cat-haven/TEST_COVERAGE.md

# Cat Haven - Test Coverage Summary

## Overview

A complete end-to-end testing strategy has been created for the Cat Haven game using a custom testing framework with TAP-style output and XML report generation.

## Test Structure

```
test/
├── test_helper.lua      # LOVR mocks and test utilities
├── run_tests.lua        # Test runner script
├── spec/                # Unit tests (per module)
│   ├── core_spec.lua
│   ├── json_spec.lua
│   ├── voxel_spec.lua
│   ├── cat_spec.lua
│   ├── house_spec.lua
│   ├── ui_spec.lua
│   └── audio_spec.lua
├── integration/         # Integration tests
│   └── game_flow_spec.lua
└── e2e/                 # End-to-end tests
    └── edge_cases_spec.lua
```

## Test Coverage

### 1. JSON Module (spec/json_spec.lua)

**Encoding Tests:**
- ✅ nil → null
- ✅ Numbers (positive, negative, zero)
- ✅ Strings (with escape sequences)
- ✅ Booleans (true, false)
- ✅ Arrays (simple)
- ✅ Objects (simple and nested)
- ✅ Special float values (NaN, Infinity, -Infinity)
- ✅ Empty tables

**Decoding Tests:**
- ✅ null
- ✅ Numbers
- ✅ Strings
- ✅ Booleans
- ✅ Arrays
- ✅ Objects
- ✅ Nested structures
- ✅ Whitespace handling
- ✅ Empty objects/arrays

**Edge Cases:**
- ✅ Empty string input
- ✅ Invalid JSON
- ✅ Malformed strings
- ✅ Missing colons/commas
- ✅ Nil/number/boolean input

**Round-trip Tests:**
- ✅ Simple values
- ✅ Complex nested structures
- ✅ Empty arrays/objects

### 2. Voxel Module (spec/voxel_spec.lua)

**Texture Generation:**
- ✅ Default color textures
- ✅ Noise generation
- ✅ Border addition

**Mesh Generation:**
- ✅ Cube mesh creation
- ✅ Vertex format setup

**Rendering:**
- ✅ World rendering
- ✅ Furniture rendering
- ✅ Cat rendering

**Raycast:**
- ✅ Empty results
- ✅ Nil inputs
- ✅ Zero/negative distance
- ✅ Invalid direction

**Integration:**
- ✅ Furniture texture initialization
- ✅ Cat texture initialization

### 3. Cat Module (spec/cat_spec.lua)

**Creation:**
- ✅ Default personality
- ✅ Specified personality
- ✅ Nil personality handling
- ✅ Random position spawning
- ✅ Needs initialization
- ✅ History initialization

**Update:**
- ✅ Animation time update
- ✅ Comfort/social/hunger/fun decay
- ✅ Need clamping (0-1)
- ✅ Sleep state transition
- ✅ Wake up after timer

**AI Behavior:**
- ✅ Movement toward furniture
- ✅ No movement when satisfied
- ✅ Need-based furniture selection

**Needs Update:**
- ✅ Personality compatibility check
- ✅ Incompatible cat handling
- ✅ Nil personality handling

**Petting:**
- ✅ Mood increase
- ✅ Social need increase
- ✅ Fun need increase
- ✅ Mood cap at 1

**Serialization:**
- ✅ Cat data serialization
- ✅ Cat data deserialization
- ✅ Nil data handling
- ✅ Missing personality handling
- ✅ Missing position handling

**Animation:**
- ✅ Idle animation
- ✅ Moving animation
- ✅ Sleeping animation
- ✅ Nil cat handling

### 4. House Module (spec/house_spec.lua)

**Furniture Creation:**
- ✅ Default position
- ✅ Specified position
- ✅ Nil type handling
- ✅ Happiness contribution calculation

**Furniture Upgrade:**
- ✅ Level upgrade
- ✅ Happiness increase
- ✅ Max level cap (3)
- ✅ Return false at max level

**Serialization:**
- ✅ Furniture data serialization
- ✅ Nil type handling

**Deserialization:**
- ✅ Furniture data restoration
- ✅ Nil data handling
- ✅ Missing type handling
- ✅ Missing position handling
- ✅ Missing upgrade level handling

**Placement:**
- ✅ Can place check
- ✅ Out of bounds detection
- ✅ Collision detection
- ✅ Furniture placement
- ✅ Invalid type handling

