czlonkowski 36e02c68d3 test: add comprehensive integration tests for array index preservation ...

Added 4 critical integration tests to prevent regression of the
production-breaking array index corruption bug in multi-output nodes.

Tests verify against real n8n API:

1. IF Node - Empty array preservation when removing connections
   - Removes true branch connection
   - Verifies empty array at index 0
   - Verifies false branch stays at index 1 (not shifted)

2. Switch Node - Remove first case (MOST CRITICAL)
   - Tests exact bug scenario that was production-breaking
   - Removes case 0
   - Verifies cases 1, 2, 3 stay at original indices

3. Switch Node - Sequential operations
   - Complex scenario: rewire, add, remove in sequence
   - Verifies indices maintained throughout operations
   - Tests empty arrays preserved at intermediate positions

4. Filter Node - Rewiring connections
   - Tests kept/discarded outputs (2-output node)
   - Rewires one output
   - Verifies other output unchanged

All tests validate actual workflow structure from n8n API to ensure
our fix (only remove trailing empty arrays) works correctly.

Coverage:
- Total: 174 tests (158 unit + 16 integration)
- All tests passing ✅
- Integration tests provide regression protection

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-10-06 09:45:53 +02:00

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