diff --git a/tests/test-1.js b/tests/test-1.js
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+++ b/tests/test-1.js
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+mkdir -p test/models
+touch test/models/GameRound.test.js
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diff --git a/tests/test-2.js b/tests/test-2.js
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+++ b/tests/test-2.js
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+// test/models/GameRound.test.js
+const { expect } = require('chai');
+const sinon = require('sinon');
+const mongoose = require('mongoose');
+const GameRound = require('../../models/GameRound'); // Adjust path as needed
+
+// Mock MongoDB connection (replace with your actual connection string if needed)
+const mockConnection = {
+  once: sinon.stub(),
+  disconnect: sinon.stub(),
+};
+mongoose.connect = sinon.stub().returns(mockConnection);
+
+describe('GameRound Model', () => {
+  let gameRound;
+  beforeEach(async () => {
+    // Create a new game round before each test
+    gameRound = new GameRound({
+      roundId: 'testRound1',
+      status: 'active',
+      startTime: new Date(),
+      crashPoint: 100,
+      seed: 'testSeed',
+      hash: 'testHash',
+    });
+    await gameRound.save();
+  });
+
+  afterEach(async () => {
+    // Clean up after each test
+    await GameRound.deleteMany({});
+  });
+
+  describe('addBet', () => {
+    it('should add a valid bet', async () => {
+      const betData = { playerId: 'player1', username: 'user1', usdAmount: 10, cryptoAmount: 0.01, currency: 'btc', priceAtTime: 1000 };
+      await gameRound.addBet(betData);
+      expect(gameRound.bets).to.have.lengthOf(1);
+      expect(gameRound.totalBets).to.equal(10);
+    });
+
+    it('should add multiple bets', async () => {
+      const betData1 = { playerId: 'player1', username: 'user1', usdAmount: 10, cryptoAmount: 0.01, currency: 'btc', priceAtTime: 1000 };
+      const betData2 = { playerId: 'player2', username: 'user2', usdAmount: 20, cryptoAmount: 0.02, currency: 'eth', priceAtTime: 2000 };
+      await gameRound.addBet(betData1);
+      await gameRound.addBet(betData2);
+      expect(gameRound.bets).to.have.lengthOf(2);
+      expect(gameRound.totalBets).to.equal(30);
+    });
+
+    it('should throw an error for negative bet amount', async () => {
+      const betData = { playerId: 'player1', username: 'user1', usdAmount: -10, cryptoAmount: 0.01, currency: 'btc', priceAtTime: 1000 };
+      await expect(gameRound.addBet(betData)).to.be.rejectedWith(Error, /validation failed/i);
+    });
+
+    // Add more tests for addBet as per the test summary
+    it('should throw an error for invalid currency', async () => {
+      const betData = { playerId: 'player1', username: 'user1', usdAmount: 10, cryptoAmount: 0.01, currency: 'usd', priceAtTime: 1000 };
+      await expect(gameRound.addBet(betData)).to.be.rejectedWith(mongoose.Error.ValidationError);
+    });
+
+    it('should throw an error for missing required fields', async () => {
+      const betData = { playerId: 'player1', username: 'user1', cryptoAmount: 0.01, currency: 'btc', priceAtTime: 1000 };
+      await expect(gameRound.addBet(betData)).to.be.rejectedWith(mongoose.Error.ValidationError);
+    });
+  });
+
+
+  describe('processCashout', () => {
+    it('should process a valid cashout', async () => {
+      const betData = { playerId: 'player1', username: 'user1', usdAmount: 10, cryptoAmount: 0.01, currency: 'btc', priceAtTime: 1000 };
+      await gameRound.addBet(betData);
+      await gameRound.processCashout('player1', 2);
+      expect(gameRound.bets[0].cashoutMultiplier).to.equal(2);
+      expect(gameRound.totalCashouts).to.equal(20);
+      expect(gameRound.totalWinners).to.equal(1);
+    });
+
+    it('should throw an error for non-existent bet', async () => {
+      await expect(gameRound.processCashout('player1', 2)).to.be.rejectedWith('No active bet found for player');
+    });
+
+    // Add more tests for processCashout as per the test summary
+    it('should throw an error for already cashed-out bet', async () => {
