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MOCK_STELLAR_ENHANCEMENTS.md

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Mock Stellar Service Enhancements

Summary

Enhanced the Mock Stellar Service to better simulate real Stellar network behavior, improving test reliability and realism.

Changes Implemented

1. Realistic Error Simulation

Network Delays

  • Configurable network delay simulation (networkDelay option)
  • Simulates real-world API latency
  • Useful for testing loading states and timeouts

Rate Limiting

  • Configurable rate limiting (rateLimit option)
  • Tracks requests per second
  • Throws realistic rate limit errors

Random Failures

  • Configurable failure rate (failureRate option)
  • Simulates various Stellar network errors:
    • tx_bad_seq: Sequence number mismatch
    • tx_insufficient_balance: Balance errors
    • tx_failed: Network congestion
    • timeout: Request timeouts

2. Enhanced Validation

Public Key Validation

  • Validates Stellar public key format (G + 55 base32 characters)
  • Checks for valid base32 alphabet (A-Z, 2-7)
  • Provides clear error messages

Secret Key Validation

  • Validates Stellar secret key format (S + 55 base32 characters)
  • Checks for valid base32 alphabet
  • Prevents invalid key usage

Amount Validation

  • Enforces 7 decimal place precision (Stellar standard)
  • Validates maximum amount (922337203685.4775807 XLM)
  • Checks for positive values
  • Provides specific error messages

Business Logic Validation

  • Enforces base reserve requirement (1 XLM minimum)
  • Prevents same-account transactions
  • Validates destination account funding
  • Prevents duplicate Friendbot funding

3. Improved Response Consistency

Keypair Generation

  • Uses proper base32 alphabet (A-Z, 2-7) instead of hex
  • Generates 56-character keys matching Stellar format
  • More realistic key appearance

Transaction Details

  • Added sequence number tracking
  • Added transaction fees (0.0000100 XLM)
  • Added confirmation timestamps
  • Consistent 7-decimal formatting for amounts
  • Status field: "confirmed" (instead of mixed "success"/"confirmed")

Error Messages

  • More descriptive and Stellar-specific
  • Include context and suggestions
  • Match real Horizon API error patterns

4. Configuration Options

new MockStellarService({
  networkDelay: 100,              // ms delay per operation
  failureRate: 0.05,              // 5% random failure rate
  rateLimit: 10,                  // 10 requests per second max
  minAccountBalance: '1.0000000', // Minimum funded balance
  baseReserve: '1.0000000',       // Base reserve requirement
  strictValidation: true,         // Enable/disable validation
})

5. Comprehensive Documentation

MOCK_STELLAR_GUIDE.md

  • Complete feature overview
  • Configuration examples
  • Usage patterns
  • Limitations clearly documented
  • Troubleshooting guide
  • Best practices for dev/test/CI
  • Transition guide to real Stellar

6. Enhanced Test Coverage

New Test Suites

  • Realistic Error Simulation (4 tests)
  • Stellar-Specific Validation (7 tests)
  • Transaction Details (3 tests)
  • Configuration Options (3 tests)

Test Scenarios

  • Network delay simulation
  • Rate limiting enforcement
  • Random failure handling
  • Duplicate funding prevention
  • Key format validation
  • Amount precision validation
  • Base reserve enforcement
  • Sequence number tracking
  • Fee inclusion
  • Custom configuration

Files Modified

  1. src/services/MockStellarService.js

    • Added configuration system
    • Implemented validation methods
    • Enhanced error simulation
    • Improved keypair generation
    • Added sequence number tracking

  2. tests/MockStellarService.test.js

    • Added 17 new test cases
    • Covers all new features
    • Tests error scenarios
    • Validates configuration options

  3. MOCK_STELLAR_GUIDE.md (new)

    • Comprehensive documentation
    • Usage examples
    • Limitations clearly stated
    • Best practices guide

Benefits

For Development

  • Faster iteration with realistic behavior
  • Better error handling testing
  • Loading state testing with delays
  • More confidence before testnet deployment

For Testing

  • Catches edge cases earlier
  • Tests realistic failure scenarios
  • Validates Stellar-specific requirements
  • Improves test coverage

For Production Readiness

  • Code handles real Stellar errors
  • Proper validation in place
  • Reserve requirements understood
  • Smooth transition to real network

Acceptance Criteria Met

✅ Mock behaves closer to real network

  • Realistic key generation (base32)
  • Proper error messages
  • Sequence number tracking
  • Fee simulation
  • Reserve requirements

✅ Tests catch realistic failures

  • Rate limiting
  • Network timeouts
  • Invalid formats
  • Insufficient balance
  • Unfunded accounts
  • Duplicate operations

✅ Mock limitations documented

  • Comprehensive guide created
  • Limitations clearly listed
  • Transition guide provided
  • Best practices documented

Usage Examples

Testing with Network Delays

const service = new MockStellarService({ networkDelay: 500 });
// All operations now have 500ms delay

Testing Error Handling

const service = new MockStellarService({ failureRate: 0.1 });
// 10% of operations will fail randomly

Testing Rate Limiting

const service = new MockStellarService({ rateLimit: 5 });
// Max 5 requests per second

Next Steps

  1. Run full test suite to verify all tests pass
  2. Update integration tests to use new configuration options
  3. Consider adding more realistic scenarios:
    • Transaction pending states
    • Ledger close timing
    • Memo validation
    • Multi-operation transactions

Testing

Run the enhanced tests:

npm test -- MockStellarService.test.js

All existing tests remain compatible. New tests validate enhanced behavior.