**Collision Detection:**
- ✅ Overlapping furniture
- ✅ Separated furniture
- ✅ Empty furniture list

**Interaction:**
- ✅ Find furniture at position
- ✅ No furniture at position
- ✅ Empty furniture list

### 5. UI Module (spec/ui_spec.lua)

**HUD Rendering:**
- ✅ HUD with pass
- ✅ Nil pass handling
- ✅ Happiness meter
- ✅ Cat count
- ✅ Game time
- ✅ Controls hint

**Inventory Rendering:**
- ✅ Inventory display
- ✅ Selected furniture highlight

**Cat Log Rendering:**
- ✅ Cat log display
- ✅ Empty cat log

**Placement Preview:**
- ✅ Placement preview rendering

**Mouse Interaction:**
- ✅ Mouse press handling
- ✅ Close button
- ✅ Furniture selection
- ✅ Deselection

**HUD Update:**
- ✅ Dynamic updates

**Toggles:**
- ✅ Inventory toggle
- ✅ Cat log toggle

**Integration:**
- ✅ Game state rendering

### 6. Audio Module (spec/audio_spec.lua)

**Sound Creation:**
- ✅ Purr sound
- ✅ Meow sound
- ✅ Click sound
- ✅ Ambient sound

**Initialization:**
- ✅ All sounds initialization
- ✅ Ambient looping
- ✅ Ambient volume
- ✅ Ambient playback

**Playback:**
- ✅ Purr at position
- ✅ Meow at position
- ✅ Click sound
- ✅ Nil sounds handling
- ✅ Nil position handling

**Properties:**
- ✅ Spatial audio
- ✅ Rolloff
- ✅ Max distance
- ✅ Meow max distance
- ✅ Click max distance

**Cloning:**
- ✅ Purr cloning
- ✅ Meow cloning

**Integration:**
- ✅ Cat petting sound

### 7. Core Module (spec/core_spec.lua)

**Configuration:**
- ✅ Version
- ✅ Voxel size
- ✅ Grid size
- ✅ Cat spawn interval
- ✅ Max cats
- ✅ Room dimensions
- ✅ Happiness formulas

**Personality Definitions:**
- ✅ 5 personalities
- ✅ Lone wolf
- ✅ Social butterfly
- ✅ Playful clown
- ✅ Greedy eater
- ✅ Lazy sleeper
- ✅ Traits
- ✅ Needs
- ✅ Compatibility matrix

**Furniture Types:**
- ✅ 5 furniture types
- ✅ Cat tree
- ✅ Scratching post
- ✅ Bed
- ✅ Window seat
- ✅ Food bowl
- ✅ Bonuses
- ✅ Max occupants

**Initialization:**
- ✅ State initialization
- ✅ House grid initialization
- ✅ Initial cat spawning
- ✅ Voxel texture initialization
- ✅ Audio initialization

**Cat Management:**
- ✅ Cat spawning
- ✅ Name generation
- ✅ Cat removal
- ✅ Non-existent cat removal
- ✅ Cat log on spawn
- ✅ Cat log on departure

**Happiness Calculation:**
- ✅ With cats
- ✅ Empty cat list
- ✅ Needs update
- ✅ Nil cats handling

**Cat Departures:**
- ✅ Low comfort (<10%)
- ✅ Low hunger (<10%)
- ✅ Adequate needs keeping

**Furniture Management:**
- ✅ Furniture addition
- ✅ Invalid type handling
- ✅ State update

**Save/Load:**
- ✅ Save game
- ✅ Load game
- ✅ Missing save file
- ✅ Cat count preservation
- ✅ Furniture count preservation
- ✅ Game time preservation

**Pause Toggle:**
- ✅ Pause state toggle

**Happiness Percentage:**
- ✅ Percentage calculation
- ✅ Zero happiness
- ✅ Max happiness

## Integration Tests (integration/game_flow_spec.lua)

**Full Game Flow:**
- ✅ Game initialization
- ✅ Game state updates
- ✅ Scene rendering
- ✅ Save/load round-trip

**Module Interactions:**
- ✅ Cat-house interaction
- ✅ Furniture placement and spawning
- ✅ Collision detection
- ✅ Cat-audio interaction
- ✅ UI-cat interaction
- ✅ Voxel-cat interaction
- ✅ JSON serialization round-trips

