# 79 - Router E2E Test Coverage Extension (TASK-040)

**Date:** 2025-12-02
**Task:** [TASK-040](../_TASKS/TASK-040_Router_E2E_Test_Coverage_Extension.md)

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## Summary

Extended Router Supervisor E2E test coverage from 38 to 74 tests (+36 new tests). Added comprehensive tests for Error Firewall, Tool Override Engine, Intent Classifier, and edge cases.

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## New Test Files

| File | Tests | Coverage |
|------|-------|----------|
| `test_error_firewall.py` | 7 | Blocking, mode auto-fix, selection auto-fix, parameter clamping |
| `test_tool_override.py` | 6 | Pattern-based override (phone, tower), configuration, execution |
| `test_intent_classifier.py` | 8 | Multilingual (EN/PL/DE), fallback, prompt influence |
| `test_edge_cases.py` | 15 | No object, multiple selected, mode transitions, invalid params |

**Total new tests:** 36

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## Test Coverage by Component

### Error Firewall (7 tests)
- `test_delete_on_empty_scene_is_blocked` - Rule: `delete_no_object`
- `test_sculpt_tool_in_object_mode_adds_mode_switch` - Rule: `sculpt_in_wrong_mode`
- `test_bevel_without_selection_adds_select_all` - Rule: `bevel_no_selection`
- `test_inset_without_selection_adds_select_all` - Rule: `inset_no_selection`
- `test_inset_thickness_clamped` - Parameter clamping
- `test_extrude_depth_not_clamped_when_reasonable` - Reasonable params unchanged
- `test_firewall_disabled_allows_violations` - Configuration test

### Tool Override Engine (6 tests)
- `test_extrude_on_phone_pattern_may_add_inset` - Phone pattern override
- `test_subdivide_on_tower_pattern_may_add_taper` - Tower pattern override
- `test_extrude_on_cubic_object_no_override` - No override without pattern
- `test_subdivide_on_flat_object_no_tower_override` - No override without pattern
- `test_disabled_override_returns_original_tool` - Configuration test
- `test_overridden_tools_execute_without_error` - Execution verification

### Intent Classifier (8 tests)
- `test_english_prompt_classification` - English prompts
- `test_polish_prompt_classification` - Polish prompts (PL)
- `test_german_prompt_classification` - German prompts (DE)
- `test_unknown_prompt_uses_original_tool` - Gibberish fallback
- `test_empty_prompt_uses_original_tool` - Empty string
- `test_none_prompt_uses_original_tool` - None value
- `test_prompt_with_workflow_keywords` - Workflow trigger
- `test_prompt_affects_context_analysis` - Context influence

### Edge Cases (15 tests)
- `test_mesh_operation_without_object_handles_gracefully` - No active object
- `test_modeling_operation_without_object_handles_gracefully` - No active object
- `test_transform_with_multiple_selected` - Multiple selection
- `test_modifier_with_multiple_selected` - Multiple selection
- `test_edit_mode_tool_from_sculpt_mode` - SCULPT → EDIT transition
- `test_object_mode_tool_from_edit_mode` - EDIT → OBJECT transition
- `test_negative_subdivide_cuts` - Invalid parameter
- `test_zero_bevel_width` - Zero parameter
- `test_extremely_large_extrude_depth` - Extreme parameter
- `test_mesh_tool_on_camera` - Non-mesh object
- `test_mesh_tool_on_light` - Non-mesh object
- `test_tool_sequence_with_intermediate_failure` - Workflow resilience
- `test_cache_invalidation_reflects_scene_changes` - Cache behavior
- `test_prompt_with_unicode_characters` - Unicode handling
- `test_prompt_with_special_characters` - Special chars handling

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## Documentation

- Created `_docs/_ROUTER/IMPLEMENTATION/00-tests-structure.md` - Complete test structure documentation

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## Test Statistics

| Category | Before | After | Change |
|----------|--------|-------|--------|
| E2E Router Tests | 38 | 74 | +36 |
| Unit Router Tests | 561 | 561 | 0 |
| **Total Router Tests** | **599** | **635** | **+36** |

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## Related Files

### Created
- `tests/e2e/router/test_error_firewall.py`
- `tests/e2e/router/test_tool_override.py`
- `tests/e2e/router/test_intent_classifier.py`
- `tests/e2e/router/test_edge_cases.py`
- `_docs/_ROUTER/IMPLEMENTATION/00-tests-structure.md`

### Modified
- `_docs/_TASKS/TASK-040_Router_E2E_Test_Coverage_Extension.md` (status → Done)
- `_docs/_TASKS/README.md` (moved to Done)
