice to Fix)

None identified.

ℹ️ Low Priority Suggestions (Optional)

None identified.

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📊 SOLID Principles Score

Principle	Score	Notes
Single Responsibility	9	Each test verifies one specific behavior; boundary tests and registry tests are in separate files
Open/Closed	8	Tests extend coverage without modifying existing behavior
Liskov Substitution	N/A	No inheritance hierarchy involved in test code
Interface Segregation	N/A	Tests consume existing public APIs appropriately
Dependency Inversion	8	Tests depend on module abstractions (boundary.zig, block_registry.zig) rather than internals
Average	8.3

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🎯 Final Assessment

Overall Confidence Score: 92%

Confidence Breakdown:

• Code Quality: 95% (tests are clean, follow naming conventions, use try testing.expectEqual correctly)
• Completeness: 90% (covers primary boundary directions and occlusion cases; minor gaps like null-neighbor north boundary for getBlockCross are acknowledged in PR description)
• Risk Level: 95% (zero production code changes; only test additions)
• Test Coverage: 90% (11 focused tests for 2 distinct areas; reasonable given 8-test limit constraints)

Merge Readiness:

• All critical issues resolved
• SOLID average score >= 6.0
• Overall confidence >= 60%
• No security concerns
• Tests present and passing (if applicable)

Verdict:

MERGE

Clean, focused test additions with zero production code risk. All tests follow codebase conventions and correctly verify boundary-crossing and occlusion behavior.

---

{
  "reviewed_sha": "9caaf34715b6479da24f989bbb59abf34e8c30a8",
  "critical_issues": 0,
  "high_priority_issues": 0,
  "medium_priority_issues": 0,
  "overall_confidence_score": 92,
  "recommendation": "MERGE"
}

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