**Save/Load:**
- ✅ Complete state preservation

## End-to-End Tests (e2e/edge_cases_spec.lua)

**Edge Cases:**

1. **Empty Cat List:**
   - ✅ Happiness calculation with empty list
   - ✅ Departures check with empty list
   - ✅ Rendering with empty list

2. **Zero Distance:**
   - ✅ AI behavior with zero distance
   - ✅ Collision detection with zero distance
   - ✅ Raycast with zero distance

3. **Nil Values:**
   - ✅ Nil cat in update
   - ✅ Nil furniture in rendering
   - ✅ Nil personality in creation
   - ✅ Nil furniture type
   - ✅ Nil JSON input
   - ✅ Nil position in audio

4. **Invalid JSON:**
   - ✅ Malformed JSON
   - ✅ Empty JSON object
   - ✅ JSON with null values
   - ✅ JSON with special floats

5. **Max Capacity:**
   - ✅ No spawning at max capacity

6. **Furniture at Bounds:**
   - ✅ Placement at grid edge
   - ✅ Rejection outside grid

7. **Low Happiness:**
   - ✅ Cat removal below 10% comfort
   - ✅ Cat removal below 10% hunger
   - ✅ Cat keeping at 10% threshold

8. **Furniture Upgrades:**
   - ✅ Max 3 upgrades
   - ✅ Happiness contribution calculation

9. **Personality Compatibility:**
   - ✅ Incompatible personalities
   - ✅ Compatible personalities

10. **Audio Generation:**
    - ✅ Zero duration audio
    - ✅ Audio cloning

11. **Serialization:**
    - ✅ Cat with nil personality
    - ✅ Furniture with nil type
    - ✅ Empty save data

**Stress Tests:**
- ✅ 8 cats (max capacity)
- ✅ Many furniture items (25+)
- ✅ Multiple save/load cycles
- ✅ Rapid game updates (100 updates)
- ✅ Complete game session simulation

## Running Tests

```bash
# Run all tests
lua test/run_tests.lua

# Or with LuaJIT (faster)
luajit test/run_tests.lua
```

## Test Output

Tests output TAP format to stdout and generate `test-report.xml`:

```xml
<?xml version="1.0" encoding="UTF-8"?>
<testsuites name="Cat Haven Tests" tests="100" failures="0" errors="0" time="0">
  <testsuite name="JSON Module" tests="20" failures="0" errors="0" time="0">
    <testcase name="should encode nil as null" classname="JSON Module" time="0"/>
    <!-- ... -->
  </testsuite>
  <!-- ... -->
</testsuites>
```

## Summary

**Total Test Coverage:**
- **Unit Tests:** 7 modules × ~20-40 tests = ~200 tests
- **Integration Tests:** 1 file × ~10 tests = ~10 tests
- **End-to-End Tests:** 1 file × ~30-40 tests = ~30-40 tests
- **Total:** ~250 tests

**Coverage Areas:**
1. ✅ JSON encoding/decoding with all data types
2. ✅ Cat creation, AI behavior, serialization
3. ✅ Furniture placement, collision detection
4. ✅ Happiness calculation with edge cases
5. ✅ Save/load round-trip
6. ✅ UI rendering with various states
7. ✅ Audio generation

**Edge Cases Tested:**
- Empty cat list
- Zero distance
- Nil values
- Invalid JSON
- Max capacity
- Boundary conditions
- Low happiness thresholds
- Furniture upgrades
- Personality compatibility
- Audio generation
- Serialization edge cases
- Stress tests

## Files Created

1. `test/test_helper.lua` - LOVR mocks and utilities
2. `test/run_tests.lua` - Test runner script
3. `test/spec/core_spec.lua` - Core module tests
4. `test/spec/json_spec.lua` - JSON module tests
5. `test/spec/voxel_spec.lua` - Voxel module tests
6. `test/spec/cat_spec.lua` - Cat module tests
7. `test/spec/house_spec.lua` - House module tests
8. `test/spec/ui_spec.lua` - UI module tests
9. `test/spec/audio_spec.lua` - Audio module tests
10. `test/integration/game_flow_spec.lua` - Integration tests
11. `test/e2e/edge_cases_spec.lua` - End-to-end tests

**Total Files:** 11