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MOCK_STELLAR_TEST_SCENARIOS.md

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Mock Stellar Service - Test Scenarios

Scenario 1: Happy Path - Complete Donation Flow

test('complete donation flow', async () => {
  const service = new MockStellarService();
  
  // Create donor and recipient
  const donor = await service.createWallet();
  const recipient = await service.createWallet();
  
  // Fund both accounts
  await service.fundTestnetWallet(donor.publicKey);
  await service.fundTestnetWallet(recipient.publicKey);
  
  // Send donation
  const result = await service.sendDonation({
    sourceSecret: donor.secretKey,
    destinationPublic: recipient.publicKey,
    amount: '50.00',
    memo: 'Support for project',
  });
  
  // Verify transaction
  expect(result.transactionId).toBeDefined();
  expect(result.status).toBe('confirmed');
  
  // Check balances
  const donorBalance = await service.getBalance(donor.publicKey);
  const recipientBalance = await service.getBalance(recipient.publicKey);
  
  expect(parseFloat(donorBalance.balance)).toBe(9950.0);
  expect(parseFloat(recipientBalance.balance)).toBe(10050.0);
});

Scenario 2: Error Handling - Unfunded Destination

test('reject payment to unfunded account', async () => {
  const service = new MockStellarService();
  
  const donor = await service.createWallet();
  const recipient = await service.createWallet();
  
  // Only fund donor
  await service.fundTestnetWallet(donor.publicKey);
  
  // Attempt to send to unfunded account
  await expect(
    service.sendDonation({
      sourceSecret: donor.secretKey,
      destinationPublic: recipient.publicKey,
      amount: '50.00',
      memo: 'Test',
    })
  ).rejects.toThrow('Destination account is not funded');
});

Scenario 3: Error Handling - Insufficient Balance

test('reject payment exceeding balance minus reserve', async () => {
  const service = new MockStellarService();
  
  const donor = await service.createWallet();
  const recipient = await service.createWallet();
  
  await service.fundTestnetWallet(donor.publicKey);
  await service.fundTestnetWallet(recipient.publicKey);
  
  // Try to send all funds (violates 1 XLM reserve)
  await expect(
    service.sendDonation({
      sourceSecret: donor.secretKey,
      destinationPublic: recipient.publicKey,
      amount: '10000.00',
      memo: 'Test',
    })
  ).rejects.toThrow('Account must maintain minimum balance');
});

Scenario 4: Network Simulation - Delays

test('handle network delays gracefully', async () => {
  const service = new MockStellarService({ networkDelay: 200 });
  
  const startTime = Date.now();
  
  const wallet = await service.createWallet();
  await service.fundTestnetWallet(wallet.publicKey);
  const balance = await service.getBalance(wallet.publicKey);
  
  const endTime = Date.now();
  const totalTime = endTime - startTime;
  
  // Should take at least 600ms (3 operations × 200ms)
  expect(totalTime).toBeGreaterThanOrEqual(600);
  expect(balance.balance).toBe('10000.0000000');
});

Scenario 5: Network Simulation - Random Failures

test('retry on random failures', async () => {
  const service = new MockStellarService({ failureRate: 0.5 });
  
  const donor = await service.createWallet();
  const recipient = await service.createWallet();
  
  // Fund with retries
  let funded = false;
  let attempts = 0;
  
  while (!funded && attempts < 5) {
    try {
      await service.fundTestnetWallet(donor.publicKey);
      funded = true;
    } catch (error) {
      attempts++;
      await new Promise(resolve => setTimeout(resolve, 100));
    }
  }
  
  expect(funded).toBe(true);
  expect(attempts).toBeGreaterThan(0); // Should have failed at least once
});

Scenario 6: Rate Limiting

test('handle rate limiting with backoff', async () => {
  const service = new MockStellarService({ rateLimit: 3 });
  
  const wallet = await service.createWallet();
  await service.fundTestnetWallet(wallet.publicKey);
  
  const results = [];
  
  for (let i = 0; i < 5; i++) {
    try {
      const balance = await service.getBalance(wallet.publicKey);
      results.push({ success: true, balance });
    } catch (error) {
      if (error.message.includes('Rate limit')) {
        // Wait and retry
        await new Promise(resolve => setTimeout(resolve, 1000));
        const balance = await service.getBalance(wallet.publicKey);
        results.push({ success: true, balance, retried: true });
      } else {
        throw error;
      }
    }
  }
  
  expect(results.length).toBe(5);
  expect(results.some(r => r.retried)).toBe(true);
});

Scenario 7: Transaction History

test('track complete transaction history', async () => {
  const service = new MockStellarService();
  
  const donor = await service.createWallet();
  const recipient1 = await service.createWallet();
  const recipient2 = await service.createWallet();
  
  await service.fundTestnetWallet(donor.publicKey);
  await service.fundTestnetWallet(recipient1.publicKey);
  await service.fundTestnetWallet(recipient2.publicKey);
  
  // Make multiple donations
  await service.sendDonation({
    sourceSecret: donor.secretKey,
    destinationPublic: recipient1.publicKey,
    amount: '100.00',
    memo: 'First donation',
  });
  
  await service.sendDonation({
    sourceSecret: donor.secretKey,
    destinationPublic: recipient2.publicKey,
    amount: '200.00',
    memo: 'Second donation',
  });
  
  // Check donor history
  const history = await service.getTransactionHistory(donor.publicKey);
  
  expect(history.length).toBe(2);
  expect(history[0].memo).toBe('Second donation'); // Most recent first
  expect(history[1].memo).toBe('First donation');
  
