Thoroughly test Roulette UI interactions

KNOWN_BUGS.md

@@ -100,4 +100,47 @@ Submitting multiple transactions in parallel led to inconsistent contract state
 
 ---
 
+### 14.  **Event Listener Memory Leaks** in Multiple Components **(FIXED)**
+```11:16:src/components/roulette/MostRecentSpinResults.js
+rouletteContractEvents.on('ExecutedWager', (playerAddress, wheelNumber) => {
+```
+```17:23:src/components/roulette/SpinResult.js
+rouletteContractEvents.on('ExecutedWager', (playerAddress, wheelNumber) => {
+```
+Event listeners were registered on every render without cleanup, causing memory leaks and duplicate event handling. Fixed by moving listeners to useEffect with proper cleanup functions.
+
+---
+
+### 15.  **Infinite Re-render Loop** in NumbersHitTracker **(FIXED)**
+```11:16:src/components/roulette/NumbersHitTracker.js
+}, [props.playerAddress, currentSet]);
+```
+Component had `currentSet` in dependency array while also updating it, causing infinite loops. Fixed by removing from dependencies and adding proper event-based updates with debouncing.
+
+---
+
+### 16.  **Race Condition** Between Frontend and Blockchain **(FIXED)**
+```107:136:src/components/roulette/Roulette.js
+getRandomWheelNumber(`${Date.now()}${playerAddress}`)
+```
+Frontend generated random numbers locally before blockchain confirmation, creating inconsistent state. Fixed by waiting for blockchain events and using actual blockchain results.
+
+---
+
+### 17.  **Missing Transaction Error Handling** **(FIXED)**
+```90:137:src/components/roulette/Roulette.js
+executeWager(playerAddress).then((response) => {
+```
+No error handling for failed blockchain transactions. Added try-catch blocks and user-friendly error messages.
+
+---
+
+### 18.  **Precision Issues** with ETH Balance Comparisons **(FIXED)**
+```78:82:src/components/roulette/Roulette.js
+if (currentChipAmountSelected > availableBalance) {
+```
+Using parseFloat for ETH values caused precision errors. Fixed by using ethers.js BigNumber for all balance calculations.
+
+---
+
 *(End of file – please update as additional bugs are discovered)*

ROULETTE_BUG_FIXES_SUMMARY.md

@@ -0,0 +1,115 @@
+# Roulette Game Bug Fixes Summary
+
+## Overview
+This document summarizes the bugs found and fixed in the Roulette game's interaction between the UI, service layer, and blockchain.
+
+## Bugs Fixed
+
+### 1. Event Listener Memory Leaks
+**Problem:** Multiple components (`MostRecentSpinResults`, `SpinResult`) were registering event listeners on every render without cleanup, causing memory leaks and duplicate event handling.
+
+**Solution:** 
+- Moved event listener registration to `useEffect` hooks
+- Added cleanup functions to remove listeners on unmount
+- Used functional state updates to avoid stale closures
+
+**Files Modified:**
+- `src/components/roulette/MostRecentSpinResults.js`
+- `src/components/roulette/SpinResult.js`
+
+### 2. Infinite Re-render Loop in NumbersHitTracker
+**Problem:** Component had `currentSet` in its dependency array while also updating it, causing infinite re-renders.
+
+**Solution:**
+- Removed `currentSet` from dependency array
+- Added event-based updates with debouncing
+- Used `useRef` for timer management
+
+**File Modified:**
+- `src/components/roulette/NumbersHitTracker.js`
+
+### 3. Race Condition Between Frontend and Blockchain
+**Problem:** Frontend was generating random numbers locally before blockchain confirmation, creating inconsistent state where UI showed different results than what was recorded on blockchain.
+
+**Solution:**
+- Removed local random number generation
+- Wait for blockchain event (`ExecutedWager`) to get actual result
+- Calculate results based on blockchain data, not predicted values
+
+**File Modified:**
+- `src/components/roulette/Roulette.js`
+
+### 4. Missing Transaction Error Handling
+**Problem:** No error handling for failed blockchain transactions, leaving users confused when transactions failed.
+
+**Solution:**
+- Added try-catch blocks around blockchain calls
+- Added user-friendly error messages
+- Properly reset spinning state on errors
+- Clean up event listeners on error
+
+**File Modified:**
+- `src/components/roulette/Roulette.js`
+
+### 5. Precision Issues with ETH Balance Comparisons
+**Problem:** Using `parseFloat` for ETH values caused precision errors when comparing balances.
+
+**Solution:**
+- Switched to using `ethers.BigNumber` for all balance calculations
+- Used proper Wei conversions with `parseEther`
+- Ensured all comparisons use BigNumber methods
+
+**File Modified:**
+- `src/components/roulette/Roulette.js`
+
+### 6. Transaction Confirmation Not Awaited
+**Problem:** The code wasn't waiting for transaction confirmation, potentially showing success before the transaction was mined.
+
+**Solution:**
+- Added `await tx.wait()` to wait for transaction confirmation
+- Only update UI after confirmation is received
+
+**File Modified:**
+- `src/components/roulette/Roulette.js`
+
+## Tests Created
+
+### 1. Integration Tests (`Roulette.integration.test.js`)
+Comprehensive tests covering:
+- Complete betting workflow
+- Balance validation
+- Blockchain interaction
+- Error handling
+- Event listener cleanup
+- Precision handling with BigNumbers
+
+### 2. Event Listener Tests (`EventListenerComponents.test.js`)
+Tests for components using blockchain events:
+- Event registration and cleanup
+- Proper state updates from events
+- Debouncing behavior
+- Error handling
+
+### 3. Bet Results Tests (`BetResultsCalculation.test.js`)
+Tests for betting logic:
+- Winning calculations for all bet types
+- Multiple bets handling
+- Display of results
+- Special cases (0 and 00)
+
+## Key Improvements
+
+1. **Reliability:** Eliminated race conditions and memory leaks
+2. **Consistency:** UI now always reflects actual blockchain state
+3. **User Experience:** Added proper error handling and feedback
+4. **Precision:** Fixed decimal precision issues with ETH values
+5. **Maintainability:** Added comprehensive test coverage
+
+## Verification Steps
+
+To verify the fixes:
+1. Place bets and spin - results should match blockchain events
+2. Check browser console - no memory leak warnings
+3. Try invalid operations - proper error messages should appear
+4. Check balances - should be precise even with many decimals
+5. Run tests - all should pass

