Test Suite

Integration tests for codediff.nvim using plenary.nvim.

Test Coverage

✅ FFI Integration (ffi_integration_spec.lua)

C ↔ Lua boundary validation:

• Data structure conversion
• Memory management (no leaks)
• Edge cases (empty diffs, large files)

10 tests

✅ Git Integration (git_integration_spec.lua)

Git operations and async handling:

• Repository detection
• Async callbacks
• Error handling for invalid revisions
• Path calculation
• LRU cache validation

9 tests

✅ Installer (installer_spec.lua)

Automatic binary installation and version management:

• Module API validation
• VERSION loading from version.lua
• Library path construction
• Version detection from filenames
• Update necessity logic
• Platform-specific extension handling

10 tests

✅ Auto-scroll (autoscroll_spec.lua)

Diff view scrolling behavior:

• Scroll to first change
• Window centering
• Scroll sync activation

5 tests

✅ Semantic Tokens (render/semantic_tokens_spec.lua)

LSP integration and rendering:

• Module compatibility checks
• Virtual file URL handling
• Namespace management

12 tests

Running Tests

All tests:

./tests/run_plenary_tests.sh

Individual spec:

nvim --headless --noplugin -u tests/init.lua \
  -c "lua require('plenary.test_harness').test_directory('tests/ffi_integration_spec.lua')"

Test Philosophy

Focus on integration points that C tests cannot validate:

• FFI boundary integrity
• Lua async operations
• System integration (git)
• UI behavior (scrolling, rendering)

Total: 46 tests across 5 spec files using industry-standard plenary.nvim framework.

What's NOT Covered

❌ Diff algorithm - Validated by C tests in c-diff-core/tests/ (3,490 lines) ❌ Visual correctness - Manual testing required