+      const betData = { playerId: 'player1', username: 'user1', usdAmount: 10, cryptoAmount: 0.01, currency: 'btc', priceAtTime: 1000, cashoutMultiplier: 1 };
+      await gameRound.addBet(betData);
+      await expect(gameRound.processCashout('player1', 2)).to.be.rejectedWith('No active bet found for player');
+    });
+
+    it('should handle cashout with zero multiplier', async () => {
+      const betData = { playerId: 'player1', username: 'user1', usdAmount: 10, cryptoAmount: 0.01, currency: 'btc', priceAtTime: 1000 };
+      await gameRound.addBet(betData);
+      await gameRound.processCashout('player1', 0);
+      expect(gameRound.bets[0].cashoutMultiplier).to.equal(0);
+      expect(gameRound.totalCashouts).to.equal(0);
+      expect(gameRound.totalWinners).to.equal(1);
+    });
+  });
+
+  describe('finalizeRound', () => {
+    it('should finalize a round with bets', async () => {
+      const betData = { playerId: 'player1', username: 'user1', usdAmount: 10, cryptoAmount: 0.01, currency: 'btc', priceAtTime: 1000 };
+      await gameRound.addBet(betData);
+      await gameRound.finalizeRound();
+      expect(gameRound.status).to.equal('crashed');
+      expect(gameRound.totalLosers).to.equal(0);
+      expect(gameRound.houseProfit).to.equal(10);
+    });
+
+    it('should finalize a round with no bets', async () => {
+      await gameRound.finalizeRound();
+      expect(gameRound.status).to.equal('crashed');
+      expect(gameRound.totalLosers).to.equal(0);
+      expect(gameRound.houseProfit).to.equal(0);
+    });
+
+    // Add more tests for finalizeRound as per the test summary
+
+  });
+
+  describe('getStatistics', () => {
+    it('should retrieve statistics for a completed round', async () => {
+      await gameRound.finalizeRound();
+      const stats = gameRound.getStatistics();
+      expect(stats.status).to.equal('crashed');
+      expect(stats.totalBets).to.equal(0);
+      expect(stats.totalCashouts).to.equal(0);
+    });
+
+    // Add more tests for getStatistics as per the test summary
+    it('should retrieve statistics for an active round', async () => {
+      const stats = gameRound.getStatistics();
+      expect(stats.status).to.equal('active');
+      expect(stats.totalBets).to.equal(0);
+      expect(stats.totalCashouts).to.equal(0);
+    });
+
+    it('should retrieve statistics for a round with no bets', async () => {
+      const stats = gameRound.getStatistics();
+      expect(stats.totalBets).to.equal(0);
+      expect(stats.totalCashouts).to.equal(0);
+      expect(stats.totalWinners).to.equal(0);
+      expect(stats.totalLosers).to.equal(0);
+      expect(stats.houseProfit).to.equal(0);
+    });
+  });
+
+
+  describe('Integration Tests', () => {
+    it('should test the entire flow: addBet -> processCashout -> finalizeRound', async () => {
+      const betData = { playerId: 'player1', username: 'user1', usdAmount: 10, cryptoAmount: 0.01, currency: 'btc', priceAtTime: 1000 };
+      await gameRound.addBet(betData);
+      await gameRound.processCashout('player1', 2);
+      await gameRound.finalizeRound();
+      expect(gameRound.status).to.equal('crashed');
+      expect(gameRound.totalCashouts).to.equal(20);
+      expect(gameRound.totalWinners).to.equal(1);
+      expect(gameRound.totalLosers).to.equal(0);
+      expect(gameRound.houseProfit).to.equal(-10);
+    });
+
+    // Add more integration tests as per the test summary (data persistence, concurrency, error handling) - these will require a running MongoDB instance.
+  });
+
+
+  describe('Edge Cases', () => {
+    it('should handle extremely large bet amounts', async () => {
+      const largeAmount = Number.MAX_SAFE_INTEGER;
+      const betData = { playerId: 'player1', username: 'user1', usdAmount: largeAmount, cryptoAmount: largeAmount, currency: 'btc', priceAtTime: 1000 };
+      await gameRound.addBet(betData); // This might fail depending on your database schema limits
+      expect(gameRound.totalBets).to.equal(largeAmount);
+    });
+
+    // Add more edge case tests as per the test summary (large number of bets, invalid data types, long seed, large crashPoint, race conditions)
+  });
+});
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