package.json

@@ -40,7 +40,7 @@
     "devDependencies": {
         "@nomicfoundation/hardhat-toolbox": "^2.0.2",
         "@nomiclabs/hardhat-ethers": "^2.2.2",
-        "@testing-library/jest-dom": "^5.16.5",
+        "@testing-library/jest-dom": "^5.17.0",
         "@testing-library/react": "^14.0.0",
         "@testing-library/user-event": "^14.4.3",
         "hardhat": "^2.13.0",

src/components/roulette/ClickableBet.js

@@ -31,7 +31,7 @@ function ClickableBet(props) {
                 </div>
                 <Chip
                     auxiliaryClassName="betting-square-chip"
-                    key={props.chipAmount}
+                    key={props.betAmount}
                     onClick={props.onClick}
                     chipAmount={props.betAmount}
                 />

src/components/roulette/MostRecentSpinResults.js

@@ -8,17 +8,23 @@ const CLASS_NAME = "MostRecentSpinResults-component";
 export function MostRecentSpinResults(props) {
     const [spinResults, setSpinResults] = useState([]);
 
-    rouletteContractEvents.on('ExecutedWager', (playerAddress, wheelNumber) => {
-        if (playerAddress === props.playerAddress) {
-            const copySpinResults = [...spinResults];
-            copySpinResults.push(parseInt(wheelNumber, 10));
-            setSpinResults(copySpinResults.slice(-20)); // Only keep the last 20 results
-        }
-    });
-
     useEffect(() => {
-        // render
-    }, [spinResults, props.playerAddress]);
+        const handleExecutedWager = (playerAddress, wheelNumber) => {
+            if (playerAddress === props.playerAddress) {
+                setSpinResults(prevResults => {
+                    const newResults = [...prevResults, parseInt(wheelNumber, 10)];
+                    return newResults.slice(-20); // Only keep the last 20 results
+                });
+            }
+        };
+
+        rouletteContractEvents.on('ExecutedWager', handleExecutedWager);
+
+        // Cleanup function to remove event listener
+        return () => {
+            rouletteContractEvents.off('ExecutedWager', handleExecutedWager);
+        };
+    }, [props.playerAddress]);
 
     return (
         <div

src/components/roulette/NumbersHitTracker.js

@@ -1,19 +1,50 @@
-import { useEffect, useState } from 'react';
+import { useEffect, useState, useRef } from 'react';
 
 import { WHEEL_NUMBERS } from "../../common/wheelNumbers";
 
-import { getPlayerNumberCompletionSetCurrent } from "../../common/blockchainWrapper";
+import { getPlayerNumberCompletionSetCurrent, rouletteContractEvents } from "../../common/blockchainWrapper";
 
 const CLASS_NAME = "NumbersHitTracker-component";
 export function NumbersHitTracker(props) {
     const [currentSet, setCurrentSet] = useState(new Set());
+    const timerRef = useRef(null);
 
     useEffect(() => {
-        setTimeout(async () => {
-            const currentNumbers = await getPlayerNumberCompletionSetCurrent(props.playerAddress);
-            setCurrentSet(new Set(currentNumbers));
-        }, 1000);
-    }, [props.playerAddress, currentSet]);
+        const fetchCurrentSet = async () => {
+            try {
+                const currentNumbers = await getPlayerNumberCompletionSetCurrent(props.playerAddress);
+                setCurrentSet(new Set(currentNumbers));
+            } catch (error) {
+                console.error("Error fetching current number set:", error);
+            }
+        };
+
+        // Initial fetch
+        fetchCurrentSet();
+
+        // Listen for new spins
+        const handleExecutedWager = (playerAddress, wheelNumber) => {
+            if (playerAddress === props.playerAddress) {
+                // Debounce the fetch to avoid rapid updates
+                if (timerRef.current) {
+                    clearTimeout(timerRef.current);
+                }
+                timerRef.current = setTimeout(() => {
+                    fetchCurrentSet();
+                }, 500);
+            }
+        };
+
+        rouletteContractEvents.on('ExecutedWager', handleExecutedWager);
+
+        // Cleanup
+        return () => {
+            if (timerRef.current) {
+                clearTimeout(timerRef.current);
+            }
+            rouletteContractEvents.off('ExecutedWager', handleExecutedWager);
+        };
+    }, [props.playerAddress]);
 
     return (
         <div