  // Verify amounts
  const totalSent = history.reduce((sum, tx) => sum + parseFloat(tx.amount), 0);
  expect(totalSent).toBe(300.0);
});

Scenario 8: Real-time Streaming

test('stream transactions in real-time', async () => {
  const service = new MockStellarService();
  
  const donor = await service.createWallet();
  const recipient = await service.createWallet();
  
  await service.fundTestnetWallet(donor.publicKey);
  await service.fundTestnetWallet(recipient.publicKey);
  
  // Set up stream listener
  const receivedTransactions = [];
  const unsubscribe = service.streamTransactions(
    recipient.publicKey,
    (tx) => receivedTransactions.push(tx)
  );
  
  // Send multiple donations
  await service.sendDonation({
    sourceSecret: donor.secretKey,
    destinationPublic: recipient.publicKey,
    amount: '50.00',
    memo: 'Donation 1',
  });
  
  await service.sendDonation({
    sourceSecret: donor.secretKey,
    destinationPublic: recipient.publicKey,
    amount: '75.00',
    memo: 'Donation 2',
  });
  
  // Verify streaming
  expect(receivedTransactions.length).toBe(2);
  expect(receivedTransactions[0].memo).toBe('Donation 1');
  expect(receivedTransactions[1].memo).toBe('Donation 2');
  
  unsubscribe();
});

Scenario 9: Validation - Invalid Keys

test('reject invalid key formats', async () => {
  const service = new MockStellarService();
  
  // Invalid public key
  await expect(
    service.getBalance('INVALID_KEY')
  ).rejects.toThrow('Invalid Stellar public key format');
  
  // Invalid secret key
  const recipient = await service.createWallet();
  await service.fundTestnetWallet(recipient.publicKey);
  
  await expect(
    service.sendDonation({
      sourceSecret: 'INVALID_SECRET',
      destinationPublic: recipient.publicKey,
      amount: '10.00',
      memo: 'Test',
    })
  ).rejects.toThrow('Invalid Stellar secret key format');
});

Scenario 10: Validation - Amount Precision

test('enforce 7 decimal place precision', async () => {
  const service = new MockStellarService();
  
  const donor = await service.createWallet();
  const recipient = await service.createWallet();
  
  await service.fundTestnetWallet(donor.publicKey);
  await service.fundTestnetWallet(recipient.publicKey);
  
  // Too many decimal places
  await expect(
    service.sendDonation({
      sourceSecret: donor.secretKey,
      destinationPublic: recipient.publicKey,
      amount: '10.12345678', // 8 decimals
      memo: 'Test',
    })
  ).rejects.toThrow('Amount cannot have more than 7 decimal places');
  
  // Valid precision
  const result = await service.sendDonation({
    sourceSecret: donor.secretKey,
    destinationPublic: recipient.publicKey,
    amount: '10.1234567', // 7 decimals
    memo: 'Test',
  });
  
  expect(result.transactionId).toBeDefined();
});

Scenario 11: Concurrent Operations

test('handle concurrent donations safely', async () => {
  const service = new MockStellarService();
  
  const donor1 = await service.createWallet();
  const donor2 = await service.createWallet();
  const recipient = await service.createWallet();
  
  await service.fundTestnetWallet(donor1.publicKey);
  await service.fundTestnetWallet(donor2.publicKey);
  await service.fundTestnetWallet(recipient.publicKey);
  
  // Send concurrent donations
  const results = await Promise.all([
    service.sendDonation({
      sourceSecret: donor1.secretKey,
      destinationPublic: recipient.publicKey,
      amount: '100.00',
      memo: 'From donor 1',
    }),
    service.sendDonation({
      sourceSecret: donor2.secretKey,
      destinationPublic: recipient.publicKey,
      amount: '200.00',
      memo: 'From donor 2',
    }),
  ]);
  
  expect(results.length).toBe(2);
  expect(results[0].transactionId).not.toBe(results[1].transactionId);
  
  // Verify final balance
  const balance = await service.getBalance(recipient.publicKey);
  expect(parseFloat(balance.balance)).toBe(10300.0); // 10000 + 100 + 200
});

Scenario 12: Transaction Verification

test('verify transaction by hash', async () => {
  const service = new MockStellarService();
  
  const donor = await service.createWallet();
  const recipient = await service.createWallet();
  
  await service.fundTestnetWallet(donor.publicKey);
  await service.fundTestnetWallet(recipient.publicKey);
  
  const result = await service.sendDonation({
    sourceSecret: donor.secretKey,
    destinationPublic: recipient.publicKey,
    amount: '50.00',
    memo: 'Verified donation',
  });
  
  // Verify transaction
  const verification = await service.verifyTransaction(result.transactionId);
  
  expect(verification.verified).toBe(true);
  expect(verification.status).toBe('confirmed');
  expect(verification.transaction.amount).toBe('50.0000000');
  expect(verification.transaction.memo).toBe('Verified donation');
  expect(verification.transaction.fee).toBe('0.0000100');
  expect(verification.transaction.sequence).toBeDefined();
});

Running These Tests

Save any scenario to a test file and run:

npm test -- your-test-file.test.js

Or add to existing test suite:

describe('Real-world Scenarios', () => {
  // Add scenarios here
});

Tips for Writing Tests

  1. Always create fresh service instance per test
  2. Fund both source and destination before transactions
  3. Use realistic amounts with proper decimal places
  4. Test both success and failure paths
  5. Verify balances after operations
  6. Check transaction history for completeness
  7. Test concurrent operations for race conditions
  8. Simulate network conditions for robustness