---
name: Test Coverage Summary for modules/core
description: Complete test suite coverage for all chess logic components in NowChessSystems core module
type: reference
---

## Test Suite Overview

Comprehensive test coverage added for the NowChessSystems core chess module across all components.

### Test Files Added

1. **GameControllerTest.scala** (15 tests)
   - Valid/invalid move handling
   - Capture detection
   - Turn switching
   - Piece color validation
   - Board state preservation

2. **PieceUnicodeTest.scala** (18 tests)
   - All 12 piece types (6 white, 6 black) unicode mappings
   - Unicode distinctness verification
   - Convenience constructor validation
   - Roundtrip consistency

3. **RendererExtendedTest.scala** (22 tests)
   - Empty board rendering
   - Single/multiple piece placement
   - All piece types display
   - Board dimension labels
   - Piece placement accuracy
   - ANSI color codes
   - Output consistency
   - Pawn position accuracy

4. **ParserExtendedTest.scala** (41 tests)
   - Valid file/rank/move parsing
   - Whitespace handling
   - Case sensitivity
   - Boundary validation
   - Length validation
   - Special character rejection
   - Edge cases (very long strings, invalid formats)

5. **MoveValidatorExtendedTest.scala** (45 tests)
   - Pawn movement (forward, double-push, captures, edge cases)
   - Knight movement (L-shapes, corner behavior, jumps)
   - Bishop movement (diagonals, blocking, captures)
   - Rook movement (orthogonal, blocking, captures)
   - Queen movement (combined rook+bishop)
   - King movement (one-square moves, corners)
   - legalTargets consistency with isLegal

6. **MainTest.scala** (3 tests)
   - Entry point verification

### Existing Tests (Not Modified)

- ModelTest.scala: 9 tests
- ParserTest.scala: 8 tests
- RendererTest.scala: 6 tests
- MoveValidatorTest.scala: 25 tests

### Total Test Count

**144 tests** covering all major source files in modules/core:
- All test methods properly typed `: Unit` for JUnit 5 compatibility
- No use of `implicit` — all use modern Scala 3 `given`/`using`
- No use of `null` — proper use of `Option`/`Either`
- Jakarta annotations only (no javax.*)

### Coverage Areas

**Complete coverage of:**
- Board representation and movement
- All piece types and their movement rules
- Move validation logic
- Input parsing and validation
- Board rendering with ANSI colors
- Unicode piece representations
- Edge cases and boundary conditions
- State preservation and immutability

### Build Status

All tests pass with `./gradlew :modules:core:test`:
- ✓ No compilation errors
- ✓ No test failures
- ✓ JaCoCo coverage reporting enabled
- ✓ Scala 3 style compliance (fixed varargs, wildcards)