Test-Driven Design Document: Redstone Circuit Simulator

1. Unit Tests for Components

1.1 Redstone Wire Tests

• Power Level Transmission: Verify wire transmits exact power level from source
• Signal Decay: Confirm power decreases by 1 per block traversed
• Maximum Length: Test that signal terminates after 15 blocks without amplification
• Multiple Inputs: Verify wire carries highest power level when receiving multiple inputs
• Connection Patterns: Test all possible connection configurations (straight, corners, T-junctions, crossings)

1.2 Power Source Tests

• Button Functionality:
  • Verify button generates correct power level (15)
  • Confirm button deactivates after configured duration
  • Test button reactivation after use
• Switch/Lever Tests:
  • Verify switch toggles between on/off states
  • Confirm switch maintains state between simulation cycles
  • Test power output level consistency

1.3 Redstone Torch Tests

• Power Generation: Verify unpowered torch outputs power level 15
• Inversion Logic: Confirm torch turns off when its attachment block is powered
• Burnout Mechanics: Test torch temporarily deactivates after rapid toggling
• Recovery: Verify torch recovers from burnout after appropriate delay
• Attachment Configurations: Test all valid torch placement positions

1.4 Repeater Tests

• Signal Restoration: Verify repeater restores any input signal to level 15
• Delay Accuracy: Test each delay setting (1-4 ticks) functions correctly
• Directional Behavior: Confirm signal passes only in forward direction
• Lock Functionality: Verify repeater locks when side input is powered
• Power Requirements: Test minimum power level required for activation

1.5 Transistor Tests

• Basic Functionality: Verify output signal passes only when control input is powered
• Signal Strength: Test output strength matches input strength when active
• Logic Modes: Confirm each logic mode (AND/OR/XOR) functions correctly
• Response Time: Verify activation/deactivation timing is consistent

2. Integration Tests

2.1 Signal Propagation Tests

• Multi-Component Paths: Test signal correctly traverses through multiple component types
• Branch Behavior: Verify signal branches properly at junctions
• Complex Routing: Test signal routing through complex component arrangements
• Timing Consistency: Verify signals propagate with consistent timing across identical paths

2.2 Circuit Pattern Tests

• Clock Circuits: Test various redstone clock designs function correctly
• Logic Gates: Verify AND, OR, NOT, XOR, NAND, NOR gates work as expected
• Memory Cells: Test RS-NOR latches and other memory elements maintain state
• Pulse Circuits: Verify pulse limiters, extenders, and one-shot circuits function correctly

2.3 Edge Case Tests

• High Density Circuits: Test performance with densely packed components
• Update Order: Verify component update sequence matches expected behavior
• Signal Race Conditions: Test circuits with timing-sensitive behavior
• Loop Handling: Verify circuits with feedback loops function correctly

3. System Tests

3.1 Grid Environment Tests

• Grid Boundaries: Test behavior at grid edges
• Component Placement: Verify rules for valid/invalid component placement
• Grid Scaling: Test performance with various grid sizes

3.2 Simulation Control Tests

• Real-time Operation: Verify continuous simulation runs at correct speed
• Step Mode: Test single-tick advancement functions correctly
• Speed Control: Verify simulation speed adjustments work as expected
• Pause/Resume: Test simulation state is preserved when paused

3.3 UI Functionality Tests

• Component Selection: Verify all components can be selected and placed
• Editing Operations: Test copy, paste, delete, rotate functions
• Selection Tools: Verify area selection tools function correctly
• View Controls: Test pan, zoom, and navigation controls

4. Persistence Tests

4.1 Save/Load Tests

• Circuit Preservation: Verify all component properties are saved and restored
• State Persistence: Test that powered states are correctly preserved
• File Format Integrity: Verify resistance to file corruption
• Backward Compatibility: Test loading circuits from previous versions

4.2 Export/Import Tests

• Image Export: Verify circuit diagrams are generated correctly
• Circuit Sharing: Test sharing mechanisms function properly

5. Performance Tests

5.1 Load Testing

• Large Circuit Performance: Measure update rate with circuits of increasing size
• Component Density: Test performance with varying component densities
• Memory Usage: Monitor memory consumption during extended operation

5.2 Stress Tests

• Rapid Input Changes: Test behavior with rapidly changing input signals
• Maximum Components: Verify stability with maximum supported component count
• Long-Duration Simulation: Test stability over extended operation periods

6. Regression Test Suite

• Component Interaction Matrix: Systematic tests of all possible component interactions
• Known Circuit Designs: Library of reference circuits with expected behaviors
• Bug Reproduction Cases: Tests that verify specific bug fixes remain resolved

7. User Acceptance Tests

• Tutorial Completion: Verify users can complete guided tutorial tasks
• Circuit Construction: Test users can build basic functional circuits
• Tool Usability: Measure time required to perform common operations
• Learning Curve: Assess new user ability to understand simulation behavior

Each test should include specific inputs, expected outputs, and acceptance criteria to ensure consistent evaluation of simulator functionality.